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Elements of Propulsion: Gas Turbines and Rocks.pdf

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77793_fm
Front Matter
Foreword to Second Edition
Foreword to First Edition
Acknowledgements
Preface
Table of Contents
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
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77793_toc
Front Matter
Preface
Nomenclature
Table of Contents
1. Introduction
1.1 Propulsion
1.2 Units and Dimensions
1.3 Operational Envelopes and Standard Atmosphere
1.4 Airbreathing Engines
1.5 Aircraft Performance
1.6 Rocket Engines
Problems
2. Review of Fundamentals
2.1 Introduction
2.2 Equations of State and Conservation of Mass
2.3 Steady Flow Energy Equation
2.4 Steady Flow Entropy Equation
2.5 Steady Flow Momentum Equation
2.6 Perfect Gas
2.7 Compressible Flow Properties
2.8 One-Dimensional Gas Dynamics - Finite Control Volume Analysis and the H-K Diagram
2.9 Nozzle Design and Nozzle Operating Characteristics
2.10 One-Dimensional Gas Dynamics - Differential Control Volume Analysis
2.11 Chemical Reactions
Problems
3. Rocket Propulsion
3.1 Introduction
3.2 Rocket Propulsion Requirements and Capabilities
3.3 Rocket Propulsion Engines
3.4 Types of Rocket Nozzles
3.5 Parameters for Chemical Rockets
Problems
4. Aircraft Gas Turbine Engine
4.1 Introduction
4.2 Thrust Equation
4.3 Note on Propulsive Efficiency
4.4 Gas Turbine Engine Components
4.5 Brayton Cycle
4.6 Aircraft Engine Design
Problems
5. Parametric Cycle Analysis of Ideal Engines
5.1 Introduction
5.2 Notation
5.3 Design Inputs
5.4 Steps of Engine Parametric Cycle Analysis
5.5 Assumptions of Ideal Cycle Analysis
5.6 Ideal Ramjet
5.7 Ideal Turbojet
5.8 Ideal Turbojet with Afterburner
5.9 Ideal Turbofan
5.10 Ideal Turbofan with Optimum Bypass Ratio
5.11 Ideal Turbofan with Optimum Fan Pressure Ratio
5.12 Ideal Pulse Detonation Engine
Problems
6. Component Performance
6.1 Introduction
6.2 Variation in Gas Properties
6.3 Component Performance
6.4 Inlet and Diffuser Pressure Recovery
6.5 Compressor and Turbine Efficiencies
6.6 Burner Efficiency and Pressure Loss
6.7 Exhaust Nozzle Loss
6.8 Mechanical Efficiency of Power Shaft
6.9 Summary of Component Figures of Merit (Constant c_p Values)
6.10 Component Performance with Variable c_p
Problems
7. Parametric Cycle Analysis of Real Engines
7.1 Introduction
7.2 Turbojet
7.3 Turbojet with Afterburner
7.4 Turbofan - Separate Exhaust Streams
Problems
8. Engine Performance Analysis
8.1 Introduction
8.2 Gas Generator
8.3 Turbojet Engine
8.4 Turbojet Engine with Afterbuming
8.5 Turbofan Engine - Separate Exhausts and Convergent Nozzles
Problems
9. Turbomachinery
9.1 Introduction
9.2 Euler's Turbomachinery Equations
9.3 Axial-Flow Compressor Analysis
9.4 Centrifugal-Flow Compressor Analysis
9.5 Axial-Flow Turbine Analysis
9.6 Centrifugal-Flow Turbine Analysis
Problems
10. Inlets, Nozzles, and Combustion Systems
10.1 Introduction to Inlets and Nozzles
10.2 Inlets
10.3 Subsonic Inlets
10.4 Supersonic Inlets
10.5 Exhaust Nozzles
10.6 Introduction to Combustion Systems
10.7 Main Burners
10.8 Afterburners
Problems
Appendix A: Altitude Tables
Appendix B: Gas Turbine Engine Data
Appendix C: Data for Some Liquid-Propellant Rocket Engines
Appendix D: Air and (CH_2)_n Properties at Low Pressure
Appendix E: Turbomachinery Stresses and Materials
Appendix F: About the Software
Appendix G: Answers to Selected Problems
References
Index
A
B
C
D
E
F
G
H
I
J
L
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77793_nom
Front Matter
Nomenclature
Table of Contents
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
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77793_01
Front Matter
Table of Contents
1. Introduction
1.1 Propulsion
1.2 Units and Dimensions
1.3 Operational Envelopes and Standard Atmosphere
1.4 Airbreathing Engines
1.5 Aircraft Performance
1.6 Rocket Engines
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
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77793_02
Front Matter
Table of Contents
2. Review of Fundamentals
2.1 Introduction
2.2 Equations of State and Conservation of Mass
2.3 Steady Flow Energy Equation
2.4 Steady Flow Entropy Equation
2.5 Steady Flow Momentum Equation
2.6 Perfect Gas
2.7 Compressible Flow Properties
2.8 One-Dimensional Gas Dynamics - Finite Control Volume Analysis and the H-K Diagram
2.9 Nozzle Design and Nozzle Operating Characteristics
2.10 One-Dimensional Gas Dynamics - Differential Control Volume Analysis
2.11 Chemical Reactions
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
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77793_03
Front Matter
Table of Contents
3. Rocket Propulsion
3.1 Introduction
3.2 Rocket Propulsion Requirements and Capabilities
3.3 Rocket Propulsion Engines
3.4 Types of Rocket Nozzles
3.5 Parameters for Chemical Rockets
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
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77793_04
Front Matter
Table of Contents
4. Aircraft Gas Turbine Engine
4.1 Introduction
4.2 Thrust Equation
4.3 Note on Propulsive Efficiency
4.4 Gas Turbine Engine Components
4.5 Brayton Cycle
4.6 Aircraft Engine Design
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
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77793_05
Front Matter
Table of Contents
5. Parametric Cycle Analysis of Ideal Engines
5.1 Introduction
5.2 Notation
5.3 Design Inputs
5.4 Steps of Engine Parametric Cycle Analysis
5.5 Assumptions of Ideal Cycle Analysis
5.6 Ideal Ramjet
5.7 Ideal Turbojet
5.8 Ideal Turbojet with Afterburner
5.9 Ideal Turbofan
5.10 Ideal Turbofan with Optimum Bypass Ratio
5.11 Ideal Turbofan with Optimum Fan Pressure Ratio
5.12 Ideal Pulse Detonation Engine
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
Z
77793_06
Front Matter
Table of Contents
6. Component Performance
6.1 Introduction
6.2 Variation in Gas Properties
6.3 Component Performance
6.4 Inlet and Diffuser Pressure Recovery
6.5 Compressor and Turbine Efficiencies
6.6 Burner Efficiency and Pressure Loss
6.7 Exhaust Nozzle Loss
6.8 Mechanical Efficiency of Power Shaft
6.9 Summary of Component Figures of Merit (Constant c_p Values)
6.10 Component Performance with Variable c_p
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
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77793_07
Front Matter
Table of Contents
7. Parametric Cycle Analysis of Real Engines
7.1 Introduction
7.2 Turbojet
7.3 Turbojet with Afterburner
7.4 Turbofan - Separate Exhaust Streams
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
Z
77793_08
Front Matter
Table of Contents
8. Engine Performance Analysis
8.1 Introduction
8.2 Gas Generator
8.3 Turbojet Engine
8.4 Turbojet Engine with Afterbuming
8.5 Turbofan Engine - Separate Exhausts and Convergent Nozzles
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
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77793_09
Front Matter
Table of Contents
9. Turbomachinery
9.1 Introduction
9.2 Euler's Turbomachinery Equations
9.3 Axial-Flow Compressor Analysis
9.4 Centrifugal-Flow Compressor Analysis
9.5 Axial-Flow Turbine Analysis
9.6 Centrifugal-Flow Turbine Analysis
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
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W
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77793_10
Front Matter
Table of Contents
10. Inlets, Nozzles, and Combustion Systems
10.1 Introduction to Inlets and Nozzles
10.2 Inlets
10.3 Subsonic Inlets
10.4 Supersonic Inlets
10.5 Exhaust Nozzles
10.6 Introduction to Combustion Systems
10.7 Main Burners
10.8 Afterburners
Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
Z
77793_app
Front Matter
Table of Contents
Appendix A: Altitude Tables
Appendix B: Gas Turbine Engine Data
Appendix C: Data for Some Liquid-Propellant Rocket Engines
Appendix D: Air and (CH_2)_n Properties at Low Pressure
Appendix E: Turbomachinery Stresses and Materials
Appendix F: About the Software
Appendix G: Answers to Selected Problems
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
T
U
V
W
X
Z
77793_ref
Front Matter
Table of Contents
References
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
S
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77793_indx
Front Matter
Table of Contents
Index
A
B
C
D
E
F
G
H
I
J
L
M
N
O
P
R
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E l e m e n t s o f P r o p u l s i o n : G a s T u r b i n e s a n d R o c k e t s J a c k D . M a t t i n g l y P r o f e s s o r E m e r i t u s D e p a r t m e n t o f M e c h a n i c a l E n g i n e e r i n g S e a t t l e U n i v e r s i t y , S e a t t l e , W a s h i n g t o n F o r e w o r d b y H a n s v o n O h a i n G e r m a n I n v e n t o r o f t h e J e t E n g i n e E D U C A T I O N S E R I E S J o s e p h A . S c h e t z S e r i e s E d i t o r - i n - C h i e f V i r g i n i a P o l y t e c h n i c I n s t i t u t e a n d S t a t e U n i v e r s i t y B l a c k s b u r g , V i r g i n i a P u b l i s h e d b y t h e A m e r i c a n I n s t i t u t e o f A e r o n a u t i c s a n d A s t r o n a u t i c s , I n c . 1 8 0 1 A l e x a n d e r B e l l D r i v e , R e s t o n , V i r g i n i a 2 0 1 9 1 - 4 3 4 4
A m e r i c a n I n s t i t u t e o f A e r o n a u t i c s a n d A s t r o n a u t i c s , I n c . , R e s t o n , V i r g i n i a 1 2 3 4 5 6 7 8 9 1 0 L i b r a r y o f C o n g r e s s C a t a l o g i n g - i n - P u b l i c a t i o n D a t a M a t t i n g l y , J a c k D . E l e m e n t s o f p r o p u l s i o n : g a s t u r b i n e s a n d r o c k e t s / J a c k D . M a t t i n g l y ; f o r e w o r d b y H a n s y o n O h a i n . p . c m . - - ( E d u c a t i o n s e r i e s ) I n c l u d e s b i b l i o g r a p h i c a l r e f e r e n c e s a n d i n d e x . I S B N 1 - 5 6 3 4 7 - 7 7 9 - 3 ( a l k . p a p e r ) 1 . A i r c r a f t g a s - t u r b i n e s . 2 . A i r p l a n e s - - J e t p r o p u l s i o n . 3 . J e t e n g i n e s . 4 . R o c k e t e n g i n e s . I . T i t l e . I I . S e r i e s : A I A A e d u c a t i o n s e r i e s . T L 7 0 9 . M 3 8 8 2 0 0 6 6 2 9 . 1 3 4 ' 3 5 3 - d c 2 2 2 0 0 6 0 1 7 3 6 3 C o p y r i g h t © 2 0 0 6 b y T h e A m e r i c a n I n s t i t u t e o f A e r o n a u t i c s a n d A s t r o n a u t i c s , I n c . A l l r i g h t s r e s e r v e d . P r i n t e d i n t h e U n i t e d S t a t e s . N o p a r t o f t h i s p u b l i c a t i o n m a y b e r e p r o d u c e d , d i s t r i b u t e d , o r t r a n s m i t t e d , i n a n y f o r m o r b y a n y m e a n s , o r s t o r e d i n a d a t a b a s e o r r e t r i e v a l s y s t e m , w i t h o u t t h e p r i o r w r i t t e n p e r m i s s i o n o f t h e p u b l i s h e r . D a t a a n d i n f o r m a t i o n a p p e a r i n g i n t h i s b o o k a r e f o r i n f o r m a t i o n p u r p o s e s o n l y . A I A A i s n o t r e s p o n - s i b l e f o r a n y i n j u r y o r d a m a g e r e s u l t i n g f r o m u s e o r r e l i a n c e , n o r d o e s A I A A w a r r a n t t h a t u s e o r r e l i a n c e w i l l b e f r e e f r o m p r i v a t e l y o w n e d r i g h t s .
I h a v e b e e n b l e s s e d t o s h a r e m y l i f e w i t h S h e i l a , m y b e s t f r i e n d a n d w i f e . S h e h a s b e e n m y i n s p i r a t i o n a n d h e l p e r , a n d t h e o n e w h o s a c r i f i c e d t h e m o s t t o m a k e t h i s w o r k p o s s i b l e . I d e d i c a t e t h i s b o o k a n d t h e a c c o m p a n y i n g s o f t w a r e t o S h e i l a . I w o u l d l i k e t o s h a r e w i t h a l l t h e f o l l o w i n g p a s s a g e I r e c e i v e d f r o m a v e r y c l o s e f r i e n d a b o u t 3 0 y e a r s a g o . T h i s p a s s a g e p r o v i d e s g u i d a n c e a n d f o c u s t o m y l i f e . I h o p e i t c a n b e a s m u c h h e l p t o y o u . F A B R I C O F L I F E I w a n t t o s a y s o m e t h i n g t o a l l o f y o u W h o h a v e b e c o m e a p a r t O f t h e f a b r i c o f m y l i f e T h e c o l o r a n d t e x t u r e W h i c h y o u h a v e b r o u g h t i n t o M y b e i n g H a v e b e c o m e a s o n g A n d I w a n t t o s i n g i t f o r e v e r . T h e r e i s a n e n e r g y i n u s W h i c h m a k e s t h i n g s h a p p e n W h e n t h e p a t h s o f o t h e r p e r s o n s T o u c h o u r s A n d w e h a v e t o b e t h e r e A n d l e t i t h a p p e n . W h e n t h e t i m e o f o u r p a r t i c u l a r s u n s e t c o m e s O u r t h i n g , o u r a c c o m p l i s h m e n t W o n ' t r e a l l y m a t t e r A g r e a t d e a l . B u t t h e c l a r i t y a n d c a r e W i t h w h i c h w e h a v e l o v e d o t h e r s W i l l s p e a k w i t h v i t a l i t y O f t h e g r e a t g i f t o f l i f e W e h a v e b e e n f o r e a c h o t h e r . G r e g o r y N o r b e r t , O . S . B .
A I A A E d u c a t i o n S e r i e s E d i t o r - i n - C h i e f J o s e p h A . S c h e t z V i r g i n i a P o l y t e c h n i c I n s t i t u t e a n d S t a t e U n i v e r s i t y T a k a h i r a A o k i U n i v e r s i t y o f T o k y o E d w a r d W . A s h f o r d K a r e n D . B a r k e r B r a h e C o r p o r a t i o n R o b e r t H . B i s h o p U n i v e r s i t y o f T e x a s a t A u s t i n C l a u d i o B r u n o U n i v e r s i t y o f R o m e A a r o n R . B y e r l e y U . S . A i r F o r c e A c a d e m y R i c h a r d C o l g r e n U n i v e r s i t y o f K a n s a s K a j a l K . G u p t a N A S A D r y d e n F l i g h t R e s e a r c h C e n t e r R i k a r d B . H e s l e h u r s t A u s t r a l i a n D e f e n c e F o r c e A c a d e m y D a v i d K . H o l g e r I o w a S t a t e U n i v e r s i t y E d i t o r i a l B o a r d R a k e s h K . K a p a n i a V i r g i n i a P o l y t e c h n i c I n s t i t u t e a n d S t a t e U n i v e r s i t y B r i a n L a n d r u m U n i v e r s i t y o f A l a b a m a H u n t s v i l l e T i m o t h y C . L i e u w e n G e o r g i a I n s t i t u t e o f T e c h n o l o g y M i c h a e l M o h a g h e g h T h e B o e i n g C o m p a n y C o n r a d E N e w b e r r y N a v a l P o s t g r a d u a t e S c h o o l M a r k A . P r i c e Q u e e n ' s U n i v e r s i t y B e l f a s t J a m e s M . R a n k i n O h i o U n i v e r s i t y D a v i d K . S c h m i d t U n i v e r s i t y o f C o l o r a d o C o l o r a d o S p r i n g s D a v i d M . V a n W i e J o h n s H o p k i n s U n i v e r s i t y
F o r e w o r d t o t h e S e c o n d E d i t i o n W e a r e v e r y p l e a s e d t o p r e s e n t t h e S e c o n d E d i t i o n o f E l e m e n t s o f P r o p u l s i o n : G a s T u r b i n e s a n d R o c k e t s b y J a c k D . M a t t i n g l y . T h e o r i g i n a l e d i t i o n w a s a w e l l - r e c e i v e d , c o m p r e h e n s i v e , a n d i n - d e p t h t r e a t m e n t o f t h e s e i m p o r t a n t t o p i c s . T h i s n e w e d i t i o n h a s u p d a t e d t h e m a t e r i a l a n d e x p a n d e d t h e c o v e r a g e , a n d w e a n t i c i p a t e t h a t i t w i l l b e e q u a l l y w e l l r e c e i v e d . A n i n t e r e s t i n g f e a t u r e o f t h e f i r s t e d i t i o n w a s a v e r y e x t e n s i v e f o r e w o r d b y t h e j e t e n g i n e p i o n e e r , H a n s V o n O h a i n . I n d e e d , i t i s s o e x t e n s i v e a n d c o m p r e h e n s i v e t h a t i t i s m o r e a h i s t o r i c a l o v e r v i e w a n d i n t r o d u c t i o n t h a n a f o r e w o r d . W e d e e m i t s o u s e f u l t h a t i t i s i n c l u d e d i n t h i s e d i t i o n a s w e l l . T h i s S e c o n d E d i t i o n h a s t e n c h a p t e r s , s e v e n a p p e n d i c e s a n d m o r e t h a n 8 5 0 p a g e s . J a c k M a t t i n g l y i s e x t r e m e l y w e l l q u a l i f i e d t o w r i t e t h i s b o o k b e c a u s e o f h i s b r o a d e x p e r t i s e i n t h e a r e a . H i s c o m m a n d o f t h e m a t e r i a l i s e x c e l l e n t , a n d h e i s a b l e t o o r g a n i z e a n d p r e s e n t i t i n a v e r y c l e a r m a n n e r . H e i s s u c h a p r o f i c i e n t a u t h o r t h a t h e i s t h e c o - w i n n e r o f t h e M a r t i n S u m m e r f i e l d B o o k A w a r d f o r a n o t h e r v o l u m e i n t h i s s e r i e s . T h e A I A A E d u c a t i o n S e r i e s a i m s t o c o v e r a v e r y b r o a d r a n g e o f t o p i c s i n t h e g e n e r a l a e r o s p a c e f i e l d , i n c l u d i n g b a s i c t h e o r y , a p p l i c a t i o n s , a n d d e s i g n . A c o m - p l e t e l i s t o f t i t l e s c a n b e f o u n d a t h t t p : / / w w w . a i a a . o r g . T h e p h i l o s o p h y o f t h e s e r i e s i s t o d e v e l o p t e x t b o o k s t h a t c a n b e u s e d i n a u n i v e r s i t y s e t t i n g , i n s t r u c t i o n a l m a t e r i a l s f o r c o n t i n u i n g e d u c a t i o n a n d p r o f e s s i o n a l d e v e l o p m e n t c o u r s e s , a n d a l s o b o o k s t h a t c a n s e r v e a s t h e b a s i s f o r i n d e p e n d e n t s t u d y . S u g g e s t i o n s f o r n e w t o p i c s o r a u t h o r s a r e a l w a y s w e l c o m e . J o s e p h A . S c h e t z E d i t o r - i n - C h i e f A I A A E d u c a t i o n S e r i e s i x
F o r e w o r d t o t h e F i r s t E d i t i o n B a c k g r o u n d T h e f i r s t f l i g h t o f t h e W r i g h t b r o t h e r s i n D e c e m b e r 1 9 0 3 m a r k e d t h e b e g i n n i n g o f t h e m a g n i f i c e n t e v o l u t i o n o f h u m a n - c o n t r o l l e d , p o w e r e d f l i g h t . T h e d r i v i n g f o r c e s o f t h i s e v o l u t i o n a r e t h e e v e r - g r o w i n g d e m a n d s f o r i m p r o v e - m e n t s i n 1 ) F l i g h t p e r f o r m a n c e ( i . e . , g r e a t e r f l i g h t s p e e d , a l t i t u d e , a n d r a n g e a n d b e t t e r m a n e u v e r a b i l i t y ) ; 2 ) C o s t ( i . e . , b e t t e r f u e l e c o n o m y , l o w e r c o s t o f p r o d u c t i o n a n d m a i n t e n a n c e , i n c r e a s e d l i f e t i m e ) ; 3 ) A d v e r s e e n v i r o n m e n t a l e f f e c t s ( i . e . , n o i s e a n d h a r m f u l e x h a u s t g a s e f f e c t s ) ; 4 ) S a f e t y , r e l i a b i l i t y , a n d e n d u r a n c e ; a n d 5 ) C o n t r o l s a n d n a v i g a t i o n . T h e s e s t r o n g d e m a n d s c o n t i n u o u s l y f u r t h e r e d t h e e f f o r t s o f a d v a n c i n g t h e a i r c r a f t s y s t e m . T h e t i g h t i n t e r d e p e n d e n c y b e t w e e n t h e p e r f o r m a n c e c h a r a c t e r i s t i c s o f a e r o v e - h i c l e a n d a e r o p r o p u l s i o n s y s t e m s p l a y s a v e r y i m p o r t a n t r o l e i n t h i s e v o l u t i o n . T h e r e f o r e , t o g a i n b e t t e r i n s i g h t i n t o t h e e v o l u t i o n o f t h e a e r o p r o p u l s i o n s y s t e m , o n e h a s t o b e a w a r e o f t h e c h a l l e n g e s a n d a d v a n c e m e n t s o f a e r o v e h i c l e t e c h n o l o g y . T h e A e r o v e h i c l e A b r i e f r e v i e w o f t h e e v o l u t i o n o f t h e a e r o v e h i c l e w i l l b e g i v e n f i r s t . O n e c a n o b s e r v e a c o n t i n u o u s t r e n d t o w a r d s t r o n g e r a n d l i g h t e r a i r f r a m e d e s i g n s , s t r u c t u r e s , a n d m a t e r i a l s - - f r o m w o o d a n d f a b r i c t o a l l - m e t a l s t r u c t u r e s ; t o l i g h t e r , s t r o n g e r , a n d m o r e h e a t - r e s i s t a n t m a t e r i a l s ; a n d f i n a l l y t o a g r o w i n g u s e o f s t r o n g a n d l i g h t c o m p o s i t e m a t e r i a l s . A t t h e s a m e t i m e , t h e a e r o d y n a m i c q u a l i t y o f t h e a e r o v e h i c l e i s b e i n g c o n t i n u o u s l y i m p r o v e d . T o s e e t h i s d e v e l o p m e n t i n p r o p e r h i s t o r i c a l p e r s p e c t i v e , l e t u s k e e p i n m i n d t h e f o l l o w i n g i n f o r m a t i o n . I n t h e e a r l y y e a r s o f t h e 2 0 t h c e n t u r y , t h e s c i e n c e o f a e r o d y n a m i c s w a s i n i t s i n f a n c y . S p e c i f i c a l l y , t h e a e r o d y n a m i c l i f t w a s n o t s c i e n t i f i c a l l y w e l l u n d e r s t o o d . J o u k o w s k i a n d K u t t a ' s m o d e l o f l i f t b y c i r c u l a t i o n a r o u n d t h e w i n g a n d P r a n d t l ' s b o u n d a r y - l a y e r a n d t u r b u l e n c e t h e o r i e s w e r e i n t h e i r i n c i p i e n t s t a g e s . T h e r e f o r e , t h e e a r l y p i o n e e r s c o u l d n o t b e n e f i t f r o m e x i s t e n t X V
x v i F O R E W O R D 5 0 4 0 . 3 0 2 O D A l b a t r o s s D V u l t u r e 1 0 D B a t L i l i e n t h a l O / T R A N S O 2 1 S . . . . . / f , J 7 7 4 7 j D c 3 f " 7 o p E R s o N i c S U B S O N I C ~ c r . . . . . . . . ~ - - - _ _ S p i r i t o f S t . L o u i s ~ B " " 1 ~ - - o e i n g W r i g h t J u n k e r s J l S S T F l y e r B - 5 8 I i I I ~ I I i I 1 9 0 0 1 9 1 0 1 9 2 0 1 9 3 0 1 9 4 0 1 9 5 0 1 9 6 0 1 9 7 0 1 9 8 0 1 9 9 0 F i g . 1 P r o g r e s s i n l i f t / d r a g r a t i o L I D . s c i e n t i f i c k n o w l e d g e i n a e r o d y n a m i c s a n d h a d t o c o n d u c t t h e i r o w n f u n d a m e n t a l i n v e s t i g a t i o n s . T h e m o s t d e s i r a b l e m a j o r a e r o d y n a m i c c h a r a c t e r i s t i c s o f t h e a e r o v e h i c l e a r e a l o w d r a g c o e f f i c i e n t a s w e l l a s a h i g h l i f t / d r a g r a t i o L I D f o r c r u i s e c o n d i t i o n s , a n d a h i g h m a x i m u m l i f t c o e f f i c i e n t f o r l a n d i n g . I n F i g . 1 , o n e c a n s e e t h a t t h e w o r l d ' s f i r s t s u c c e s s f u l g l i d e r v e h i c l e b y L i l i e n t h a l , i n t h e e a r l y 1 8 9 0 s , h a d a n L I D o f a b o u t 5 . I n c o m p a r i s o n , b i r d s h a v e a n L I D r a n g i n g f r o m a b o u t 5 t o 2 0 . T h e W r i g h t b r o t h e r s ' f i r s t h u m a n - c o n t r o l l e d , p o w e r e d a i r c r a f t h a d a n L I D o f a b o u t 7 . 5 . A s t h e L I D v a l u e s i n c r e a s e d o v e r t h e y e a r s , s a i l p l a n e s a d v a n c e d m o s t r a p i d l y a n d n o w a r e a t t a i n i n g t h e e n o r m o u s l y h i g h v a l u e s o f a b o u t 5 0 a n d g r e a t e r . T h i s w a s a c h i e v e d b y e m p l o y i n g u l t r a h i g h w i n g a s p e c t r a t i o s a n d a e r o d y n a m i c p r o f i l e s e s p e c i a l l y t a i l o r e d f o r t h e l o w o p e r a t i o n a l R e y n o l d s a n d M a c h n u m b e r s . I n t h e l a t e 1 9 4 0 s , s u b s o n i c t r a n s p o r t a i r c r a f t a d v a n c e d t o L I D v a l u e s o f a b o u t 2 0 b y c o n t i n u o u s l y i m p r o v i n g t h e a e r o d y n a m i c s h a p e s , e m p l o y i n g a d v a n c e d p r o f i l e s , a c h i e v i n g e x t r e m e l y s m o o t h a n d a c c u r a t e s u r f a c e s , a n d i n c o r p o r a t i n g i n v e n t i o n s s u c h a s t h e e n g i n e c o w l a n d t h e r e t r a c t a b l e l a n d i n g g e a r . T h e c o n t i n u o u s i n c r e a s e i n f l i g h t s p e e d r e q u i r e d a c o r r e s p o n d i n g r e d u c t i o n o f t h e l a n d i n g s p e e d / c r u i s e s p e e d r a t i o . T h i s w a s a c c o m p l i s h e d b y i n n o v a t i v e w i n g s t r u c t u r e s i n c o r p o r a t i n g w i n g s l o t s a n d w i n g f l a p s t h a t , d u r i n g t h e l a n d i n g p r o c e s s , e n l a r g e d t h e w i n g a r e a a n d i n c r e a s e d s i g n i f i c a n t l y t h e l i f t c o e f f i - c i e n t . T o d a y , t h e a r r o w h e a d - s h a p e d w i n g c o n t r i b u t e s t o a h i g h l i f t f o r l a n d i n g ( v o r t e x l i f t ) . A l s o , i n t h e 1 9 4 0 s , w o r k b e g a n t o e x t e n d t h e h i g h L I D v a l u e f r o m t h e s u b s o n i c t o t h e t r a n s o n i c f l i g h t s p e e d r e g i m e b y e m p l o y i n g t h e s w e p t - b a c k w i n g a n d l a t e r , i n 1 9 5 2 , t h e a r e a r u l e o f W h i t c o m b t o r e d u c e t r a n s o n i c d r a g r i s e . D r . T h e o d o r e v o n K f i r m f i n d e s c r i b e s i n h i s m e m o i r s , T h e W i n d a n d
F O R E W O R D x v i i B e y o n d , * h o w t h e s w e p t - b a c k w i n g o r s i m p l y s w e p t w i n g f o r t r a n s o n i c a n d s u p e r s o n i c f l i g h t c a m e i n t o e x i s t e n c e : T h e f i f t h V o l t a C o n g r e s s i n R o m e , 1 9 3 5 , w a s t h e f i r s t s e r i o u s i n t e r n a t i o n a l s c i e n t i f i c c o n g r e s s d e v o t e d t o t h e p o s s i b i l i t i e s o f s u p e r s o n i c f l i g h t . I w a s o n e o f t h o s e w h o h a d r e c e i v e d a f o r m a l i n v i t a t i o n t o g i v e a p a p e r a t t h e c o n f e r e n c e f r o m I t a l y ' s g r e a t G u g l i e m o M a r c o n i , i n v e n t o r o f t h e w i r e l e s s t e l e g r a p h . A l l o f t h e w o r l d ' s l e a d i n g a e r o d y n a m i c i s t s w e r e i n v i t e d . T h i s m e e t i n g w a s h i s t o r i c b e c a u s e i t m a r k e d t h e b e g i n n i n g o f t h e s u p e r s o n i c a g e . I t w a s t h e b e g i n n i n g i n t h e s e n s e t h a t t h e c o n f e r e n c e o p e n e d t h e d o o r t o s u p e r s o n i c s a s a m e a n i n g f u l s t u d y i n c o n n e c t i o n w i t h s u p e r s o n i c f l i g h t , a n d , s e c o n d l y , b e c a u s e m o s t d e v e l o p m e n t s i n s u p e r s o n i c s o c c u r r e d r a p i d l y f r o m t h e n o n , c u l m i n a t i n g i n 1 9 4 6 - - a m e r e 1 1 y e a r s l a t e r - - i n C a p t a i n C h a r l e s Y e a g e r ' s p i e r c i n g t h e s o u n d b a r r i e r w i t h t h e X - 1 p l a n e i n l e v e l f l i g h t . I n t e r m s o f f u t u r e a i r c r a f t d e v e l o p m e n t , t h e m o s t s i g n i f i c a n t p a p e r a t t h e c o n f e r e n c e p r o v e d t o b e o n e g i v e n b y a y o u n g m a n , D r . A d o l f B u s e m a n n o f G e r m a n y , b y f i r s t p u b l i c l y s u g g e s t i n g t h e s w e p t - b a c k w i n g a n d s h o w i n g h o w i t s p r o p e r t i e s m i g h t s o l v e m a n y a e r o d y n a m i c p r o b l e m s a t s p e e d s j u s t b e l o w a n d a b o v e t h e s p e e d o f s o u n d . T h r o u g h t h e s e i n v e s t i g a t i o n s , t h e m y t h t h a t s o n i c s p e e d i s t h e f u n d a m e n t a l l i m i t o f a i r c r a f t f l i g h t v e l o c i t y , t h e s o u n d b a r r i e r w a s o v e r c o m e . I n t h e l a t e 1 9 6 0 s , t h e B o e i n g 7 4 7 w i t h s w e p t - b a c k w i n g s h a d , i n t r a n s o n i c c r u i s e s p e e d , a n L I D v a l u e o f n e a r l y 2 0 . I n t h e s u p e r s o n i c f l i g h t s p e e d r e g i m e , L I D v a l u e s i m p r o v e d f r o m 5 i n t h e m i d - 1 9 5 0 s ( s u c h a s L I D v a l u e s o f t h e B - 5 8 H u s t l e r a n d l a t e r o f t h e C o n c o r d e ) t o a p o s s i b l e L I D v a l u e o f 1 0 a n d g r e a t e r i n t h e 1 9 9 0 s . T h i s g r e a t i m p r o v e m e n t p o s s i b i l i t y i n t h e a e r o d y n a m i c s o f s u p e r s o n i c a i r c r a f t c a n b e a t t r i b u t e d t o a p p l i c a t i o n s o f a r t i f i c i a l s t a b i l i t y , t o t h e a r e a r u l e , a n d t o a d v a n c e d w i n g p r o f i l e s h a p e s t h a t e x t e n d l a m i n a r f l o w o v e r a l a r g e r w i n g p o r t i o n . T h e h y p e r s o n i c s p e e d r e g i m e i s n o t f u l l y e x p l o r e d . F i r s t , e m p h a s i s w a s p l a c e d o n w i n g e d r e e n t r y v e h i c l e s a n d l i f t i n g b o d i e s w h e r e a h i g h L I D v a l u e w a s n o t o f g r e a t e s t i m p o r t a n c e . L a t e r i n v e s t i g a t i o n s h a v e s h o w n t h a t t h e L I D v a l u e s c a n b e g r e a t l y i m p r o v e d . F o r e x a m p l e , t h e m a x i m u m L I D f o r a " w a v e r i d e r " i s a b o u t 6 . * S u c h i n v e s t i g a t i o n s a r e o f i m p o r t a n c e f o r h y p e r s o n i c p r o g r a m s . T h e A e r o p r o p u l s i o n S y s t e m A t t h e b e g i n n i n g o f t h i s c e n t u r y , s t e a m a n d i n t e r n a l c o m b u s t i o n e n g i n e s w e r e i n e x i s t e n c e b u t w e r e f a r t o o h e a v y f o r f l i g h t a p p l i c a t i o n . T h e W r i g h t b r o t h e r s r e c o g n i z e d t h e g r e a t f u t u r e p o t e n t i a l o f t h e i n t e r n a l c o m b u s t i o n e n g i n e a n d d e v e l - o p e d b o t h a r e l a t i v e l y l i g h t w e i g h t e n g i n e s u i t a b l e f o r f l i g h t a p p l i c a t i o n a n d a n e f f i c i e n t p r o p e l l e r . F i g u r e 2 s h o w s t h e p r o g r e s s o f t h e p r o p u l s i o n s y s t e m s o v e r t h e y e a r s . T h e W r i g h t b r o t h e r s ' f i r s t a e r o p r o p u l s i o n s y s t e m h a d a s h a f t p o w e r o f 1 2 h p , a n d i t s p o w e r / w e i g h t r a t i o ( r a t i o o f p o w e r o u t p u t t o t o t a l p r o p u l s i o n s y s t e m w e i g h t , i n c l u d i n g p r o p e l l e r a n d t r a n s m i s s i o n ) w a s a b o u t 0 . 0 5 h p / l b . * V o n K ~ i r r n ~ n , T . , T h e W i n d a n d B e y o n d , L i t t l e , B r o w n , B o s t o n , 1 9 6 7 . * H e i s e r , W . H . , a n d P r a t t , D . J . , H y p e r s o n i c A i r b r e a t h i n g P r o p u l s i o n , A I A A E d u c a t i o n S e r i e s , A I A A , W a s h i n g t o n , D C , 1 9 9 4 .
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