Intake Aerodynamics.pdf

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cover next page > title: author: publisher: isbn10 | asin: print isbn13: ebook isbn13: language: subject publication date: lcc: ddc: subject: Intake Aerodynamics Shedon, J. Blackwell Publishing Ltd. 0632049634 9780632049639 9780632061624 English Jet engines--Air intakes--Design and construction, Gas dynamics. 1999 TL709.5.I5I58 1999eb 629.134/353 Jet engines--Air intakes--Design and construction, Gas dynamics. cover next page >

< previous page page_i next page > Page i Intake Aerodynamics Second Edition J. Seddon PhD, DSc, CEng, CFF, FRAeS E.L. Goldsmith MSc(Eng), DIC, CEng, FRAeS revised by E.L. Goldsmith < previous page page_i next page >

< previous page page_ii next page > Page ii © E.L. Goldsmith and the estate of J. Seddon 1985, 1999 Blackwell Science Ltd Editorial Offices: Osney Mead, Oxford OX2 0EL 25 John Street, London WC1N 2BL 23 Ainslie Place, Edinburgh EH3 6AJ 350 Main Street, Malden MA 02148 5018, USA 54 University Street, Carlton Victoria 3053, Australia 10, rue Casimir Delavigne 75006 Paris, France Other Editorial Offices: Blackwell Wissenschafts-Verlag GmbH Kurfürstendamm 57 10707 Berlin, Germany Blackwell Science KK MG Kodenmacho Building 7 10 Kodenmacho Nihombashi Chuo-ku, Tokyo 104, Japan The right of the Author to be identified as the Author of this Work has been asserted in accordance with the Copyright, Designs and Patents Act 1988. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, except as permitted by the UK Copyright, Designs and Patents Act 1988, without the prior permission of the publisher. First published 1985 Second edition 1999 Set in 10/13 pt Times by DP Photosetting, Aylesbury, Bucks Printed and bound in the United Kingdom by MPG Books Ltd, Bodmin, Cornwall The Blackwell Science logo is a trade mark of Blackwell Science Ltd, registered at the United Kingdom Trade Marks Registry DISTRIBUTORS Marston Book Services Ltd PO Box 269 Abingdon Oxon OX14 4YN (Orders: Tel: 01235 465500 Fax: 01235 465555) USA Blackwell Science, Inc. Commerce Place 350 Main Street Malden, MA 02148 5018 (Orders: Tel: 800 759 6102 781 388 8250

Fax: 781 388 8255) Canada Login Brothers Book Company 324 Saulteaux Crescent Winnipeg, Manitoba R3J 3T2 (Orders: Tel: 204 837 2987 Fax: 204 837 3116) Australia Blackwell Science Pty Ltd 54 University Street Carlton, Victoria 3053 (Orders: Tel: 03 9347 0300 Fax: 03 9347 5001) A catalogue record for this title is available from the British Library ISBN 0 632 04963 4 Library of Congress Cataloging-in-Publication data is available For further information on Blackwell Science, visit our website: www.blackwell-science.com < previous page page_ii next page >

< previous page page_iii next page > Page iii Contents Foreword to the First Edition Preface Acknowledgements Notation List List of Abbreviations Chapter 1: Introduction 1.1 Useful Flow Relationships 1.2 Incompressible Flow 1.3 Momentum Theorem 1.4 The Aerodynamic Duct Concept 1.5 Flow Quantity through an Aerodynamic Duct 1.6 Intake Pressure Recovery 1.7 Intake Drag: Compromise in Design Chapter 2: Pressure Recovery of Subsonic Intakes 2.1 Introduction 2.2 Collected Data 2.3 Approximate Theory of Friction Loss ix xi xiv xv xxiii 1 1 3 4 5 6 9 12 16 16 18 19 23

2.4 Examination of µ3 Variation 2.5 Pressure Recovery Characteristics 2.6 Plenum Chambers 2.7 Propeller Turbines 2.8 Flow Stability in Twin Intakes 2.9 Helicopter Intakes Chapter 3: Transonic Effects in Pre-Entry Flow 3.1 First Expectations 3.2 Experiments of Davis et al. 3.3 The Real Nature of Pre-Entry Flow 3.4 Pressure Coefficient at Separation 26 29 32 35 37 41 41 43 44 45 51 3.5 Effect of Separation On Intake Pressure Recovery < previous page page_iii next page >

< previous page page_iv next page > Page iv 3.6 Basics of Normal Shock and Turbulent Boundary-Layer Interaction 3.7 Effect of Bifurcated Shock On Intake Performance Chapter 4: Lip Separation and Transonic Throat Flow 4.1 Introduction 4.2 The Subsonic Diffuser 4.3 Combination of Intake and Subsonic Diffuser 4.4 Methods of Calculation of Total Pressure Loss with Attached Flow at Entry 4.4.1 Straight Ducts 4.4.2 S-Bend Ducts 4.5 Influence of Factors Other Than Contraction Ratio 4.6 Total Pressure Loss with Separated Flow at Entry 4.6.1 Special Conditions with Separated Flow 4.7 Static Loss in Practical Intakes Chapter 5: External Supersonic Compression 5.1 Pitot Intake 5.2 Two-Shock Intakes 56 61 66 66 67 71 76 78 83 83 88 93 98 103 103 106

5.3 Multi-Shock Intakes 5.4 Isentropic Compression 5.5 Limits of External Compression 5.5.1 External Shock Attachment with No Duct Angling 5.5.2 Internal Shock Attachment 5.5.3 Shock Structure 5.6 Intakes A and B 5.7 Position of Normal Shock in Subcritical Operation 5.7.1 Pitot Intake 5.7.2 Two-Shock Intakes 5.8 Calculation of Subcritical Pressure Recovery Chapter 6: Internal Supersonic Compression 6.1 The Flow Starting Problem 6.2 Limiting Contraction Ratio 6.3 Perforated Intake 6.4 Variable Geometry for Flow Starting 6.5 Types of Intake and Limiting Pressure Recovery 112 116 118 119 120 123 124 126 127 131 132 136 136 137 139 140 141

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