Combustion Noise
The reduction of noise emissions is a topic of increasing relevance in the public as well as for the economy. So far, the research has mainly concentrated on aerodynamic noise formation by airplanes, as well as other vehicles. The authors of this book go
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Anna Schwarz · Johannes Janicka Editors
Combustion Noise
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Editors Anna Schwarz Technische Universit¨at Darmstadt Institute for Energy and Powerplant Technology Petersenstr. 30 64287 Darmstadt Germany [email protected]
Prof. Dr.-Ing. Johannes Janicka Technische Universit¨at Darmstadt Institute for Energy and Powerplant Technology Petersenstr. 30 64287 Darmstadt Germany
ISBN 978-3-642-02037-7 e-ISBN 978-3-642-02038-4 DOI 10.1007/978-3-642-02038-4 Springer Dordrecht Heidelberg London New York Library of Congress Control Number: 2009930315 c Springer-Verlag Berlin Heidelberg 2009 This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilm or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer. Violations are liable to prosecution under the German Copyright Law. The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Cover design: eStudio Calamar S.L. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)
Foreword
November, 2008
Anna Schwarz, Johannes Janicka
In the last thirty years noise emission has developed into a topic of increasing importance to society and economy. In fields such as air, road and rail traffic, the control of noise emissions and development of associated noise-reduction technologies is a central requirement for social acceptance and economical competitiveness. The noise emission of combustion systems is a major part of the task of noise reduction. The following aspects motivate research: • Modern combustion chambers in technical combustion systems with low pollution exhausts are 5 - 8 dB louder compared to their predecessors. In the operational state the noise pressure levels achieved can even be 10-15 dB louder. • High capacity torches in the chemical industry are usually placed at ground level because of the reasons of noise emissions instead of being placed at a height suitable for safety and security. • For airplanes the combustion emissions become a more and more important topic. The combustion instability and noise issues are one major obstacle for the introduction of green technologies as lean fuel combustion and premixed burners in aero-engines. The direct and indirect contribution of combustion noise to the overall core noise is still under discussion. However, it is clear that the core noise besides the fan tone will become an important noise source in future aero-engine designs. To further reduce the jet noise, geared
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