Combustion Noise
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Combustion Noise
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Author : Anna Schwarz
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-06-17
Combustion Noise written by Anna Schwarz and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-06-17 with Technology & Engineering categories.
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 ?elds such as air, road and rail traf?c, the control of noise emissions and development of associated noise-reduction techno- gies 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 - duction. The following aspects motivate research: • Modern combustion chambers in technical combustion systems with low pol- tion exhausts are 5 - 8 dB louder compared to their predecessors. In the ope- tional 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 ultra high bypass ratio fans are driven by only a few highly loaded turbine stages.
Combustion Noise
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Author : Warren C. Strahle
language : en
Publisher:
Release Date : 1977
Combustion Noise written by Warren C. Strahle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Airplanes categories.
Noise Control In Internal Combustion Engines
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Author : Darrell E. Petska
language : en
Publisher: John Wiley & Sons
Release Date : 1982-04-16
Noise Control In Internal Combustion Engines written by Darrell E. Petska and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982-04-16 with Technology & Engineering categories.
Provides systematic methodology for investigating, evaluating, and designing controls for noise emanating from internal combustion engines, or from the addition of necessary components, with emphasis on control at the source of the noise. Deals with noise control on a component-by-component basis. Discusses control along the path of propagation, the effects of operating parameters on the noise level that an engine can produce, and silencers as a means of noise control. Assesses damping and isolation treatments, and sets forth a noise and vibration monitoring methodology to meet design goals and quality standards consistently.
A Note On Combustion Noise
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Author : E. J. Richards
language : en
Publisher:
Release Date : 1961
A Note On Combustion Noise written by E. J. Richards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with categories.
Combustion Noise At Elevated Pressures In A Liquid Fueled Premixed Combustor
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Author : Douglas Darling
language : en
Publisher:
Release Date : 1997
Combustion Noise At Elevated Pressures In A Liquid Fueled Premixed Combustor written by Douglas Darling and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Orlando, FL, Jun 2 - Jun 5, 1997.
Separating Direct And Indirect Turbofan Engine Combustion Noise While Estimating Post Combustion Post Flame Residence Time Using The Correlation Fun
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2019-01-13
Separating Direct And Indirect Turbofan Engine Combustion Noise While Estimating Post Combustion Post Flame Residence Time Using The Correlation Fun written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-01-13 with Science categories.
A previous investigation on the presence of direct and indirect combustion noise for a full-scale turbofan engine using a far-field microphone at 130 is extended by also examining signals obtained at two additional downstream directions using far-field microphones at 110 deg and 160 deg. A generalized cross-correlation function technique is used to study the change in propagation time to the far field of the combined direct and indirect combustion noise signal as a sequence of low-pass filters are applied. The filtering procedure used produces no phase distortion. As the low-pass filter frequency is decreased, the travel time increases because the relative amount of direct combustion noise is reduced. The indirect combustion noise signal travels more slowly because in the combustor entropy fluctuations move with the flow velocity, which is slow compared to the local speed of sound. The indirect combustion noise signal travels at acoustic velocities after reaching the turbine and being converted into an acoustic signal. The direct combustion noise is always propagating at acoustic velocities. The results show that the estimated indirect combustion noise time delay values (post-combustion residence times) measured at each angle are fairly consistent with one another for a relevant range of operating conditions and demonstrate source separation of a mixture of direct and indirect combustion noise. The results may lead to a better idea about the acoustics in the combustor and may help develop and validate improved reduced-order physics-based methods for predicting turbofan engine core noise. Miles, Jeffrey Hilton Glenn Research Center WBS 561581.02.08.03.18.03
Separating Direct And Indirect Turbofan Engine Combustion Noise While Estimating Post Combustion Post Flame Residence Time Using The Correlation Function
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-05-22
Separating Direct And Indirect Turbofan Engine Combustion Noise While Estimating Post Combustion Post Flame Residence Time Using The Correlation Function written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-22 with categories.
A previous investigation on the presence of direct and indirect combustion noise for a full-scale turbofan engine using a far-field microphone at 130 is extended by also examining signals obtained at two additional downstream directions using far-field microphones at 110 deg and 160 deg. A generalized cross-correlation function technique is used to study the change in propagation time to the far field of the combined direct and indirect combustion noise signal as a sequence of low-pass filters are applied. The filtering procedure used produces no phase distortion. As the low-pass filter frequency is decreased, the travel time increases because the relative amount of direct combustion noise is reduced. The indirect combustion noise signal travels more slowly because in the combustor entropy fluctuations move with the flow velocity, which is slow compared to the local speed of sound. The indirect combustion noise signal travels at acoustic velocities after reaching the turbine and being converted into an acoustic signal. The direct combustion noise is always propagating at acoustic velocities. The results show that the estimated indirect combustion noise time delay values (post-combustion residence times) measured at each angle are fairly consistent with one another for a relevant range of operating conditions and demonstrate source separation of a mixture of direct and indirect combustion noise. The results may lead to a better idea about the acoustics in the combustor and may help develop and validate improved reduced-order physics-based methods for predicting turbofan engine core noise. Miles, Jeffrey Hilton Glenn Research Center ACOUSTICS; COMBUSTION CHAMBERS; TURBOFAN ENGINES; CROSS CORRELATION; ENGINE TESTS; TIME LAG; DATA ACQUISITION; MICROPHONES; LOW PASS FILTERS; TIME DOMAIN ANALYSIS; COHERENCE; FAR FIELDS
Combustion Engines
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Author : Aman Gupta
language : en
Publisher: John Wiley & Sons
Release Date : 2017-02-03
Combustion Engines written by Aman Gupta and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-03 with Technology & Engineering categories.
Vehicle noise, vibration, and emissions are only a few of the factors that can have a detrimental effects on overall performance of an engine. These aspects are benchmarks for choice of customers while choosing a vehicle or for engineers while choosing an engine for industrial applications. It is important that mechanical and automotive engineers have some knowledge in this area, as a part of their well-rounded training for designing and selecting various types of engines. This volume is a valuable introductory text and a handy reference for any engineer, manager, or technician working in this area. The automotive industry, and other industries that make use of engines in their industrial applications, account for billions, or even trillions, of dollars of revenue worldwide and are important in the daily lives of many, if not most, of the people living on this planet. This is an area that affects a staggering number of people, and the information needed by engineers and technicians concerning the performance of various types of engines is of paramount importance in designing and selecting engines and the processes into which they are introduced.
Separating Direct And Indirect Turbofan Engine Combustion Noise While Estimating Post Combustion Residence Time Using The Correlation Fun
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Author : Jeffrey Hilton Miles
language : en
Publisher: BiblioGov
Release Date : 2013-06
Separating Direct And Indirect Turbofan Engine Combustion Noise While Estimating Post Combustion Residence Time Using The Correlation Fun written by Jeffrey Hilton Miles and has been published by BiblioGov this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06 with categories.
A previous investigation on the presence of direct and indirect combustion noise for a full-scale turbofan engine using a far-field microphone at 130 is extended by also examining signals obtained at two additional downstream directions using far-field microphones at 110 deg and 160 deg. A generalized cross-correlation function technique is used to study the change in propagation time to the far field of the combined direct and indirect combustion noise signal as a sequence of low-pass filters are applied. The filtering procedure used produces no phase distortion. As the low-pass filter frequency is decreased, the travel time increases because the relative amount of direct combustion noise is reduced. The indirect combustion noise signal travels more slowly because in the combustor entropy fluctuations move with the flow velocity, which is slow compared to the local speed of sound. The indirect combustion noise signal travels at acoustic velocities after reaching the turbine and being converted into an acoustic signal. The direct combustion noise is always propagating at acoustic velocities. The results show that the estimated indirect combustion noise time delay values (post-combustion residence times) measured at each angle are fairly consistent with one another for a relevant range of operating conditions and demonstrate source separation of a mixture of direct and indirect combustion noise. The results may lead to a better idea about the acoustics in the combustor and may help develop and validate improved reduced-order physics-based methods for predicting turbofan engine core noise.
Theory Of Combustion Noise
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Author : H. H. Chiu
language : en
Publisher:
Release Date : 1973
Theory Of Combustion Noise written by H. H. Chiu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Combustion categories.
A unified theory of noise generation and amplification by turbulent combustion of premixed fuel and liquid fuel droplets has been developed within the framework of the fluid mechanics of the reacting gas. The overall sound generation processes have been classified in terms of the sound due to an isolated turbulent flame and that due to the interaction of a flame with its environment in a typical combustor. The analysis has been focused on, (1) the far field noise characteristics, and (2) the mechanism of sound generation, dispersion, and transmission in the vicinity of an open flame. The acoustic intensity generated by a turbulent premixed flame is found to be a function of the relevant aerothermochemical parameters and the flame structural factor, expressed in terms of six double correlation functions characterizing the flame structure. (Modified author abstract).