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Books > Science & Mathematics > Physics > Classical mechanics > Sound, vibration & waves (acoustics)
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Combustion Noise (Hardcover, 2009 ed.)
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Combustion Noise (Hardcover, 2009 ed.)
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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.
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