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Showing 1 to 5 of 5 for “"Indirect noise"”.
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Indirect noise in non-isentropic flows
… the nozzle downstream of the combustor generates indirect combustion noise. Indirect noise is a large contributor to aircraft engine noise, therefore, it is an important aspect of the design of an aircraft engine. It is essential to model indirect noise because it can add to the thermoacoustic …
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Sound produced by entropic and compositional inhomogeneities
Combustion noise is central to several efforts to curb aircraft emissions. Indeed, acoustic waves originating in the combustor are a major contributor to aircraft noise. Moreover, they can act as a trigger for thermoacoustic instabilities, the consequences of which may range from decreased …
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On entropic and compositional sound and its sources
Combustion noise is relevant to current aviation, rocket, and ground-based gas turbine engines, as it contributes to environmental noise pollution and can trigger thermoacoustic instabilities. These consequences are particularly prevalent in lean, premixed, prevaporised combustors, which are …
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Behaviour of accelerating entropy spots
Combustion noise has become a major research interest within the aerospace community. Stricter pollutant emission regulations have forced the introduction of lean premixed pre-vaporised combustors, which produce less NOx but burn more unsteadily, generating more noise and creating the potential for …
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Scattering of an entropy disturbance into sound by a linear cascade of turbine stator blades
… known that modern turbofan engines produce more noise from their exhaust than can be accounted for by jet noise alone. Part of the extra noise coming from the exhaust of the engine is associated with the combustor. Apart from direct combustion noise, the combustor is known to have an indirect …