Comparison of Direct and Indirect Combustion Noise Mechanisms in a Model Combustor

Abstract : Core noise in aeroengines is due to two main mechanisms: direct combustion noise, which is generated by the unsteady expansion of burning gases, and indirect combustion noise, which is due to the acceleration of entropy waves (temperature fluctuations generated by unsteady combustion) within the turbine stages. This paper shows how a simple burner model (a flame in a combustion chamber terminated by a nozzle) can be used to scale direct and indirect noise. An analytical formulation is used for waves generated by combustion. The transmission and generation of waves through the nozzle is calculated using both the analytical results of Marble and Candel (Marble, F. E., and Candel, S., "Acoustic Disturbances from Gas Nonuniformities Convected Through a Nozzle," Journal of Sound and Vibration, Vol. 55, 1977, pp. 225-243.) and a numerical tool. Numerical results for the nozzle verify and extend the analytical approach. The analytical relations for the combustion and the nozzle provide simple scaling laws for direct and indirect noise ratio as a function of the Mach number in the combustion chamber and at the nozzle outlet.
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Matthieu Leyko, Franck Nicoud, Thierry Poinsot. Comparison of Direct and Indirect Combustion Noise Mechanisms in a Model Combustor. AIAA Journal, American Institute of Aeronautics and Astronautics, 2009, 47 (11), pp.2709-2716. ⟨10.2514/1.43729⟩. ⟨hal-00803808⟩

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