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Numerical investigation of combustion noise: The Entropy Wave Generator

Becerril, César and Moreau, Stéphane and Bauerheim, Michaël and Gicquel, Laurent and Poinsot, Thierry Numerical investigation of combustion noise: The Entropy Wave Generator. (2016) In: 22nd AIAA/CEAS Aeroacoustics Conference, 30 May 2016 - 1 June 2016 (Lyon, France).

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Official URL: http://doi.org/10.2514/6.2016-2830

Abstract

A Large Eddy Simulation of a subsonic operating point (test case number two from Bake et al. [9]) of the EWG is presented in this paper. This study has three goals. The first is to provide a larger database on the generation of indirect noise than the one provided by RANS simulations and analytical models. The second is to determine the dominant noise in the subsonic case (direct or indirect). The third is to understand the reason of the overestimation of the pressure peak noise when the nozzle Mach number increases (i.e. Figure 1). As an explanation to the third phenomenon, Howe [20] suggested firstly that in cases with flow separation in the nozzle diffuser, vortex sound is strongly correlated with entropy noise and can dramatically reduce the overall sound level. Secondly, the strong deformation of the hot slug in the nozzle throat reduces the entropy gradients within the front and rear interfaces of the slug generating a decrease in acoustic pressure.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-02154836
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Centre Européen de Recherche et Formation Avancées en Calcul Scientifique - CERFACS (FRANCE)
Other partners > Institut national des sciences de l'Univers - INSU (FRANCE)
Other partners > Université de Sherbrooke (CANADA)
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Deposited On:12 Jun 2019 13:55

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