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Invesitgation of combustion noise in aero-engines using Large-Eddy Simulation

Leyko, Matthieu. Invesitgation of combustion noise in aero-engines using Large-Eddy Simulation. PhD, Institut National Polytechnique de Toulouse, 2010

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Official URL: http://ethesis.inp-toulouse.fr/archive/00001222/

Abstract

An important part of the noise generated by aero-engines is caused by the combustion. To decrease this source of noise, a precise comprehension of the underlying phenomenon is required. Two different mechanisms generating noise in aero-engines because of the combustion have been identified in the 1970’s: the direct mechanism that is directly related to the unsteady heat release, and the indirect one that is caused by the interactions between the turbine stages and the temperature fluctuations also produced by the combustion. Analytical methods and numerical simulations are used here both to show the importance of the indirect combustion noise compared with the direct one, and to provide some validity limits of compact nozzles analytical approaches. Three different configurations dealing with indirect noise are investigated: quasi-1- D nozzle, axisymmetric 2-D nozzle and 2-D turbine blade. Finally, an actual 3-D combustion chamber sector (SNECMA) is addressed with Large-Eddy Simulation. Fluctuations at the outlet of the combustor are used to compute the overall noise caused by the combustion (direct and indirect), by means of the investigated analytical models.

Item Type:PhD Thesis
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
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Research Director:
Poinsot, Thierry and Nicoud, Franck
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Deposited On:02 Jun 2015 21:57

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