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Large Eddy Simulations for Indirect Combustion Noise Assessment in a Nozzle Guide Vane Passage

Ceci, Alessandro and Gojon, Romain and Mihaescu, Mihai Large Eddy Simulations for Indirect Combustion Noise Assessment in a Nozzle Guide Vane Passage. (2018) Flow, Turbulence and Combustion. 1-13. ISSN 1386-6184

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Official URL: http://doi.org/10.1007/s10494-018-9964-9

Abstract

The combustion noise in aero-engines is known to originate from two different sources. First, the unsteady heat release in the combustion chamber generates the direct combustion noise. Second, hot and cold spots of air generated by the combustion process are convected and accelerated by the turbine stages and give rise to the so-called indirect combustion noise. The present work targets, by using a numerical approach, the generation mechanism of indirect combustion noise for a simplified geometry of a turbine stator passage. Periodic temperature fluctuations are imposed at the inlet, permitting to simulate hot and cold packets of air coming from the unsteady combustion. Three-dimensional Large Eddy Simulation (LES) calculations are conducted for transonic operating conditions to evaluate the blade acoustic response to the forced temperature perturbations at the inlet plane. Transonic conditions are characterized by trailing edge expansion waves and shocks. It is notably shown that their movement can be excited if disturbances with a particular frequency are injected in the domain.

Item Type:Article
HAL Id:hal-01881298
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Royal Institute of Technology – KTH (SWEDEN)
Laboratory name:
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Deposited By: Romain GOJON
Deposited On:25 Sep 2018 14:15

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