Using Boundary Conditions to Account for Mean Flow Effects in a Zero Mach Number Acoustic Solver

Abstract : The present study is devoted to the modeling of mean flow effects while computing thermoacoustic modes under the zero Mach number assumption. It is first recalled that the acoustic impedance modeling of a compressor or a turbine must be prescribed under an energetical form instead of the classical acoustic variables. Then we demonstrate the feasibility to take into account the coupling between acoustic and entropy waves in a zero Mach number framework to capture a family of low frequency entropic modes. The proposed approach relies on a new delayed entropy coupled boundary condition (DECBC) and proves able to capture a family of low frequency entropic mode even though no mean flow term is included in the fluctuating pressure equation.
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https://hal.archives-ouvertes.fr/hal-00802041
Contributor : Franck Nicoud <>
Submitted on : Monday, March 18, 2013 - 10:14:30 PM
Last modification on : Friday, June 14, 2019 - 6:30:59 PM

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Emmanuel Motheau, Franck Nicoud, Thierry Poinsot. Using Boundary Conditions to Account for Mean Flow Effects in a Zero Mach Number Acoustic Solver. Journal of Engineering for Gas Turbines and Power, American Society of Mechanical Engineers, 2012, 134 (11), pp.111502. ⟨10.1115/1.4007198⟩. ⟨hal-00802041⟩

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