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research-article

Budgets of disturbances energy for nozzle flows at subsonic and choked regimes

[+] Author and Article Information
Maxime Huet

ONERA – The French Aerospace Lab, F-92322, Châtillon, France
maxime.huet@onera.fr

1Corresponding author.

ASME doi:10.1115/1.4038473 History: Received August 02, 2017; Revised August 29, 2017

Abstract

The noise generated by the passage of acoustic and entropy perturbations through subsonic and choked nozzle flows is investigated numerically using an energetic approach. Low-order models are used to reproduce the experimental results of the Hot Acoustic Test rig (HAT) of DLR and energy budgets are performed to characterize the reflection, transmission and dissipation of the fluctuations. Because acoustic and entropy perturbations are present in the flow in the general case, classical acoustic energy budgets cannot be used and the disturbances energy budgets proposed by Myers (J. Fluid Mech. 226 (1991) 383-400) are used instead. Numerical results are in very good agreement with the experiments in terms of acoustic transmission and reflection coefficients. The normal shock present in the diffuser for choked regimes is shown to attenuate the scattered acoustic fluctuations, either by pure dissipation effect or by converting a part of the acoustic energy into entropy fluctuations.

Copyright (c) 2017 by ASME
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