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Shock-cell noise of supersonic underexpanded jets

Pérez-Arroyo, Carlos and Daviller, Guillaume and Puigt, Guillaume and Airiau, Christophe Shock-cell noise of supersonic underexpanded jets. (2015) In: 50th 3AF International Conference on Applied Aerodynamics, 29 March 2015 - 1 April 2015 (Toulouse, France).

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Official URL: https://www.academia.edu/28084137

Abstract

Shock-cell noise is a particular noise that appears in imperfectly expanded jets. Under these expansion conditions a series of expansions and compressions appear following a shock-cell type structure. The interaction between the vortices developed at the lip of the nozzle and the shock-cells generates what is known as shock-cell noise. This noise has the particularity to be propagated upstream with a higher intensity. This publication will focus on the shock-cell noise generated by an axisymmetric under-expanded 10 to the power of 6 Reynolds single jet. The LES computations are carried out using the elsA code developed by ONERA and extended by CERFACS with high-order compact schemes. They are validated against experimental results. The LES simulation is initialized with a RANS solution where the nozzle exit conditions are imposed. Even though no inflow forcing is applied, good agreement is obtained in terms of flow structures and broadband shock-cell noise that is propagated to the farfield by means of the Ffowcs-Williams & Hawkings analogy.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-02088791
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)
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Deposited On:03 Apr 2019 08:49

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