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Journal ArticleDOI

Shock Oscillations in Diffuser Modeled by a Selective Noise Amplification

Jean-Christophe Robinet, +1 more
- 01 Jan 1999 - 
- Vol. 37, Iss: 4, pp 453-459
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TLDR
In this paper, a quasi-one-dimensional stability analysis of self-sustained shock oscillations in transonic diffuser flows is presented, where the mean flow is calculated with a code solving the averaged Navier-Stokes equations.
Abstract: 
Shock waves in supersonic flow oscillate under certain conditions. These oscillations usually have negative effects, especially for flow past transonic airfoils and in supersonic diffusers. It is therefore of practical importance to understand the origin and the consequences of these oscillations. We model and predict some physical characteristics of self-sustained shock oscillations in transonic diffuser flows. We first give the results of a quasi-one-dimensional stability analysis. The mean flow is calculated with a code solving the averaged Navier-Stokes equations. The present stability approach however is limited to the core region where the viscous effects can be neglected

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Citations
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Journal ArticleDOI

Unsteadiness in shock wave boundary layer interactions with separation

Jean-Paul Dussauge, +2 more
- 01 Mar 2006 - 
TL;DR: In this paper, it is suggested from experimental results that the three-dimensional structure of the separated bubble may be at the origin of the unsteadiness of the shock system, while the frequency of the fluctuations produced by the shock motion are much lower than the characteristic frequencies of turbulence in the incoming boundary layers.
Journal ArticleDOI

Some physical aspects of shock wave/boundary layer interactions

Jean Délery, +1 more
- 26 Jul 2009 - 
TL;DR: In this article, the authors present basic and well-established results on the physics of SWBLI corresponding to a description in terms of an average two-dimensional steady flow, and some emphasis is placed on unsteadiness, which constitutes a salient feature of this phenomenon.
Journal ArticleDOI

Pseudo-shock waves and their interactions in high-speed intakes

F. Gnani, +2 more
- 01 Apr 2016 - 
TL;DR: In this article, the main results on the shock train structure and its associated phenomena inside isolators, studied using the aforementioned tools are brought together, and several promising flow control techniques that have more recently been applied to manipulate the shock wave/boundary layer interaction are also examined.
Journal ArticleDOI

Interactions Between Shock and Acoustic Waves in a Supersonic Inlet Diffuser

Jong Y. Oh, +4 more
- 01 May 2005 - 
TL;DR: In this paper, the effects of externally imposed pressure oscillations at the diffuser exit over a wide range of forcing frequencies and amplitudes are investigated numerically by means of a finite-volume approach using a four-stage Runge-Kutta scheme for temporal derivatives and the Harten-Yee upwind total-variation-diminishing scheme for spatial terms.
Journal ArticleDOI

Mechanism of Shock Wave Oscillation in Transonic Diffusers

Taro Handa, +2 more
- 01 Jan 2003 - 
TL;DR: In this paper, the authors investigated the self-excited shock wave oscillation in a two-dimensional transonic diffuser and found that a pressure disturbance is generated near the stem of the shock wave and is convected in the downstream direction.
References
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Journal ArticleDOI

Characteristic frequencies of transonic diffuser flow oscillations

T. J. Bogar, +2 more
- 01 Sep 1983 - 
TL;DR: In this paper, the distribution de densite spectrale de puissance du mouvement de choc instationnaire presente trois pics distincts, suivant les conditions d'ecoulement.
Journal ArticleDOI

The response of normal shocks in diffusers

Fred E. C. Culick, +1 more
- 01 Oct 1983 - 
TL;DR: In this paper, the frequency response of a normal shock in a diverging channel is calculated for application to problems of pressure oscillations in ramjet engines, and two limits of a linearized analysis arc are discussed: one represents isentropic flow on both sides of a shock wave; the other may be a crude estimate to the influence of flow separation induced by the wave.
Proceedings ArticleDOI

Downstream boundary effects on the frequency of self-excited oscillations in transonic diffuser flows

T. Hsieh, +1 more
TL;DR: In this article, the authors investigated the downstream boundary effects on the frequency of self-excited oscillations in two-dimensional, separated transonic diffuser flows by solving the compressible, Reynolds-averaged, thin-layer Navier-Stokes equation with a two-equation turbulence model.
Proceedings ArticleDOI

Numerical simulation of transonic flows in diffusers

M.-S. Liou, +2 more
TL;DR: In this article, numerical simulations were made of two-dimensional transonic flows in diffusers, including flow separation induced by a shock or adverse pressure gradient, and a detailed comparison of the computed results with measurements showed good agreement in all cases.
Journal ArticleDOI

Linear stability analysis in transonic diffuser flows

Grégoire Casalis, +1 more
- 01 Jan 1998 - 
TL;DR: In this article, a linear stability analysis was applied to the problem of shock oscillations in a transonic diffuser flow, where the mean flow was calculated with a numerical code solving the averaged Navier-Stokes equations, but the proposed stability approach is limited to the core region where viscous effects can be neglected.