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Pressure over a dual-cavity cascade at supersonic speeds

Published online by Cambridge University Press:  04 July 2016

X. Zhang  and
J. A. Edwards
X. Zhang
Affiliation:
Department of Aeronautics and AstronauticsUniversity of Southampton, Southampton, UK
J. A. Edwards
Affiliation:
Weapons Systems SectorDERA Fort Halstead, Sevenoaks, UK
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Abstract

Pressure distributions over a dual cavity cascade were studied at supersonic speeds of Mach 1·5 and 2·5. The study was performed through numerical modelling and results compared with model measurements. The Reynolds-averaged Navier-Stokes equations were solved using a finite-volume algorithm in which the inviscid cell interface fluxes were estimated using Roe's approximate Riemann solver with a second-order extension, and turbulence was modelled using a two-equation k-m model with compressibility corrections. Two test configurations were selected: (1) a length-to-depth ratio L/D = 1 cavity followed by another L/D = 1 cavity, and (2) an L/D = 3 cavity followed by an L/D = 1 cavity. The prediction was compared with that of a single cavity of the same L/D. It was found that the pressure field around the L/D = 1 cavity was substantially modified by a preceding L/D = 3 cavity. Changes in the pressure and pressure drag coefficient were observed. The study clarified some earlier observations of unsteady modes over a dual cavity cascade, and confirmed model measurements of the pressure fluctuation under a number of flow and geometry conditions.

Type
Research Article
Information
The Aeronautical Journal , Volume 103 , Issue 1019 , January 1999 , pp. 45 - 54
Copyright
Copyright © Royal Aeronautical Society 1999 

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