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On the start condition of a second-throatejector-diffuser

Published online by Cambridge University Press:  04 July 2016

J. J. Wang and
F. Chen
J. J. Wang
Affiliation:
Institute of Applied Mechanics National Taiwan University Taipei, Taiwan, ROC
F. Chen
Affiliation:
Institute of Applied Mechanics National Taiwan University Taipei, Taiwan, ROC
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Abstract

The start condition of a second-throat ejector-diffuser(STED) system has been studied by solving theaxisymmetric Navier-Stokes equations with a highorder conservative supra-characteristics method(CSCM). According to the conventional concept, whena STED is started, the flow passing through thesecond-throat contraction should be supersonic sothat the normal shock swallowing condition applyingfor a supersonic windtunnel holds. The presentnumerical results, however, suggest that a STED canbe started with a normal shock forming ahead of thesecond-throat contraction because the high speedflow in the region close to the wall of the diffuserserves to release the mass blocked by the normalshock, leading to a decrease in chamber pressure aswell as the start of the system. This not onlycontradicts the conventional concept of the start ofa STED, but also provides an explanation for theexperimental discrepancy between the startconditions of a STED and a supersonicwindtunnel.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 100 , Issue 998 , October 1996, pp. 321 - 326
Copyright
Copyright © Royal Aeronautical Society 1996 

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