Step Configuration Influence on Structure of Supersonic Reacting Flows in Channels with Sudden Expansion
The study of supersonic turbulent flows in the channelswith sudden expansion (step/ cavities) is actual task since this configuration is used for ignition and flame stabilization. Supersonic combustion is studied for many years in order to support the future hypersonic flights. It well known that it is rather difficult to get the ignition and stable combustion at supersonic speeds . The flow in the supersonic combustion chamber js charachterized by a short residence time which is only a few milliseconds of magnitude. A simple geometry to generate a flameholding region in supersonic flow is a backward facing step (BFS). Flows around BFS configuration were studied for decades and many papers were published regarding fundamental flow properties  as well as the scramjet combustion chamber utilization . The effect of step configuration (“boattailing”) on the structure of compressible base flows was investigated in a numerous papers since Hama’s work . Nevertheless, the question is little studied as far as supersonic chemically reacting flows in channels are concerned.
KeywordsReynolds Average Navier Stokes Recirculation Zone Bottom Wall Separation Zone Sudden Expansion
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