Abstract
This paper describes ongoing research efforts in the scramjet community, in general, as well as specific work at Stanford University on cavity flame-holders, a concept for flame-holding and stabilization in supersonic combustors. During the last few years, cavities have gained the attention of the scramjet community as a promising flameholding device, owing to results obtained in flight test and to feasibility demonstrations in laboratory scale supersonic combustors. However, comprehensive studies are needed to determine the optimal configuration which will yield the most effective flameholding capability with minimum loses. In the first cavity study, reported in this paper, the goals were to demonstrate ultra-high-speed schlieren imaging as applied to study a cavity with length-to-depth-ratio of L/D=3. By combination of simultaneously performed fast response pressure measurements, established cavity oscillations were observed and a sequence of oscillation cycles could be captured during the limited test time (~300us) of the flow facility. The results demonstrate that short duration pulse facilities can be used to study gasdynamics aspects of cavities, though with small dimensions (depth of D=3mm), in hypersonic flows.
Published Version
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