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Inlet Isolator and Combustor Physics at Take-Over Region of Scramjet Engines
This report outlines an effort to understand the impact of inlet isolator physics on the combustion of scramjet engines under actual flight relevant conditions in the take-over regime. We strive to answer the fundamental question "what basic physics underlying the connection between inlet isolator physics and combustion stability in canonical axisymmetric and/or rectangular geometries are applicable to more practical systems?" More specifically, the objective of the proposed work is to gain a fundamental understanding of the feedback mechanism between the boundary layer structures and separated flow in the isolator and the corresponding combustion dynamics that can lead to instabilities and/or unstart. An experimental effort is proposed where unstart and combustion instabilities are investigated in an optically accessible axisymmetric scramjet model in a free flow high enthalpy flow tunnel. The effort will be coupled with advanced spatially resolved diagnostics of both the isolator and the combustor region to obtain critical insight into the key physics, and potentially evolve into a foundational platform numerical analysis in the future.
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