Olivier Chazot, Geoffrey Andrews, Dániel G. Kovács, Guillaume Grossir

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2022-453

Hypersonic facilities are essential for the investigation of aerothermodynamic phenomena which have
a direct impact on high-speed vehicles’ design. The flow quality and characterization is of utmost
importance for the ground testing experiment. The paper is looking at the expansion flow in a
hypersonic nozzle and presents a methodology to determine the stability characteristics of the boundary
layer developing along the nozzle wall. It offers the occasion to discuss and investigate how the
turbulent boundary layers generated in a hypersonic nozzle. The selected test case is that of the
accelerating flow within the axially contoured nozzle of the VKI Longshot facility. The design of its
nozzle profile is first presented followed by the experimental characterization of its expansion flow inside
the nozzle. The stability analysis of the nozzle wall boundary layer is finally exposed with a discussion
on the physical mechanisms responsible for the development of instabilities.

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In Categories: HiSST 2022, Hypersonic Fundamentals and History
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