Published 4 issues per year
ISSN Print: 1065-3090
ISSN Online: 1940-4336
Indexed in
SHADOWGRAPH IMAGING AND POST-PROCESSING FOR HYPERSONIC BOUNDARY LAYER TRANSITION IN BALLISTIC RANGE
ABSTRACT
To meet the research needs of hypersonic boundary layer transition, high-resolution shadowgraph imaging and post-processing technology have been developed in the hypervelocity ballistic range at the Hypervelocity Aerodynamics Institute, China Aerodynamics R. & D. Center (CARDC). It was applied in the hypersonic boundary layer transition measurements in the free-flight ballistic range. The test model was a 5° half-cone with skirt and 110 mm in length. The flight Mach number was 5.76, the unit Reynolds number was 8.82 × 108 m-1, and the attack angle was 0.2°. An image of a boundary layer with laminar-to-turbulent transition was obtained, from which the burst and breakdown of a turbulence spot, relaminarization, and reseparation were observed. A post-processing technique was developed based on the frequency spectrum analysis of the greyscale image, and the evolution characteristic of destabilization and eddy was worked out.
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