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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2016016555
pages 229-238

SHADOWGRAPH IMAGING AND POST-PROCESSING FOR HYPERSONIC BOUNDARY LAYER TRANSITION IN BALLISTIC RANGE

Zonghao Wang
Hypervelocity Aerodynamics Institute, China Aerodynamics Research & Development Center, Mianyang, P.R. China
Sen Liu
Hypervelocity Aerodynamics Institute, China Aerodynamics Research & Development Center, Mianyang, P.R. China
Aimin Xie
Hypervelocity Aerodynamics Institute, China Aerodynamics Research & Development Center, Mianyang, P.R. China
Jie Huang
Hypervelocity Aerodynamics Institute, China Aerodynamics Research & Development Center, Mianyang, P.R. China

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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