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

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

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2014010378
pages 111-123

SHEAR LAYER AND WAVE STRUCTURE OVER PARTIALLY SPANNING CAVITIES

Rajarshi Das
Department of Mechanical Engineering, Andong National University, Andong, Gyeongsangbuk-do, South Korea
Heuy Dong Kim
Department of Mechanical Engineering, Andong National University, Andong 760-749, Korea
Job Kurian
Indian Institute of Technology, Madras

ABSTRAKT

Study of the wave structure and shear layer in the vicinity of the cavity mounted on the wall is carried out by the time-averaged color schlieren and time-resolved instantaneous shadowgraph technique in an M = 1.7 flow field. The effect of the change in the cavity width on the flow structure is investigated by using the constant length to depth (L/D) ratio cavity models with varying length to width (L/W) ratio of 0.83 to 4. The time-averaged shock wave structure was observed to change with a change in the cavity width. The dependence of the shock angle at the leading edge on the shear layer width is also evident from the images obtained. Unsteadiness in the flow field in terms of the shear layer dynamics and quasi-steady nature of shock waves was evident from the images obtained during instantaneous shadowgraph experiments. Apart from the leading and trailing edge shocks, several other waves and flow features were observed. These flow features and the associated physical phenomena are discussed in detail and presented in the paper.