Abstract
Flowfields of the M2.2 jet impinging on an inclined flat plate at various plate angles, nozzle-plate distances, and pressure ratios are experimentally investigated using pressure-sensitive paints and Schlieren flow visualization. The effect of temperature variation on the flat plate is eliminated by the calibration using temperature-sensitive paints. A comparison with the former experiment shows that the current pressure-sensitive paint measurement produces reliable data sufficient for the flowfield discussion under consideration. The pressure-sensitive paints and Schlieren images obtained in the experiment suggest that the flowfields at various flat plate angles, nozzle-plate distances, and pressure ratios can all be classified into three types of flow structure. Within the range of geometrical and flow conditions considered in the present paper, the flowfield patterns can be predicted without experiments if the shock cell length in the freejet for various pressure ratios is known in advance. Extensive studies for a wide range of geometrical and physical parameters became feasible with a new efficient pressure/temperature-sensitive paint measurement technique showing surface pressure map with much less effort compared to conventional pressure tap measurement.
Published Version
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