Study on the Flow Field of Supersonic Jet Impingement over a Circular Hole on the Flat Plate

• Main Authors: Lee, Chien-Yung, 李健永
• Other Authors: Yu Fan-Ming
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/69778317335925975739

碩士 === 國立成功大學 === 航空太空工程學系 === 85 === The experimental investigation on a circular supersonic impinging jetover a flat plate with circular hole has been done. With a fixed jet exitMach number of 1.99, the flow field on a flat plate with circular hole ofradius 5mm, 10mm, 15mm impinging by a jet of total pressure of 6.1bar, 7.7bar and 9.7bar were studied by the color Schlieren flow visualizationof jet stream, oil flow visualization on the flat plate and the pressuremeasurement radially around the circular hole. The experimental resultsshown that as the hole closed to the nozzle exit, the variation on theradial pressure is dominated by the dimension of the hole. For the largerhole, since most of jet stream blow across the plate through the hole,thus the radial measured pressure is of small value. As the distances be-tween nozzle exit and the plate increased, the variation on the radial pressure distribution becomes dominated by this distance. For a large dis-tance, due to the expanding of jet stream, more portion of the jet streamimpinging directly on the flat plate around the hole and thus a higherradial pressure distribution near the hole. In some case, with a Mach diskshock wave of jet stream closed to the plate, the measured radial pressuredistribution show a higher value also.