| Summary: | 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.
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