In regard to shock wave propagation, almost all experiments have been restricted within the range of room temperature or high temperature fluids. Conventional shock tubes of diahragm breaking have severe limitation for shock waves in low temperature fluids, owing to the contamination of water vapor and icing that are in-cluded in atmospheric influx during the diaphragm exchange. In this experiments new type of non-diaphragm shock tube is devised by liquid nitrogen cooling. Measurements of shock wave parameters in test fluids N_2, O_2, CO_2, R-12 to the lower range of 180K are conducted. Flow visualization of shadowgraphs by IMACON-790 is also performed. As the results, shock wave characteristics in low temperature gases are clarified. Among others condensation phenomenon of R-12 behind the shock waves, and strong spherical shock wave generation in liquid R-12 accompanied by vapor bubble collapse are visualized.
常温以下の気体中の衝撃波伝播とR-12液中の蒸気泡崩壊に関する実験
kiyo36_rikou_pp251-277.pdf
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