長方形断面を持つ液体衝撃波管内の圧力波に関する研究

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In a water-filled shock tube with rectangular cross section, it is shown that the propagation velocity of pressure wave in degassed water is around 200 m/s. The propagation velocities of a pressure wave in bubbly water are also determined as a parameter of void fraction, and it is clarified that the propagation velocity is affected by the shape of cross section and the elastic property of the tube materials and that the results are estimated by a modeling consideration of "water hammer" theory. Moreover, for one or two slug bubbles in a rectangular water filled shock tube the following facts are ascertained; (1) Its oscillation period by a pressure wave and the pressure change in it can be qualitatively shown by mean of a springs-masses model of slug bubble train, in spite of large deformation, such as water jet generation, of the bubbles. (2) The velocity of water jet, formed at the top or bottom surface of the slug bubble, is around 10m/s.
1984-04-01