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建立了描述冲击式旋转机械中穴泡群特性的数学模型。该模型的牲征为：认为火泡是旋转机械中液体的压力脉动引起的。最后，给出了相对穴泡产生压力与斯特罗准数（Ｓｔｒｏｕｈａｔ）的关系曲线。
A mathematical model describing the characteristics of Cryptomere in an impulse rotary machine was established. The sign of this model is that the bubble is caused by the pressure pulsation of the liquid in the rotating machinery. Finally, the relationship between relative bubble pressure and Strouhthat is given.