气液两相弹状流动中气弹及其尾流气泡参数的瞬态测量

利用管内气液两相弹状流中因气弹周围液膜加速、减速所致的波动差压，实验测量了气弹速度、气弹长度以及气弹尾流作用长度等参数，并利用气弹尾流气泡群在尾流瞬变压力激励下所辐射的声波及其频谱，对尾流气泡群的最可几尺寸进行了测量．实验结果及误差分析表明，该测量方法比传统方法在无流场干扰、测量结果多样性等方面显示出较强优越性．

Measurement of Kinematic Parameters for a Gas Slug and Estimate of Bubble Size

Slug velocity and length measurements are made from the acceleration and deceleration characteristics of a liquid film around a vertical gas slug. The unsteady disturbance is induced by the differential pressure fluctuation which determines the length of the wake flow behind the slug. The probable size of the bubbles in the wake region is estimated from the amplitude spectrum of sound radiated from the trailing bubbles. No disturbance to the flow field is observed from the measuring instruments and the technique is not restricted to environment constraints.