利用循环式空泡水洞,对航行体模型的通气超空泡内压强分布及其对空泡尾部流场的影响情况进行了实验研究.当水流速度在10～20 m/s之间时,采用人工补气的方式生成超空泡.通过改变通气量、水的流场压强等参数测量空泡内多点处的压强,得到超空泡内的压强分布规律.实验表明,超空泡内的压强沿流向呈下降趋势;空泡尾部压力梯度变化很大,从而引起震荡式回注射流的产生,破坏航行体的稳定性.%A series of experiments about supercavitating flow around underwater vehicle are conducted in a high-speed cavitation water tunnel to investigate the pressure distribution in the supercavity and the properties of rear flow field near the supercavity. The supercavity is filled by air and is related to artificial or ventilated cavity to form supercavitating flow at low speed (V=10～20 m/s). The pressure distribution in the supercavity was found by analyzing and measuring the pressure of several places in supercavity under conditions of various ventilation rate, the hydrostatic pressure p∞ and so on. The result indicates that the pressure in supercavity changes along the stream direction. The pressure gradient at rear of cavitation changes strongly, so the vibration re-entrant jet is caused. Further the re-entrant jet affects the motion stability of underwater vehicle.
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