凹槽参数对通气空泡融合的影响

水下航行体通气技术形成的空泡能够有效降低航行阻力并调节运动姿态,但通气空泡在航行体表面不易融合,空泡形态不稳定,因此开展通气空泡的融合控制具有重要工程应用价值。采用有限体积法进行数值计算,研究了航行体孔后开槽对通气空泡融合的控制作用,并探究了不同凹槽参数对通气空泡融合的影响。研究发现,凹槽改变了空泡的流场特性,槽内产生的旋涡卷吸流经凹槽的气体,使槽内气体向航行体周向发展并融合;当槽宽取0.125D,孔槽间距取0.075D时,对空泡融合的促进以及稳压效果最佳。

Influence of Groove Parameters on Ventilated Bubble Fusion

The bubble formed by the ventilation of the underwater vehicle can effectively reduce the navigation resistance and adjust the movement posture. However, ventilated bubbles are not easy to fuse on the surface of the vehicle, and the cavitation shape is unstable. Therefore, the fusion control of ventilated bubble has important engineering application value. The finite volume method is used in this paper for numerical calculation. The effect of adding a groove behind stoma on the ventilated bubble fusion is studied. The influence of groove parameters on bubble fusion is studied. The results show that the groove changes the flow field characteristics of the bubble. The vortex generated in the groove entrains the gas flowing through the groove, and the gas in the groove develops and merges in the circumferential direction of the vehicle. When the groove width is 0.125D and the hole-groove distance is 0.075D, the effect of promoting bubble fusion and stabilizing pressure is the best.