空化泡液体外围压强的分布

Studies of the external pressure distribution of cavitation bubble

本文从空化泡动力学理论出发,分别讨论了空化泡在压缩和膨胀时液体中的压强分布情况,并作了数值模拟。研究结果表明,空化泡在膨胀和压缩时其外围压强分布明显不同,不能将其一并而论。发现当空化泡的半径增大时液体的压强在不断变化,压强是先变小后变大。而且这个压强的变化还与待测点距空化泡的距离有关。当空化泡的半径在不断变小时外界的压强在不断增大,当空化泡刚开始压缩时液体中的压强变化情况不是很明显,但当空化泡的半径变到1μm时,空化泡外界压强出现明显变化。当空化泡压缩到较小时,此时再增加外界压强空化泡的半径也不会在有很大的变化。

In this paper the external pressure distribution of a cavitation bubble is studied.From the cavitation bubble dynamics theory, we discussed the cavitation bubble in the compression and expansion of liquid pressure value of the distribution, and the numerical simulation. The results show that cavitation bubble in the expansion and compression of the peripheral pressure distribution is significantly different. It is found that ,when the cavitation bubble radius increases, the pressure of the liquid in the changing pressure becomes small at first and then become large. And this pressure change with the measured point is related to the distance of the cavitation bubble.