摘要
本文采用高速摄影技术对定常来流中1/4平头轴对称体的不稳定的空泡形态特征进行了水洞试验研究。试验结果揭示了由于空泡形态断裂而产生的低频脉动现象,这一现象在跨空泡流(Trans-cavitating flow)情况下尤为明显,常使空泡长度和厚度在大幅范围内拟周期地变动,其频率特性比较稳定,有别于空泡末端局部泡团脱落而产生的脉动。
The unsteady behavior of an axisymmetric cavitation tunnel by using the technique of highspeed photograph. From the high-speed photographic records, it shows that there is a low frequent pulsating phenomenon caused by the abrupt breakup of the cavity. This pulsation of cavitating flow appears significantly in case of the trans-cavitating flow and results in the pseudo-periodic evolution of cavity length and cavity thickness. The frequency characteristics of the low-frequent pubation seems to be stable and is different from the pulsation caused by the local breakup of the cavity at its tail zone.
出处
《上海力学》
CSCD
1997年第2期99-105,共7页
Chinese Quarterly Mechanics
基金
国家自然科学基金
关键词
轴对称体
空泡流
脉动
高速摄影
水动力学
axisymmetric body,cavitating flow,pulsation,high-speed photography.
