力学学报 ›› 1997, Vol. 29 ›› Issue (1): 1-7.doi: 10.6052/0459-1879-1997-1-1995-189

• 论文 •    下一篇

二维空泡流的脉动性态研究

何友声;刘桦;赵岗   

  1. 上海交通大学工程力学系,200030
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1997-01-25 发布日期:1997-01-25

A STUDY ON PULSATION OF TWO-DIMENSIONAL CAVITATING FLOW

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  1. 上海交通大学工程力学系,200030
  • Received:1900-01-01 Revised:1900-01-01 Online:1997-01-25 Published:1997-01-25

摘要: 采用高速摄影技术对定常来流中NACA4412翼的不稳定的空泡流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-cavitatingflow)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

关键词: 空泡流, 跨空泡流, 脉动, 空泡断裂, 高速摄影

Abstract: The unsteady behavior of a two-dimensional cavitating flow around a NACA4412 foil is investigated in a cavitation tunnel by using the high-speed photography. The high speed photographic records show that there is a low frequency pulsating phenomenon caused by the abrupt breakup of 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-freq...

Key words: cavitating flow, trans-cavitating flow, breakoff, pulsation, high-speed photography