楔体后部非定常超空泡长度预测

Prediction of unsteady supercavities' length behind wedges

基于势流理论,采用积分方程方法,研究了薄楔体后部非定常自然超空泡流问题。应用时间有限差分离散化方法,得到了积分方程的数值解。预测了楔角和空化数作各种变化时,超空泡长度的非定常变化过程。楔角或空化数变化频率越高,空泡长度的变化越小,相对滞后时间越长。

Based on the theory of potential flow and using the integral equation method,the problem of unsteady natural supercavity flow behind the thin wedges is investegated.Some numerical results are obtained using finite difference time discretization method.The history of unsteady supercavities＇ length are predicted when wedge＇ a angle and cavitation number for various changes.The more the changed frquency of wedge angle or cavitation number,the less of the changed cavity length,and the longer of the relatively time lag.