小攻角下航行体三维非定常空泡形态理论预示方法

小攻角下水下航行体高速运动时会形成不对称、非定常空泡,空泡形态是水下流体动力及弹道设计的主要依据。该文基于空泡独立膨胀原理,考虑横流对独立空泡发展的影响,建立了带攻角状态下空泡形态理论计算模型。针对典型工况开展计算获得了航行体迎背流面空泡长度、空泡压力变化过程,并与试验数据进行比对以验证模型的合理性。

Three-dimensional cavitation shape of the underwater vehicles at a small attack angle in unsteady flow

Asymmetry of unsteady cavities can be formed when the body moves with a high speed and small attack angle, which is the main design basis of hydrodynamics and hydroballistics. Theoretical model is es-tablished based on Logvinovich independence principle, considering the influence of crossflow effect. A typi-cal case is simulated to get cavity length of the face flow surface and the back flow surface, as well as cavity pressure. Finally, the comparison is performed between the results of the theoretical model and the experi-ment, which confirms the theoretical approach in this study.