转弯运动通气超空泡形态及流场结构数值研究

超空泡航行体机动过程中空泡形态的预测是目前该领域亟待研究的问题。文章在两流体多相流模型的框架内建立了用于求解通气超空泡流转弯机动的三维数值模型。通过求解RANS方程和SST(Shear Stress Transport)湍流方程,预测了圆盘空化器转弯机动条件下生成的通气空泡形态,并同Logvinovich独立膨胀原理的计算结果进行对比,验证了文中数值模型的有效性。在此基础上,分析了转弯半径对通气空泡的形态尺度的影响,对比研究了不同弗鲁德数条件下通气空泡的流场结构。

Numerical Research on Ventilated Supercavity Shape and Flow Structure in the Turning Motion

For supercavitating vehicle, the prediction of cavity shape in the process of maneuver is an urgent problem to be investigated. In this paper, in the framework of two-fluid multiphase flow model,a three dimensional numerical model was presented for solving ventilated cavitating flow at the turning motion. By solving the RANS equations and SST (Shear Stress Transport) turbulence equations, the ventilated supercavity of disc cavitator was predictd and compared with the results of Logvinovich independence principle of the cavity section expansion, the comparsion results verified the accuracy of numerical model.On this basis, the influence of different turning radiuses to the cavity shape was analyzed and the flow structure was also investigated under the condition of different Froude number.