Influence of attack angle on ventilated supercavitating flow at high Froude number condition

高弗劳德数条件下攻角对通气超空化流动影响

School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China

Received: 12 January 2022

Abstract

To study the influence of attack angle on ventilated supercavitating flow, a numerical model is established to simulate the supercavitation flow by using the inhomogeneous multiphase flow model and the SST k-ω turbulence model. And then, the model is verified and validated by comparing with the experimental results. The effect of attack angle on the profile of ventilated supercavity was numerically investigated over high Froude number. Results show that the attack angle causes the linear deviation of the ventilated supercavity axis, the deviation angle is in direct proportion to the attack angle, the deviation direction is opposite to the lift of the cavitator, and the deformation of the supercavity contour increases along the flow direction. The attack angle changes the gas flow structure inside the ventilated supercavity, causing the different deformation of the upper profile and lower profile. Under the condition of positive attack angle, the deformation of the lower profile of the supercavity generated by the disk cavitator is significantly greater than that of the upper profile.

摘要

为研究攻角对通气超空化流动的影响特性, 采用分相流模型和SST k-ω湍流模型建立了通气超空化数值计算模型, 结合水洞试验验证了模型的有效性, 研究了高弗劳德数条件下系列攻角对通气超空泡的形态影响。结果表明: 攻角引起通气超空泡轴线的线性偏移, 偏移角度与攻角大小呈正比, 偏移方向与空化器升力方向相反, 超空泡轮廓的变形量沿流动方向越来越大; 来流攻角改变了通气超空泡内部的气体流动结构, 导致超空泡上下轮廓的变形量发生差异, 正攻角条件下圆盘空化器生成的超空泡的下表面变形量明显大于上表面的变形量。