滑移速度对织构表面气穴效应的影响

发布时间：2018-03-18 21:50

本文选题：滑移速度　切入点：织构表面　出处：《机床与液压》2017年13期 　论文类型：期刊论文

【摘要】：为研究不同的滑移速度对织构表面气穴效应的影响,建立单个微凸体织构的二维计算模型,利用CFD方法模拟不同滑移速度下气穴效应在气体体积率、压力分布和壁面剪切力等方面的表现。研究结果表明:当滑移速度不超过5 m/s时,织构表面的流体中不产生气穴;当滑移速度由5 m/s逐渐增大到20 m/s时,在织构流体出口端的收敛区将生成气穴,气穴的大小随着滑移速度的增大而减小,气穴处的气体体积率随着滑移速度的增大而增加;当滑移速度继续由20 m/s增大至30 m/s之间的某值以后,气穴的大小不再减小,气体的体积率仍随滑移速度的增大而增加。滑移速度在5~30 m/s的范围内,滑移速度越大,产生的额外承载力越大,壁面剪切力越大。此外,气穴的存在有助于降低壁面剪切力。
[Abstract]:In order to study the effect of different slip velocities on the cavitation effect on texture surface, a two-dimensional computational model of single microconvex texture was established. The CFD method was used to simulate the gas volume ratio of the cavitation effect at different slip velocities. The results show that when the slip velocity is less than 5 m / s, there is no cavitation in the fluid on the texture surface, and when the slip velocity increases from 5 m / s to 20 m / s, In the convergent region of the exit of the texture fluid, the cavitation will be formed, the size of the cavitation will decrease with the increase of the slip velocity, and the volume ratio of the gas at the cavitation will increase with the increase of the slip velocity. When the slip velocity continues to increase from 20 m / s to 30 m / s, the size of the cavitation does not decrease, and the volume ratio of the gas increases with the increase of the slip velocity. The more the slip velocity is in the range of 530 m / s, the larger the slip velocity is. The larger the extra bearing capacity, the greater the wall shear force. In addition, the existence of cavitation helps to reduce the wall shear force.
【作者单位】：大连海事大学交通运输装备与海洋工程学院;
【基金】：国家自然科学基金资助项目(51379025)
【分类号】：TH117

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