中文摘要：

针对磨粒流在非直线管类零件中磨削效果受速度影响及磨削不均匀的问题,应用流体力学软件Fluent,采用Eulerian-Eulerian（欧拉—欧拉）固-液两相流大涡模拟湍流模型与SIMPLE算法,对不同入口速度条件下U型管内磨粒流的流动状态进行了数值模拟研究。对比分析了6种不同速度入口条件下的静态压强、壁面剪切力以及湍流粘度的分布,并分析了入口条件不变情况下的速度分布矢量图和U型管不同位置的速度分布截面图。研究结果表明,增大磨粒流的入口速度有利于提高其对U型管内表面的磨削效果,且在U型管的入口段部分磨削效果较均匀,在弯管部分的0°~30°截面间对内侧壁面的磨削效果要好于外侧壁面,在弯管部分的60°~180°截面间以及在出口段部分,对外侧壁面的磨削效果要好于内侧壁面。

英文摘要：

Aiming at investigating the effect of velocity on grinding results and the problem of non-uniform grind in nonlinear-tube compo- nent, the fluid dynamics software Fluent was applied with building the Eulerian-Eulerian mathematic model solid-liquid the phase flow of large eddy simulation and choosing simple arithmetic to research on the numerically simulate under flow condition of abrasive flow with differ- ent entrance velocity in U tube. The distribution maps of static pression, boundary stress and turbulence viscosity in six different entrance ve- locity were compared and the velocity distribution vector diagram was analyzed with same entrance conditions and velocity distribution section- al view in different location of U tube. The results indicate that increasing entrance velocity is beneficial to improve abrasive flow machining efficiency on the internal surface of U tube. Especially, the grinding results of entrance are more uniform; the cross section from 0°to 30°in bend region of internal surface is better than external surface and from 60°to 180°is opposite ; exit section of external surface is better than in- ternal surface.