基于磨粒流加工异形管内表面的数值模拟研究

A Study of the Effect of Abrasive Concentration on the InnerSurface of Profiled Tubes Machined by Abrasive Grain Flow

为分析磨料浓度及入口速度对磨粒流加工异形管内表面的影响,以异形管为研究对象,对固液两相磨粒流加工过程进行数值模拟分析。通过分析不同磨料浓度条件下的异形管内表面的壁面剪切力和压力大小,发现随着磨料浓度的减小,异形管内表面受到的壁面剪切力逐渐增加,入口处的壁面剪切力最大。异形管内表面的压力随着磨料浓度的减小也逐渐增大,越靠近入口处,压力越大。通过分析不同入口速度下异形管壁面剪切力与压力分布情况,发现随着入口速度的增大,异形管内表面所受到的壁面剪切力与压力逐渐增加,当磨料从大孔流经小孔时,磨粒对内表面的切削作用增大,获得的表面质量变好。

In order to analyze the effects of abrasive concentration and inlet velocity on the inner surface of the profiled tube processed by abrasive flow,the solid-liquid two-phase abrasive flow process was analyzed by numerical simulation with the profiled tube as the research object.By analyzing the wall shear force and pressure on the inner surface of the profiled tube under different abrasive concentration conditions,it is found that the wall shear force on the inner surface of the profiled tube increases gradually with the decrease of abrasive concentration,and the wall shear force at the inlet is the largest.The pressure on the inner surface of the profiled tube also increases with the decrease of abrasive concentration,and the closer to the inlet,the higher the pressure.By analyzing the distribution of wall shear force and pressure of the profiled tube under different inlet speeds,it is found that the wall shear force and pressure on the inner surface of the profiled tube increase gradually with the increase of the inlet speed,and when the abrasive material flows through the small hole from the large hole,the cutting effect of abrasive particles on the inner surface increases,and the surface quality obtained becomes better.