圆锥长直管段喷嘴内流场仿真研究

Investigation on the Simulation About the External Flow Field of Conical Long Straight Pipe Nozzle

通过ANSYS FLUENT软件,采用欧拉多相流模型对前混式磨料水射流内流场进行建模与仿真。观察不同参数下的仿真结果并进行比较,结果表明:压力升高继而导致喷嘴出口速度提高,通过简化公式计算所得喷嘴出口速度不一定准确;喷嘴出口直径变大会导致出口速度减小,且小于理论计算值;提供能量一定时,由于磨料体积分数增大会使得喷嘴出口速度减小,因此磨料体积分数不宜过大。

A simulation about the internal flow field of pre-mixed abrasive water jet was conducted by ANSYS FLUENT and Eulerian multiphase flow model. Results in different parameters were compared and indicated that： with the increase of the pressure,velocity in nozzle outlet will increase accordingly. Velocity in nozzle outlet which calculated by simplified formula was proved not exact.With the increase of the diameter of nozzle outlet,velocity in nozzle outlet will decrease correspondingly and below the theoretical calculating value. When the energy was constant,velocity in nozzle outlet will decrease due to the increasing of the abrasive volume fraction. Thus,the abrasive volume fraction should not be in a high level.