后混合水射流扇形混合喷嘴的设计与流场数值模拟

摘要

This paper is aimed at an improved performance of surface treatment of rearmixed water jet shot peening.The study involves the numerical simulation of the liquid-solid two-phase flow field of nozzle using Fluent software after the designing of rearmixed water jet nozzle with fan-shaped mixed nozzle structure based on the rearmixed water jet nozzle used for cutting.The numerical simulation uses the Euler model for the multiphase flow;and the k-ε model for turbulence eddy viscosity model,followed by an analysis of the influence of V-shaped angle of fan-shaped mixed nozzle on both jet diffusion width and axial velocity.The result shows that fan-shaped mixed nozzle performs at the best V-shaped angle of 45 °,in which case,solid projectile flow field along groove direction has the diffusion width of 15.39 mm and projectile flow field has the axial velocity of 52.70 m/s,as occurs with 10 mm target distance.%为了提高后混合水射流表面处理工作效率,在切割用后混合水射流喷头基础上设计出具有扇形混合喷嘴结构的后混合水射流喷头,应用Fluent软件对喷头液固两相流场进行数值模拟.数值模拟中多相流动采用欧拉模型,湍流涡黏模型采用标准k-ε模型,分析扇形混合喷嘴V形切槽夹角对射流扩散宽度和轴心速度的影响.研究表明:扇形混合喷嘴最佳V形切槽夹角为45.,该夹角时10 mm靶距位置固相粒子流场轴向速度沿切槽方向扩散宽度为15.39 mm,轴心速度为52.70 m/s.