前混合水射流喷丸强化喷嘴流场的数值模拟

Numerical simulation in nozzle flow field of premixed water-jet peening strengthening

为研究前混合水射流喷丸强化喷嘴流场流动特性,应用FLUENT软件对喷嘴流场进行数值模拟。根据射流的流动特性,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,分析了水和弹丸流场轴心速度和轴心动压强的变化规律及不同喷丸压力、收敛角和弹丸浓度对喷嘴流场的影响规律。研究表明:前混合水射流的水流场和弹丸流场轴心速度存在速度滑移,水流场的轴心速度大于弹丸流场的轴心速度,而弹丸流场的轴心动压强明显大于水流场的轴心动压强;且水流场和弹丸流场的轴心速度和轴心动压强均随着喷丸压力的增加而增大、随着喷嘴圆锥收敛角和弹丸浓度的增加而减小,在13°圆锥收敛角时喷嘴的性能最好。

Aimed at studying the nozzle flow characteristics of premixed water jet shot peening strengthening, the nozzle flow field is numerical simulated by FLUENT software. The analysis of the vari- ation regulation on axial velocity and axial dynamic pressure of water and projectile flow field and the effect of different shot peening pressure, convergence angle, projectile concentration on the nozzle flow field based on the flow characteristics of the jet, Euler model used as the muhiphase flow model and the standard k-epsiion model used as turbulent eddy viscosity model in the numerical simulation. The re- search shows that the axial velocity of water and projectile flow field of premixed water jet exists slip ve- locity, and axial velocity of water flow field more than that of projectile, but dynamic pressure of projec- tile flow field higher than that of water, and the axial velocity and axial dynamic pressure of water and projectile are added with the adding shot peening pressure, while reduced with the increasing of cone contraction angle of nozzle and concentration of projectile, and the performance of the nozzle best as the contraction angle is 13°.