欧拉模型的后混合水射流喷丸喷头内流数值模拟

Eulerian-model-based numerical simulation of post-mixed water jet peening nozzle influx field

为研究后混合水射流喷丸喷头内部两相流的运动规律,采用FLUENT软件对其内部液固两相流场进行数值模拟。根据其流动特性,数学模型采用欧拉模型,湍流模型采用标准的k-ε模型,并将固体相看作拟流体,分析喷丸压力和靶距对轴向速度和轴向动压强的影响。结果表明:喷头内的轴向速度和轴向动压强的变化规律是相似的,并且在相同的喷丸条件下,水流场的轴向速度大于弹丸流场的轴向速度,水流场的轴向动压强小于弹丸流场的轴向动压强。当喷丸压力为10MPa、靶距为55 mm时,水流场和弹丸流场在弹丸喷嘴出口处的轴向速度分别为63.3和56.9 m/s,水流场和弹丸流场在弹丸喷嘴出口处的轴向动压强分别为1.97和3.94 MPa。

This paper highlights the numerical simulation of the liquid-solid two-phase flow field using the FLUENT software as part of our efforts to investigate the law associated with the movement of two phase flow inside post-mixed water jet and introduces. The analysis of the effect of the peening pressure and peening standoff distance on axial velocity and axial dynamic pressure draws on flow characteristics and Eulerian model used as the mathematical model,the standard k-epsilon model as turbulence model and the solid phase taken as pseudo fluid. The analysis suggests that axial velocity and axial dynamic pressure inside nozzle behave according to a similar law,and for the same peening,axial velocity is greater for water flow field than for pill flow field,and the axial dynamic pressure is smaller for water flow field than for axial dynamic pressure of pill flow field. With the peening pressure of 10 MPa,and length of pill nozzle of 55 mm,the axial velocity is 63. 3 m / s and 56. 9 m / s respectively for water flow field and pill flow field in the outlet of pill nozzle; the axial dynamic pressure is 1. 97 MPa and 3. 94 MPa respectively for water flow field and pill flow field in the outlet of pill nozzle.