前混合水射流喷丸喷嘴内流数值模拟

为研究弹丸在前混合水射流喷丸喷嘴内的运动特性,应用FLUENT软件对前混合水射流出口带圆柱段和扩散段的圆锥收敛形喷嘴内液固湍流进行了数值模拟。控制方程为连续相采用三维不可压缩稳态雷诺时均N-S方程,湍流模型采用k-ε模型,离散相采用拉格朗日模型。分析了喷嘴出口圆柱段长度、圆锥收敛角和出口扩散段对内流特性的影响。结果表明,出口圆柱段长度为30 mm、圆锥收敛角为13°时,连续相可以获得最大的轴向速度,且离散相的加速效果也最佳;出口带扩散段的喷嘴使得连续相和离散相的出口速度均会下降,但会增大喷丸的覆盖率,提高喷丸工作效率。

Numerical simulation study of nozzle inside-flow of premixed Water jet peening

This paper presents an attempt to study the motion characteristics within the nozzle of premixed water jet peening,by a numerical simulation of solid-liquid turbulent flow through the cone convergent nozzle with column section and diffuser section at outlet used in premixed water jet with FLUENT software.The continuous phase involves the use of three dimensional incompressible steady state Reynolds time-averaged N-S equation,turbulence model the use of k-ε model,and discrete phase the use of Lagrange model.The paper gives an analysis of the influence on inside-flow characteristic by the cylindrical length of nozzle exit segment,convergence angle,and diffuser section in the exit.The results show that,where the cylindrical length of nozzle exit segment is 30 mm and convergence angle is 13°,the continuous phase is capable of the greatest axial velocity and the best dispersed phase acceleration effect,the diffuser nozzle in the exit allows the reduced the export velocity of continuous phase and discrete phase,but increased shot peening coverage and improved efficiency of peening.