后混合水射流喷丸喷头外流连续相数值模拟

为研究后混合水射流喷丸喷头外流场的运动特性,应用FLUENT软件对后混合水射流喷丸喷头外流场连续相进行了数值模拟。根据射流的湍动特性,连续相采用三维不可压缩稳态雷诺时均N-S方程,湍流模型采用标准k-ε模型。分析喷丸压力和靶距对外流连续相轴向速度和轴向动压强的影响。结果表明,外流连续相水的轴向速度和轴向动压强具有显著对称性,最大轴向速度和轴向动压强均出现在射流轴线上。其值随喷丸压力的增加而增大,随喷丸靶距的增加而减小。当喷丸压力为350 MPa、喷丸靶距为50 mm时,最大轴向速度为22.0 m/s,最大轴向动压强为0.24 MPa。该研究为外流离散相弹丸运动状态的分析奠定了基础。

Numerical simulation of continuous phase in nozzle external flow of mixed water-jet shot peening

Aimed at investigate the motion characteristics of the flow field outside of the nozzle in the mixed water jet shot peening,this paper introduces the simulation of the continuous phase of external flow field of the nozzle in the mixed water jet shot peening by FLUENT software,and offers an analysis of the influence of shot peening pressure and target distance to the axial velocity and axial dynamic pressure of water by using 3D incompressible steady reynolds time-averaged N-S equation for continuous phase and standard k-ε turbulent mode for dispersed phase based on the flow characteristics of turbulence in water jet.The simulation concludes that there occurs a significant symmetry between the axial velocity and axial dynamic pressure of water in the external flow field,and the maximum value is found in the centre of axis.The increase in value of axial velocity and axial dynamic pressure depends on the increase in the pressure in shot peening,and varies the increase of the target distance.The pressure of 350 MPa and the target distance of 50 mm produce the maximum value of axial velocity of 22.0 m/s and the maximum value of axial dynamic pressure of 0.24 MPa.The study provides the base for the analysis of motion states of the discrete phase projectile of external flow field.