前混合磨料射流喷嘴内流的数值模拟研究

Numerical Simulation Study of the Nozzle Inside-flow of Premixed Abrasive Water Jet

基于多相流动的拉格朗日离散相模型,应用FLUENT软件对前混合磨料射流出口带圆柱段的圆锥收敛形喷嘴内部等温、不可压缩、稳态、液固湍流进行了数值模拟。连续相采用三维不可压缩稳态雷诺时均NS方程,湍流模型采用标准的kε模型,代数方程组采用分离解方法,通过SIMPLE算法求解压力速度耦合;离散相采用拉格朗日方法追踪颗粒运动轨迹;收敛残差为10-4。给出了颗粒初始位置对颗粒的运动速度和运动轨迹的影响规律,数值模拟结果对前混合磨料射流喷嘴的优化设计和工程应用具有很好的指导意义和参考价值。

According to the Lagrange Discrete Phase Model of multiphase flow, a numerical simulation has been conducted for isothermal, incompressible, steady state, solid-liquid turbulent flow through cone convergent nozzle with column section at outlet used in premixed abrasive water jet with FLUENT software. The continuous phase uses three dimensional incompressible steady state Reynolds Time--averaged N-S equations, and Turbulence model uses the standard k-ε model. And the algebraic equation groups apply segregated solution method. The pressure--velocity coupling is solved though the SIMPLE method. The Lagrange approach is used to trace the particle movements in Dispersed phase. And the convergence criteria is 10^-4. Having given the affection rule of the velocity and track which resulted from the starting position of particle, the simulation results can be used to optimizing the design and engineering application of the nozzle of premixed abrasive water jet.