【摘要】 采用具有良好捕捉流体界面特性的无网格移动粒子法(MPS粒子法)对闪蒸射流过程进行二维直接数值模拟。该数值方法采用完全的拉格朗日描述定义流体运动,流体离散为可移动的粒子,流体控制微分方程转化为粒子间的相互作用。直接数值模拟结果与相关实验结果一致:发生于界面的闪蒸将射流剥落为锥状,射流长度随压力衰减比的增加而变短。更多还原

【Abstract】 The flashing liquid injection into another ambient liquid is two-dimensionally simulated using a meshless particle method(called Moving Particle Semi-implicit(MPS) method).The numerical method has great advantage to compute interfacial and surface flows.It is the full Lagrangian description of fluid.Fluid is represented as moving particles,and the governing equations are transformed into particle interactions.The direct numerical simulation results are consistent with the experimental observations of highly expanding flashing jet into atmosphere.It is demonstrated that a flashing jet is worn(away) into a cone shape and the jet extinct length decreases with the increasing of pressure decay ratio of injection pressure to backpressure.更多还原