水动力作用下低速射流碎化的数值模拟

为研究射流在水动力作用下的碎化特性,采用有限体积法对轴对称坐标下Navier-Stokes方程进行了求解,考虑重力和表面张力的影响,并通过Volume-of-Fluid法与Level-Set法成功捕捉到界面的不稳定发展、变形及射流碎化过程,分析了流场内部速度场和压力场分布,结果表明,射流碎化长度随Re/We“5数呈指数型增加,最后探讨了射流速度、直径及周围流体密度、粘性等参量对射流的碎化过程的影响规律.

Numerical simulation of breakup in low-velocity liquid jet due to hydrodynamics

To investigate the characteristics of breakup for liquid jet due to hydrodynamics,the time-dependent axisymmetric equations of motion and continuity were solved by the finite volume algorithm,considering the influence of gravity and surface tension.With Volume of Fluid and Level Set method,the development of instability of interface and jet breakup were captured successfully,the results showed the exponential relations between the breakup length of jet and Re/We^0.5,and velocity and pressure distributions were obtained,the effects of jet velocity,diameter and ambient fluid viscosity,density were analyzed finally.