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从理论分析和数值计算两方面研究不同背压下的液体离心喷嘴内液膜厚度.在经典理论的基础上建立的包含气液界面摩擦作用的损失系数理论模型并不足以体现背压对液膜厚度的改变;通过使用旋转轴对称模型在自适应网格中求解耦合VOF(volume of fluid)方程的Navier-Stokes方程组的数值模拟表明,随气体密度增加而减小的气液界面附近过渡区域中的平均速度分布是导致液膜厚度增加的原因.
From theoretical analysis and numerical calculation, the thickness of liquid film in liquid centrifugal nozzle under different backpressure is studied. The theoretical model of loss coefficient based on the classical theory is not enough to show the effect of backpressure on liquid film The numerical simulation of the Navier-Stokes equations coupling the VOF (volume of fluid) equation in the adaptive grid using a rotational axisymmetric model shows that the transition zone near the gas-liquid interface decreases with increasing gas density The average velocity distribution in the film is the reason why the film thickness is increased.