孔板水力空化装置的数值模拟

Simulation of Hydrodynamic Cavitation Equipment with Orifice Plates

基于FLUENT软件,采用k-ω型对孔板水力空化进行数值模拟,将相同条件下模拟所得的空化区与实验空化区进行比较。结果表明,模拟计算得到的汽含率分布与实验拍摄的汽含率分布相似,k-ω型模拟结果与实验结果吻合。采用该模型分析了不同入L口压力、孔板结构参数、液体物性参数对空化强度的影响,模拟结果表明,入口压力越大,空化强度越剧烈;增加孔径和孔的数量使空化强度减弱;增大液体密度和粘度使空化强度减弱;增大液体初始含气量使空化强度先增大后减小。

Based on the software FLUENT, the hydrodynamic cavitation with orifice plates was simulated using the κ-ω model. The simulation results were compared with experimental data at the same situations, which showed that the distribution of vapor fraction by simulation was similar to that of experiment. The influences of inlet pressure, structures of orifice plate and physical characters of liquid on cavitation intensity were investigated by simulation using this model. The intensity of cavitation increased with increasing of inlet pressure and the orifice diameter and number. The intensity of cavitation decreased as the increase of density and viscosity of liquid. when the initial gas holdup increased, the intensity of cavitation increased first and then weaken.