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基于计算软件Fluent,选用在低压区引入空化模型中的混合多相流模型,针对孔板和文丘里管复合空化发生器中孔板在文丘里管喉部前部、中间、后部3种结构对水力空化效果的影响进行了数值模拟计算,获得了汽含率、湍动能以及流线速度矢量分布图等数据。结果表明:文丘里管喉部夹载孔板后空化效果显著提高,而且在文丘里管后部流域中发生了二次空化;空化现象大部分发生在孔板小孔和文丘里管后部,且最高汽含率区域发生在孔板末端区域;多孔孔板置于文丘里管喉部后部时空化效果更加明显。
Based on the computational software Fluent, a mixed multiphase flow model was introduced to introduce the cavitation model in the low pressure region. For the orifice plate and venturi composite cavitation generator, The effect of species structure on hydraulic cavitation effect was numerically simulated and the data of vapor content, turbulent kinetic energy and flow vector distribution were obtained. The results show that the cavitation effect of Venturi tube laryngole is significantly increased, and secondary cavitation occurs in the wake of Venturi tube. The cavitation occurs mostly in the orifice of the vent plate and the Venturi tube Rear, and the region with the highest vapor content occurs at the end of the plate; the time-space effect of the porous plate placed in the back of the venturi throat is more obvious.