两相流射流的最小半径数值研究  

Numerical Research on Minimum Radius of Two-phase Water Jet

作　　者：周晶林[1] 韩凤琴[1] 吴迪[1] 久保田乔[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《水电能源科学》2007年第5期110-114,共5页Water Resources and Power

基　　金：国家自然科学基金资助项目(50379015)

摘　　要：针对大气中水射流的动态特性,使射流形状、特性难以精确预测,提出了判定射流缩流截面的准则,进行了多工况下自由射流非定常两相流数值解析,对射流特别是两相流分界面区域的能量分布及涡度进行了分析,根据VOF法对射流自由表面进行数值预测的结果,获得了射流缩流半径、射流膨胀率等重要参数,并对自由射流尺度效应进行了探讨。Owing to dynamic property of water jet in the air, it makes difficult to predict the shape and performance of water jet accurately. The criteria judging the water jet contractive section is presented and numerical solutions of two- phase unsteady flow are solved for multi operating-points free-flow jet. And then the energy and vorticity distributions of water jet are analyzed, especially for the interface of two-phase flow. According to the predictive results of the free surface of water jet with VOF method, important parameters including contractive radius and expansion rate of water jet are obtained and the scale effect of free-flow jet is also discussed in the paper.

关 键 词：两相流射流 非定常流 射流缩流 VOF法 尺度效应 

分 类 号：TK735[交通运输工程—轮机工程]