突跌突扩掺气坎水力特性的三维数值模拟  

Three Dimensional Numerical Simulation of Hydraulic Characteristics of Aerator with Sudden Lateral Enlargement and Bottom Drop

作　　者：兰观福[1] 杨具瑞[1] 田振华 罗晶[1] 李立年[3] 

机构地区：[1]昆明理工大学电力工程学院,云南昆明650051 [2]黑龙江省水利科学研究院,黑龙江哈尔滨150080 [3]中国水电顾问集团昆明勘测设计研究院,云南昆明650051

出　　处：《人民黄河》2011年第7期112-115,共4页Yellow River

基　　金：国家自然科学基金资助项目(50769001);云南省中青年后备人才基金资助项目(2005PY01-34)

摘　　要：采取VOF方法和RNG紊流模型对某工程泄洪底孔突跌突扩掺气坎的三维水流进行数值模拟研究,得到了水面线、流速、压力沿程分布、水流空化数和掺气空腔特性等水力学要素,并将部分计算结果与模型试验结果进行了对比,两者符合较好,表明采用数值模拟的方法来研究泄洪底孔突跌突扩掺气坎的复杂流场是可行的,但数值模拟方法还不能有效地预测掺气空腔的回水特性。The VOF method and the RNG turbulence model were applied to numerically simulate the 3D flow of aerator with sudden lateral enlargement and bottom drop at the bottom of spillway for some project outlets.The hydraulic properties such as the water-surface profile,velocity,pressure along the flow direction,flow cavitation number and characteristics of the aerated cavity were computed.The results are in good agreement with model test.The successful simulation shows that by combining the RNG turbulence model with VOF method to study the aerator with sudden lateral enlargement and bottom drop of the complex flow field is feasible.However,the numerical simulation is temporarily unable to effectively predict the backwater feature in the aerated cavity.

关 键 词：VOF方法 RNG紊流模型 数值模拟 突跌突扩 掺气坎 

分 类 号：TV135.2[水利工程—水力学及河流动力学]