机翼形堰绕流流场的PIV测量  

PIV measurement on airfoil weir cross flow

作　　者：王贞涛[1] 张星[1] 黄继伟[1] 黄俏梅[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《排灌机械工程学报》2011年第4期338-342,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏高校自然科学基金资助项目(09KJD470001);江苏大学高级人才科研启动基金资助项目(09JDG067)

摘　　要：为了研究机翼形溢流堰流动特性并探讨其水力特性,利用粒子图像速度场仪(PIV)在水槽中测量了相对水头高度(H0/P)分别为1.05,1.25,1.37,1.48,1.54时堰高与堰长比(P/C)为0.30的某机翼形堰的绕流流场,获得了5种雷诺数(Re)下对应流场的速度矢量、流线和涡量图.试验结果表明:在不同相对水头高度或来流速度下,机翼形堰具有相同的溢流流动特性,其速度、涡量分布规律基本相同,流线近似平行,流动平稳,无明显的漩涡出现,其绕流流动类似'贴体'流动,试验中堰顶处主流最大速度为0.36 m/s,上游堰踵和下游堰趾处速度较主流速度小得多,其值大小为0.05 m/s,速度的降低有效减少了水流对堰面的冲刷.堰顶处涡量最大为19.12 m2/s,加快了堰顶水流能量的耗散;上游堰踵和下游堰趾涡量几乎为0,避免了堰踵与堰趾出现危害性负压.In order to investigate overflow characteristics and discuss hydraulic characteristics about the airfoil weir,particle image velocimetry（PIV） technology was employed to measure the flow field over the airfoil weir which the ratio of height（P） and length（C） is 0.30 in flume under different relative water heads of 1.05,1.25,1.37,1.48 and 1.54.The flow velocity vector,streamline and vorticity under five corresponding kinds of Reynolds number（Re） were gained.The experimental results indicated that overflow characteristics including velocity and vorticity distribution regulation are same under different relative water heads or velocities.Stream lines are parallel approximately,flow is calm,and eddy was not found in the overflow near the airfoil weir wall.The airfoil weir overflow is ＂close to body＂ flow.The biggest velocity on the weir coping is 0.36 m/s in the experiment,and the velocity of weir heel and toe are less than main flow velocity and it is 0.05 m/s.It colud lessen the water flow erodibility.The vorticity which is 19.12 m2/s is biggest on the weir coping.Water flow energy dissipation on the weir coping was quickened.Dangerous pressure is avoided near the weir heel and toe where the vorticity is zero.

关 键 词：机翼形堰 流场 速度 流线 涡量 粒子图像速度场仪 

分 类 号：S277.9[农业科学—农业水土工程] TV652.1[农业科学—农业工程]