强弯条件下分层流运动特性试验研究  

Laboratory investigation of stratified flows in strongly curved flumes

作　　者：华祖林[1] 褚克坚[1] 邢领航[1] 

机构地区：[1]河海大学环境科学与工程学院,江苏南京210098

出　　处：《水科学进展》2005年第2期203-209,共7页Advances in Water Science

基　　金：国家自然科学基金资助项目(50009001);江苏省自然科学基金资助项目(BK2000004)~~

摘　　要：采用物理模型试验对强弯明渠剪切分层流的运动特征机理进行了研究,试验中模型特别制作了直段、90°、180°强弯段3套试验水槽,模型配有上、下层两套不同的进水系统,以产生上下两层不同的流速和温度,形成剪切分层流,试验进行了直段、90°、180°强弯段多种不同流速工况组合,试验工况流态也从存在明显分层逐步过渡到强掺混状态。采用ADV、HR 2红外热像仪、电子式点温计等量测手段,较为系统地获得了沿程不同断面的流速、温度分布,以及湍流动能、雷诺应力等反映运动机制的物理量,揭示了在强弯曲条件下分层流运动沿程特征分布和断面环流结构,并与直道情形进行了比较。The dynamic mechanism of stratified shear flows in strongly curved flumes was experimentally studied. Three physical models, with straight flume and strongly curved flumes with 90° and 180° bend, were set up respectively. Two-layer flows with different velocity and temperature were produced by using the two independent inflow systems sets. In this experiment investigation, the different flow statuses from the obvious stratified flow to strongly entrainment were studied under the different velocity ratio between upper layer and lower layer. The distribution of velocities, temperatures, turbulent kinetic energy and the Reynolds stress and transect secondary flow were systemically measured and presented with some equipments such as ADV, infrared thermograph and digital thermometer, etc. The dynamic characteristic of stratified flows in curved flumes was revealed and compared with that in straight flume simultaneously.

关 键 词：分层流 强弯段 运动特性 试验研究 

分 类 号：X143[环境科学与工程—环境科学] TV131.21[水利工程—水力学及河流动力学]