Experimental investigation on propagating characteristics of sinusoidal unsteady flow in open-channel with smooth bed  

作　　者：HU Jiang YANG ShengFa FU XuHui 

机构地区：[1]National Inland Waterway Regulation Engineering Research Center,Chongqing Jiaotong University,Chongqing 400074,China [2]State Key Laboratory of Hydroscience&Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Science China(Technological Sciences)》2012年第7期2028-2038,共11页中国科学（技术科学英文版）

基　　金：supported by the National Key Technology R & D Programof China (Grant No. 2011BAB09B01);the Chongqing Natural Science Foundation of China (Grant No. cstc2011jjA1167)

摘　　要：A high accuracy experimental system has been established for unsteady open-channel flow.Then 40 experiments were conducted to study the propagating characteristics of unsteady open-channel flow.From the experimental data,the variation law of propagating velocity,wave deformation rate,flow depth of wave peak and bottom,and other parameters were obtained.The experimental results show the followings.1) The propagating velocity of unsteady open-channel flows can be expressed by the sum of flow velocity and micro-amplitude wave velocity at wave peak.2) The waveform of an unsteady flow would deform when it propagates,with the rising stage becoming longer and the falling stage shorter;the deformation rate is a function of distance,period and relative amplitude of discharge.3) The flow depths of wave peak and bottom have a close relationship with the period of the unsteady flow.When the period is short,water depths of wave peak and bottom are both close to those of the average discharge in the condition of uniform flow.For a long period unsteady flow,the water depth of wave peak is close to that of the maximal discharge in the condition of uniform flow,while at the flow wave bottom,it is close to the depth of the minimum discharge in an uniform flow.4) Propagating characteristic of discharge is analogous to that of flow depth for unsteady flow.

关 键 词：open-channel unsteady flow propagating characteristic experimental investigation 

分 类 号：O357.1[理学—流体力学] TN927.2[理学—力学]