天然微弯河道雷诺应力分析  

Analysis of Reynolds Stress in Natural Rivers with Slight Curve

作　　者：徐海涛[1] 卢金友[1] 姚仕明[1] 刘小斌[1] 

机构地区：[1]长江科学院河流研究所,武汉430010

出　　处：《长江科学院院报》2005年第1期13-15,共3页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金资助项目(50179001)

摘　　要：采用多谱勒三相流速仪,在长江干流黄陵庙水文观测断面进行脉动流速观测,获得了不同流量级、不同垂线的脉动流速资料。在普朗特掺长假定的基础上对掺长与水深的函数关系进行分析研究,目的是寻求雷诺应力计算的可行途径,并为天然河流雷诺方程的封闭探求方法。提出了计算掺长的拟合多项式,基于提出的拟合多项式对雷诺应力进行计算,计算值与实测资料吻合良好。Field experiments on fluctuation velocities were carried out at the section Huanglingmiao of stem stream of Yangtze River with an Acoustic Doppler Current Profile (ADCP). And a number of data such as velocities of different discharges and different vertical lines were obtained. On the basis of Prandtl's mixing length, the function relationship between mixing length and water depth was researched, which searched a feasible way on calculation of Reynolds stress and studied the closed Reynolds equations in the natural river. The paper also puts forward the quasi-polynomial about calculation of mixing length on which the calculation of Reynolds stress is based. Finally, the calculated values are in good agreement with the field data.

关 键 词：天然河流 普朗特掺长 雷诺应力 动量传递 

分 类 号：TV143[水利工程—水力学及河流动力学]