水利水电技术2017，Vol.48Issue(7)：74-78,101,6.DOI:10.13928/j.cnki.wrahe.2017.07.013
水流与壁面间切应力估计方法的比较研究
A comparative study on methods for estimating shear stress between water flow and wall-surface
摘要
Abstract
Accurate estimation on the shear stress between water flow and wall-surface has an important significance in the aspects of sediment transport and safety of water works.Seven main methods for estimating the shear stress between water flow and wall-surface adopted at present are evaluated and compared herein under various conditions of Reynolds numbers by selecting and processing the data from the relevant literatures;from which it is found out that so far as the reliability and accuracy are concemed,the extrapolated turbulent kinetic energy method and the extrapolated Reynolds stress method are highest for estimating the shear stress on wall-surface with the mean relative errors of 3.2％ and 5.2％ respectively;and then the turbulent kinetic energy method,TK method and Reynolds stress method take second place;furthermore,the accuracy of method of the law of wall is lowest,of which the necessary data are prone to be obtained yet.The accuracy of the quadratic stress method depends on the value of resistance coefficient.In which,the estimated values from both the methods of the law of wall and the quadratic stress method are slightly higher,but are more safe,while the estimated value from the extrapolated turbulent kinetic energy method is more accurate,whereas,the estimated values from the other methods are little bit too lower.The study result has a certain reference value for selecting the method for estimating the shear stress between water flow and wall surface as well as for calibrating the direct measurement device under various conditions.关键词
壁定理/二阶应力/湍流动能/雷诺应力/壁面切应力Key words
law of wall/quadratic stress/turbulent kinetic energy/Reynolds stress/wall-surface shear stress分类
建筑与水利引用本文复制引用
董宁澎,李大勇..水流与壁面间切应力估计方法的比较研究[J].水利水电技术,2017,48(7):74-78,101,6.基金项目
国家自然科学基金项目(41471014) （41471014）
