STUDY　ON　THE　MECHANISM　OF　TURBULENT　PRODUCTION　AND　BURST　DETECTION　OVER　A　ROUGH　WALL  

作　　者：Wang, Jinjun 

机构地区：[1] Beijing Univ of Aeronautic and, Astrnautic, Beijing, China

出　　处：《Journal of Hydrodynamics》1996年第1期39-43,共5页水动力学研究与进展B辑（英文版）

摘　　要：Based on the analysis of the known quantitative observations and qualitative measurements in the near wall region of the flow over a smooth wall, the distribution of the skewness factor in the vertical direction has been discussed for the openchannel flow over a fully roughened wall. It is found that when H/ks > 1. 0,S >0 is obtained in the range of y/H <0. 2, which means that there exist the low speed streaks, i. e. the turbulence of the now is produced by the phenomenon called 'burst'. For H/ks <1. 0, which belongs to the large-scale roughness case, the turbulence will be produced in another way. Moreover, the burst period is also discussed in this paper.Based on the analysis of the known quantitative observations and qualitative measurements in the near wall region of the flow over a smooth wall, the distribution of the skewness factor in the vertical direction has been discussed for the openchannel flow over a fully roughened wall. It is found that when H/ks > 1. 0,S >0 is obtained in the range of y/H <0. 2, which means that there exist the low speed streaks, i. e. the turbulence of the now is produced by the phenomenon called 'burst'. For H/ks <1. 0, which belongs to the large-scale roughness case, the turbulence will be produced in another way. Moreover, the burst period is also discussed in this paper.

关 键 词：rough-bed turbulence mechanism skewness factor burst detection 

分 类 号：TV13[水利工程—水力学及河流动力学]