泥沙河道管线冲刷的紊动强度及雷诺应力特性实验探究

Experimental study on turbulent intensity and Reynolds stress characteristics of sediment river channel pipeline scouring

本研究借助实验室比尺模拟实验的方式,对河道管线冲刷的紊动强度及雷诺应力特性进行实验研究,探究泥沙河道管线未冲刷、起冲刷和冲刷裸露至稳定工况下的管线紊动强度及雷诺应力演变规律,为泥沙河道管线的设计施工提供实验数据参考。实验揭示,各工况条件下,中层液面以上1.5倍管线直径的管线后方区域的雷诺应力与紊动强度数值较大,此范围内管线应加以保护,管线埋设应尽可能靠近沙泥底层。

The turbulence intensity and Reynolds stress characteristics of river channel pipeline scouring are experimentally studied in the study with the help of laboratory scale simulation experiment.The pipeline turbulence intensity and Reynolds stress evolution law without sediment river channel pipeline scouring,scour starting and the scouring exposure to stable condition are explored,thereby providing experimental data reference for sediment river channel pipeline design and construction.The experiment shows that the Reynolds stress and turbulence intensity of the pipeline rear area o within 1.5 times pipeline diameter above the middle liquid level are relatively large under different working conditions.The pipeline should be protected within the scope,and the pipeline should be buried as close as possible to the bottom layer of sand and mud.