桩群绕流后方流态影响区段比较测试研究

通过有限深度均匀流水槽试验研究了不同的圆柱桩群与方柱桩群对均匀水流绕流后方流态区段影响程度及范围,对多组试验研究数据对比分析研究揭示：桩群绕流对均匀水流的影响规律、性质与程度;桩群后方流场流态影响区段范围的影响规律.发现同排列形式的方柱桩群对水流绕流的影响甚于圆柱桩群;垂直于水流方向排列桩柱密度对桩群绕流的影响甚于顺水流方向桩柱排列的密度;雷诺数对桩群绕流影响很大;水利工程实际中采用小尺寸桩柱优于大尺寸桩柱.

Comparative Test and Study on the Area of Flow Regime Influenced During Flowing Around Various Pile Clusters

By comparative testing and studying and analyzing on the area and range of flow regime in- fluenced during the uniform water flow with free surface and definite depth flowing around varied pile clusters, the author had found and summarized and concluded many scientific laws, which of flowing around pile cluster effect on the uniform water flow, the natural and extent＇s disparity of varied pile cluster effect on the same uniform water flow, the area and range of flow regime influenced during flowing around varied pile clusters. And the influenced extent and scope of flowing around square pile cluster effecting on the uniform water flow are more than that of cylinder pile cluster. For a pile clus- ter, in the way of influenced extent and scope of flowing around the pile cluster, the ratio of obstruct the water flow are more than the density of pile lines, and Reynolds number influence the extent and scope of flowing around pile cluster in big degree. It is even more superiority that people adopt the small size pile than the big size pile about pile cluster on water conservancy project.