低坎分流墩用于低佛氏水流消能的试验研究  

Experiments and Research on Employing Diversion Pier with Low Ridge to Dissipate Energy in Low Fr Current

作　　者：王海龙[1] 孙桂凯[2] 徐伟章[2] 

机构地区：[1]清华大学,北京100084 [2]广西大学,广西南宁530004

出　　处：《红水河》2003年第2期37-41,共5页Hongshui River

摘　　要：针对低佛氏数水流消能中存在的问题,提出了一种用于低佛氏数水流消能的新型消能工———低坎分流墩,并以左江水利枢纽的泄流条件为依据,进行二元水流试验研究,同时在整体水工模型上进行了典型流量的验证,结果表明:低坎分流墩能有效地将低Fr水流的摆动水跃转变为多轴漩滚,能改善下游水流流态,降低水流底流速,抑制水流紊动,削减水面波浪,减轻对河床及岸边的冲刷,消能、防冲效果好。由于其省去了分流墩后的护坦,经济效果明显,适于推广应用。A research is made through twodimensional flow experiments on a kind of new energy dissipater applied to low Fr current--diversion pier with low ridge, based on the discharge conditions of Zhuojiang hydrojunction. In the mean time, verification of the research is carried out on the integral hydraulic model under the condition of typical flow rate. The experiments and research show that this new kind of dissipater effectively improves the flow pattern at the down stream by changing the oscillating jump of the low Fr current into multiaxial vortex flow, reducing the flow velocity, constraining the flow turbulence, and leveling waves. This mitigates the scouring of the flow to the riverbed and banks. Furthermore, this new kind of dissipater is more economic as it save the safeguards, deserving popularizing in engineering practice.

关 键 词：低坎分流墩 低佛氏水流 消能工 水流流态 河床冲剧 

分 类 号：TV135.2[水利工程—水力学及河流动力学] TV653