侧式进/出水口各孔道流量分配差异及影响因素  

Differences and Influencing Factors of Flow Distribution at Each Channel in Side Inlet/Outlet

作　　者：高学平[1] 马一鸣 刘殷竹 朱洪涛[1] Gao Xueping;Ma Yiming;Liu Yinzhu;Zhu Hongtao(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学水利工程智能建设与运维全国重点实验室,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2024年第6期633-641,共9页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(52179077).

摘　　要：对于抽水蓄能电站侧式进/出水口各孔道流量分配,现有设计规范规定进/出水口相邻中边孔道的流量不均匀程度不宜超过10%,但实际工程设计难以达到此要求.本文以某抽水蓄能电站侧式进/出水口为例,通过优化进/出水口各体型参数,利用数值模拟方法研究各孔道流量等水力参数,重点分析分流墩布置对各孔道流量分配的影响及其规律,试图使进流工况和出流工况相邻中边孔道的流量不均匀程度均最小.研究表明,改变扩散段分流墩布置能有效改善流量不均匀程度.对于3墩4孔侧式进/出水口,相邻中边孔道的流量不均匀程度在出流工况下随中边孔宽度比增大而增大,在进流工况下随中边孔宽度比增大而减小;当中边孔宽度比增大且中墩后移距离减小时,出流工况和进流工况下的流量不均匀程度均减小.对于2墩3孔侧式进/出水口,相邻中边孔道的流量不均匀程度不论在出流工况下还是在进流工况下,均随中边孔宽度比增大呈先减小后增大的规律.优化后的3墩4孔侧式进/出水口的中边孔宽度比取0.228∶0.272,中墩后移距离取0.36D(D为隧洞直径),其相邻中边孔道的流量不均匀程度均较优,在出流工况下为18.47%~19.43%,在进流工况下为19.82%~19.83%;优化后的2墩3孔侧式进/出水口的中边孔宽度比取0.310∶0.345,其相邻中边孔道的流量不均匀程度均较优,在出流工况下为19.47%~19.63%,在进流工况下为18.66%~18.67%.相邻中边孔道的流量不均匀程度较难满足不宜超过10%的设计规范要求.研究成果将有助于《抽水蓄能电站设计规范》中关于进/出水口水力指标要求的完善.For the flow distribution of each channel in the side inlet/outlet of a pumped storage power station,the existing design code stipulates that the flow non-uniformity of middle and side channels adjacent to the inlet/outlet should not exceed 10%.However,the actual engineering design is difficult to meet this requirement.In this paper,the side inlet/outlet of a pumped storage power station is taken as an example.By optimizing the shape parameters of the inlet/outlet,the hydraulic parameters such as the flow rate of each channel are studied using the numerical simulation method.The influences of the arrangement of diversion piers on the flow distribution of each channel and the corresponding law are analyzed in detail,with an aim of minimizing the flow non-uniformity of adjacent middle and side channels under inflow and outflow conditions.The research shows that changing the arrangement of diversion piers in the diffusion section can effectively improve the flow non-uniformity.For a 3-pier 4-channel side inlet/outlet,the flow non-uniformity of adjacent middle and side channels will grow with an increase in the width ratio between middle and side channels under outflow conditions,but it will decline under inflow conditions.In addition,when the width ratio increases and the backward distance of the middle pier decreases,it will decline under both the outflow and inflow conditions.For a 2-pier 3-channel side inlet/outlet,the flow non-uniformity of adjacent middle and side channels will decline first and then grow with the increasing width ratio,regardless of the outflow or inflow conditions.After the optimization,when the width ratio of the 3-pier 4-channel side inlet/outlet is 0.228∶0.272 and the backward distance of the middle pier is 0.36D(where D is the tunnel diameter),the flow non-uniformity of adjacent middle and side channels will be better,i.e.,it will be in the ranges of 18.47%-19.43% and 19.82%-19.83% under outflow and inflow conditions,respectively.In comparison,when the width ratio of the optimized 2-pie

关 键 词：抽水蓄能电站 侧式进/出水口 体型优化 流量分配 数值模拟 

分 类 号：TV131[水利工程—水力学及河流动力学]