一种确定侧式进/出水口分流墩间距的方法及试验验证

A Method and Test Verification for the Design of Separation Pier Spacing of Side Intake/Outlet

针对抽水蓄能电站侧式进/出水口扩散段分流墩的布置,根据NB/T 10072—2018《抽水蓄能电站设计规范》的建议值,一般采用分流墩在扩散段起始端的宽度比来设计分流墩间距。但在实际中经常发现,各孔流道分流并不均匀,特别是在扩散出流工况,难以满足设计要求。提出了一种确定侧式进/出水口分流墩间距的方法,采用各孔流道控制断面面积比确定分流墩间距。多个模型试验结果表明,相较于扩散段起始端的宽度比法,采用控制断面面积比的方法确定的分流墩间距更合理,能使各孔流道分流更均匀,利于减小进出水口的水头损失和确保拦污栅的安全运行。

According to the specification of“Code for Design of Pumped Storage Power Stations”(NB/T 10072—2018),the separation pier spacing of the side intake/outlet in pumped-storage station is generally designed by using the width ratio of the separation piers at the beginning of diffusion section.However,it is often found in practice that the flow distribution of each flow channel is not evenly uniform,especially in the operation condition of diffusive flow,which is difficult to meet the design requirements.To this end,a new method for determining the separation pier spacing of side intake/outlet is proposed,in which,the spacing is determined by controlling the cross-sectional area ratio of each flow channel.Several model tests show that the new method can effectively improve the flow distribution of each flow channel,greatly reduce head loss of intake/outlet,and ensure the safe operation of trash racks.