水资源与水工程学报2023，Vol.34Issue(6)：156-163,8.DOI:10.11705/j.issn.1672-643X.2023.06.19
长引水道高水头电站不同负荷条件甩荷对蜗壳压力的影响研究
Load rejection conditions affect pressure in spiral case of hydropower station with long diversion channel under high water head
蔡付林 1周骏 1周建旭 1樊子凯1
作者信息
- 1. 河海大学 水利水电学院,江苏 南京 210098
- 折叠
摘要
Abstract
The hydraulic conditions of hyropower stations with long diversion channels and high water head are complicated,it is necessary to clarify the extreme pressure conditions in the spiral case of the power units under centralized water supply arrangement and the intrinsic influencing mechanism.Assum-ing the water levels of the upstream and downstream of the hydropower plant are the same,we carried out simulation calculations for the transient process of the load rejection conditions of single and double power units under different loads using the method of characteristics(MOC),Simplex which can track the unit operation trajectory and the system state equation.The results show that the single unit and double units operating at 20%of the rated power are subjected to first-phase water hammer after load rejection,which is the extreme pressure condition in the inlet section of the spiral case.The study also shows that the ex-treme value of water pressure in the inlet section of the spiral case occurs in the case of partial load rejec-tion when the guide vane operates at small opening.The initial pressure value and the extreme value in the inlet section of the spiral case are related to the unit load,the less the initial output of the unit,the smaller the head loss in the diversion system,the higher the initial pressure of the unit,and the higher the value of the water pressure in the inlet section of the spiral case after load rejection,and the slower the pressure decay after rejecting partial load.The operating mode of the power units has a certain effect on the extreme value of water pressure in the inlet section of the spiral case and its peak time.The re-search results can provide some reference for the design,operation and maintenance of the same type of hydropower stations.关键词
长引水道高水头电站/蜗壳压力/甩负荷/过渡过程/特征线法/控制工况Key words
hydropower station with long diversion channel under high water head/pressure in spiral case/load rejection/transient process/method of characteristics(MOC)/control condition分类
建筑与水利引用本文复制引用
蔡付林,周骏,周建旭,樊子凯..长引水道高水头电站不同负荷条件甩荷对蜗壳压力的影响研究[J].水资源与水工程学报,2023,34(6):156-163,8.
