调整段长度对侧式进/出水口水力特性的影响研究

Study on the Influence of Adjusting Section Length on Hydraulic Characteristics of Side Inlet or Outlet

调整段在抽水蓄能电站侧式进/出水口中起过渡水流作用,合理的调整段长度既可以减小工程投资,又可以改善进/出水口的水力特性。该文以某抽水蓄能电站侧式进/出水口为例,双向过流工况下,采用数值模拟方法,探究调整段长度对进/出水口水力特性的影响。研究表明:调整段仅对出流工况下进/出水口拦污栅断面流速分布有影响,一定长度的调整段可以改善拦污栅断面流速的均匀性;当调整段长度大于0.2倍扩散段长度时,拦污栅断面流速不均匀系数满足要求。

The adjustment section plays a transitional flow role in the side inlet or outlet of pumped storage power station.Reasonable length of the adjustment section can not only reduce the project investment,but also improve the hydraulic characteristics of the inlet or outlet.In this paper,taking the side inlet or outlet of a pumped storage power station as an example,the influence of the length of the adjusting section on the hydraulic characteristics of the inlet or outlet is explored by numerical simulation method under the bidirectional flow condition.The results show that the adjusting section only has influence on the velocity distribution of inlet or outlet trash rack section,and a certain length of adjusting section can improve the velocity uniformity of the trash rack section.When the length of the adjusting section is longer than 0.2 times of the length of the diffusion section,the velocity non-uniformity coefficient of the trash rack section meets the requirements.