【作者】 李广宁；

【导师】 高学平；

【作者基本信息】 天津大学 ， 水力学及河流动力学， 2010， 硕士

【摘要】 抽水蓄能电站运行灵活、可靠,除调峰填谷外,还适合承担调频、调相、事故备用等任务。目前,中国已建的抽水蓄能电站在各自的电网中都发挥了重要作用。近年来,随着电力需求不断增长,电力系统的调峰填谷的需求也越来越大,因此建设调峰填谷和动态经济效益好的抽水蓄能电站很有必要。抽水蓄能电站进/出水口分为侧式与竖井式两种。在我国,侧式进/出水口应用较为广泛,竖井式进/出水口较少。本文利用k ??紊流模型对丰宁抽水蓄能电站上水库侧式进/出水口水力特性进行三维数值模拟研究。首先针对丰宁抽水蓄能电站上水库侧式进/出水口原设计方案(体型一和体型二),利用三维k ??紊流模型,进行了抽水和发电典型工况下进/出水口的三维数值模拟。分析比较了两设计方案进/出水口的水头损失、流速分布以及各孔口的流量分配特点等水力特性。在原设计方案基础上,通过改变扩散段顶板纵向扩散角进行体型优化。计算结果表明,扩散段顶板纵向扩散角减小对抽水工况(出流)流态有改善作用。扩散段顶板纵向扩散角是影响水流不均匀系数和分离区域的主要原因之一。更多还原

【Abstract】 The operation of pumped-storage power plants is both flexible and reliable. Besides the functions of filling valley and modulating peak, it undertakes many other tasks such as frequency modulation, phase modulation, emergency reserve etc. At present, the available pumped-storage power plants in China have demonstrated increasing importance in their own power network. In recent years, with the growing demand for electricity, the need for filling valley and modulating peak of the power system has been growing. Therefore, it is necessary to build the Pumped-storage power plants that can not only well fill valley and modulate peak but also can achieve the dynamic economic benefits. Pumped-storage power plants can be divided into plants with side inlet/outlet and vertical inlet/outle according to the forms of inlet and outlet. In China, the side inlet/outlet has a wide adoption with less extensive adoption in vertical inlet/outle.This paper describes mainly the side inlet/outlet of the upper reservoir of Fengning pumped-storage power plant. The hydraulic characteristics of the side inlet/outlet in the upper reservoir are analoged with three-dimensional k-εturbulent model.First,the original project of the side inlet/outlet of the upper reservoir of Fengning pumped-storage power station(type 1 and type 2) is investigated with three-dimensional k-εturbulent mode in the pumped condition and powering condition. The analysis and comparison of hydraulic characteristics, including head loss, flow distribution and velocity distribution,On the basis of the original project, to change the vertical diffusion angle of the diffusion portion to Optimize the project. The vertical diffusion angle plays an important role in modulating the water flow. The shrink of the diffusion angle can greatly optimize the asymmetry parameter of the velocity and the separation of the water flow in a certain degree.更多还原