【摘要】：抽水蓄能電站作為一種儲能方式在電力系統(tǒng)中發(fā)揮著重要作用。水泵水輪機作為抽水蓄能電站的核心部件,其啟動到并網暫態(tài)過程的研究對水輪機工況下機組最優(yōu)啟動方式的探索有重要意義。本文以某模型水泵水輪機為研究對象,主要研究該機組從導葉關閉狀態(tài)到某較大開度狀態(tài)的過渡過程中活動導葉受力狀態(tài)。通過三步計算,漸進式的研究導葉開啟過程中導葉水力矩與徑向力的變化,揭示其力特性。先定常模擬導葉開啟過程中的幾個開度的流場,對其受力進行分析。并發(fā)現導葉兩側表面壓力分布直接影響導葉受到的徑向力和水力矩大小。再進行非定常模擬導葉從關閉狀態(tài)到某較大開度的全過程,分析活動導葉的受力過程。此非定常仿真針對引水部件,并通過UDF給定導葉開啟規(guī)律。研究發(fā)現,隨導葉開啟徑向力與水力矩系數不斷減小,徑向力方向隨導葉開啟發(fā)生一定改變,且不同位置導葉徑向力方向角改變量不一致。當導葉開啟到一定開度,流量出現波動。流量的波動,周期性的影響流道內的局部壓力,從而使導葉力特性受到周期性影響。最后非定常模擬整個機組導葉開啟過程中的流場。計算中使用UDF控制流量邊界條件,模擬流量隨導葉增大而增大。并在動網格控制導葉開啟的基礎上,使用6 DOF控制轉輪運動,從而得到了幾個開度下短時間內導葉開啟過程中的流場。分析發(fā)現導葉受力規(guī)律與前兩步仿真基本一致,不同在于計算中壓力波動較大。
[Abstract]:Pumped-storage power station plays an important role in power system as a kind of energy storage method. As the core component of pumped-storage power station, the research on the transient process from start-up to grid connection is of great significance to the exploration of the optimal start-up mode of turbine units. In this paper, a model pump turbine is taken as the research object, and the force state of the guide vane during the transition from the guide vane closing state to a larger opening state is mainly studied. Through three-step calculation, the variation of guide vane water moment and radial force during the process of guide vane opening is studied, and the force characteristics are revealed. The flow field of several openings in the opening process of the guide vane is simulated and the force is analyzed. It is also found that the surface pressure distribution on both sides of the guide vane directly affects the radial force and the water moment of the guide vane. Then the unsteady simulation of the whole process from the closing state to a larger opening of the guide vane is carried out to analyze the force process of the moving guide vane. The unsteady simulation is aimed at the diversion components and the opening rule of the guide vane is given by UDF. It is found that with the decreasing of radial force and water moment coefficient, the radial force direction changes with the opening of the guide vane to a certain extent, and the radial force direction angle of the guide vane varies in different positions. When the guide vane opens to a certain opening, the flow rate fluctuates. The fluctuation of flow rate periodically affects the local pressure in the flow channel, which makes the force characteristics of the guide blade periodically affected. Finally, unsteady simulation of the flow field in the process of the guide vane opening of the whole unit is carried out. UDF is used to control the flow boundary condition, and the simulated flow increases with the increase of the guide vane. On the basis of moving grid control guide vane opening, 6 DOF is used to control runner motion, thus the flow field in the process of guide vane opening in a short time is obtained under several openings. It is found that the force law of guide vane is basically the same as that of the first two steps, except that the pressure fluctuates greatly in the calculation.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV136

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