Abstract:In order to investigate into the effects of guide vane opening on the performance and internal flow characteristics of a tubular hydro-turbine, a series of numerical simulations are performed using ANSYS CFX at three openings such as 1 550, 1 405 and 1 278 mm. Apart from considering the turbine operation head and efficiency, the pressure and velocity distributions in the cross-sections of flow channel, the pressure profiles on the gate vanes and runner blades are analyzed, too. It is found that 1 405 mm is the optimal opening at which the guide vane matches the runner in hydrodynamics exactly. Moreover the cavitating flow in the hydro-turbine is simulated at the best guide vane opening under three operating conditions, namely 0.8Q, 1.0Q and 1.2Q. It is identified that the head and efficiency are reduced significantly due to cavitation. The vapor volume fraction distributions in the runner and draft tube are observed. It is shown that cavitation severity is the least at 1.0Q the design flow rate. At 0.8Q, the cavitation in the runner is the most serious; while at 1.2Q, the cavitation zone extends to the draft tube from the runner.
康灿, 李利婷, 鲁国辉. 导叶开度对贯流式水轮机性能及流动特征的影响[J]. 排灌机械工程学报, 2016, 34(5): 406-413.
KANG Can, LI Liting, LU Guohui. Influence of guide vane opening on performance and flow characteristics of tubular hydro-turbine. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(5): 406-413.
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