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.
[1]朱多彪,李龙,沈云. 基于升力法的贯流式水轮机叶片设计及可行性分析[J].水电能源科学,2013, 31(7):158-161. ZHU Duobiao, LI Long, SHEN Yun. Feasibility analysis and design for tubular turbine blade based on lifting design method[J]. Water resources and power, 2013,31(7):158-161.(in Chinese)[2]LUO Yongyao, WANG Zhengwei, ZHOU Lingjiu, et al. Computation of static and dynamic stresses of a bulb tubular turbine[C]//Proceedings of FEDSM2008. Jacksonville, USA: ASME, 2008:1187-1191.[3]KIM Y T, NAM S H, CHO Y J, et al. Tubular-type hydroturbine performance for variable guide vane opening by CFD[C]//Proceedings of the Fifth International Conference on Fluid Mechanics. Beijiang: Tsinghua University Press & Springer, 2007:424-427.[4]梁维燕,尹新善.贯流式水轮机导水机构的最优化设计[J].大电机技术,2012(4):35-38. LIANG Weiyan, YIN Xinshan. Through flow turbine water guide mechanism optimization design[J]. Large electric machine and hydraulic turbine, 2012(4):35-38.(in Chinese)[5]SHIELS S. Centrifugal pump academy: Causes of intermittent and chronic cavitation[J]. World Pumps, 1998,1998(380):57-60.[6]胡影影,朱克勤,席葆树.翼型空化绕流数值研究[J].力学季刊,2003,24(4):572-576. HU Yingying, ZHU Keqin, XI Baoshu. Numerical study of cavity flow around a hydrofoil[J]. Chinese quarterly of mechanics, 2003,24(4):572-576.(in Chinese)[7]QIAN Y, SUZUKI R, ARAKAWA C. Analysis of the performance of a bulb turbine using 3-D viscous numerical techniques[J/OL]. Hydraulic machinery and cavitation,1996:220-229 [2015-09-17]. http://link.springer.com/chapter/10.1007%2F978-94-010-9385-9-21. DOI: 10.1007/978-94-010-9385-9-21.[8]刘树红,杨魏,吴玉林,等.贯流式水轮机三维定常湍流计算及改型设计[J].水力发电学报,2007,26(1):110-113,118. LIU Shuhong, YANG Wei, WU Yulin, et al. 3-D steady turbulent simulation and modification of the tubular turbine[J]. Journal of hydroelectric engineering, 2007,26(1):110-113,118.(in Chinese)[9]SINGHAL A K, ATHAVALE M M, LI Huiying, et al. Mathematical basis and validation of the full cavitation model[J]. Journal of fluids engineering, 2002,124(3):617-624.[10]董开松,赵耀,李臻,等.贯流式水轮机定常流动分析[J].大电机技术,2015(1):39-43,47. DONG Kaisong, ZHAO Yao, LI Zhen, et al. Steady flow analysis of bulb turbine[J]. Large electric machine and hydraulic turbine, 2015(1):39-43,47.(in Chinese)[11]ZHOU Lingjiu, WANG Zhengwei, XIAO Ruofu, et al. Analysis of dynamic stresses in Kaplan turbine blades[J]. Engineering computations, 2007,24(8):753-762.[12]欧阳振宇,张立翔. 贯流式水轮机三维非定常流DES数值模拟[J]. 机械与电子,2014(6):48-51. OUYANG Zhenyu,ZHANG Lixiang. Simulation of three-dimensional unsteady flows in a tubular hydro-turbine on detached eddy simulation[J]. Mechinery and electronics, 2014(6):48-51.(in Chinese)[13]黄剑峰,张立翔,王文全,等. 混流式水轮机三维非定常流分离涡模型的精细模拟[J]. 中国电机工程学报, 2011,31(26):83-89. HUANG Jianfeng, ZHANG Lixiang, WANG Wenquan, et al. Fine simulation of 3-D unsteady flows in a francis hydro-turbine on detached eddy simulation[J]. Proceedings of the CSEE, 2011,31(26):83-89.(in Chinese)[14]马希青,陈明辉,孙聪. 灯泡贯流式水轮机转轮内流场的研究[J]. 机电产品开发与创新,2014,27(1):73-74,83. MA Xiqing, CHEN Minghui, SUN Cong. Study on flow field of bulb turbine runner[J]. Development & innovation of machinery & electrical products, 2014,27(1):73-74,83.(in Chinese)[15]李凤超,樊红刚,王正伟,等. 贯流式机组桨叶与导叶全三维匹配设计方法[J]. 水力发电学报,2010,29(4):213-218. LI Fengchao, FAN Honggang, WANG Zhengwei, et al. Three-dimensional matching design method for runner blades and guide vanes of tubular turbine[J]. Journal of hydroelectric engineering, 2010,29(4):213-218.(in Chinese)
