Optimal design of close law for bulb tubular type turbine based on orthogonal design
Chen Yunliang, Xu Yong, Du Min, Yang Hua
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu, Sichuan 610065, China
Abstract：The power station of bulb tubular type turbine is the characteristics of low head and large discharge. The transient quality of unit is impacted greatly by the close law of gates and blades during the large fluctuation after load rejection. The objective function for the transient composed of the unit′s rotate speed rise, the water pressure at the gates′ front and the axial hydraulic thrust was established and corresponding weight coefficients were determined. The orthogonal design calculation suitable for multi-factor and multi-level was adopted to optimize the close law of unit. Specifying the first time of gates close, the second time, the inflection point of gates close and the close time of blades were appointed as factors. The orthogonal design calculation was implemented with four levels adopted for every factor. The results show that the transient quality such as the rotate speed rise, the water pressure at the gates′ front, the axial hydraulic thrust and the water pressure at the draft tubes′ inlet, are improved significantly under the optimal close law of gates and blades. The water hammer pressure in penstock and the vacuum degree at the draft tubes′ inlet can be decreased in the case of blades closed slowly. The rotate speed rise of unit and the axial backward thrust can be reduced notable too. A better close law can be obtained by the orthogonal design calculation so that the better transient of bulb tubular type turbine after load rejection would occur. It can provide guidance of ensuring safety and stable operation of power station.
陈云良, 徐永, 杜敏, 杨华. 基于正交设计的灯泡贯流式机组关闭规律优化[J]. 排灌机械工程学报, 2015, 33(4): 322-326.
Chen Yunliang, Xu Yong, Du Min, Yang Hua. Optimal design of close law for bulb tubular type turbine based on orthogonal design. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(4): 322-326.
[1]宋厚彬,李伟力,杨逢瑜. 轴径向支架安放角对灯泡贯流式水轮发电机通风结构的影响[J]. 江苏大学学报:自然科学版, 2013, 34(3): 281-286. Song Houbin, Li Weili, Yang Fengyu. Placement angle effect of axial and radial stent on ventilation structure in bulb tubular turbine [J]. Journal of Jiangsu University:Natural Science Edition, 2013, 34(3): 281-286.(in Chinese)[2]郑源,李玲玉,周大庆,等. 微水头灯泡贯流式水轮机支撑及导叶联合设计[J]. 华中科技大学学报:自然科学版, 2014, 42(9): 128-132. Zheng Yuan, Li Lingyu, Zhou Daqing, et al. Joint design of supports and guide vanes in micro head bulb turbine [J]. Journal of Huazhong University of Science and Techndogy:Natural Science Edition, 2014, 42(9): 128-132.(in Chinese)[3]黄中良,赵显忠,程云山. 特大型灯泡贯流式机组机电安装技术难点[J]. 水利水电科技进展, 2010, 30(1): 72-75. Huang Zhongliang, Zhao Xianzhong, Cheng Yunshan. Technical difficulties of installation of mechanical and electrical equipment for large scale bulb tubular turbine units [J]. Advances in Science and Technology of Water Resources, 2010, 30(1): 72-75.(in Chinese)[4]王正伟,杨校生,肖业祥. 新型双向潮汐发电水轮机组性能优化设计[J]. 排灌机械工程学报, 2010, 28(5): 417-421. Wang Zhengwei, Yang Xiaosheng, Xiao Yexiang. Hydraulic performance optimization of bidirectional tidal power turbine [J]. Journal Drainage and Irrigation Machinery Engineering, 2010, 28(5): 417-421.(in Chinese)[5]刘延泽,常近时. 重力场对灯泡贯流式水轮机流场分析及水力性能评估的影响[J]. 水利学报, 2008, 39(1): 96-102. Liu Yanze, Chang Jinshi. Influence of gravity on flow field analysis and hydraulic performance evaluation of bulb turbine [J]. Journal of Hydraulic Engineering, 2008, 39(1): 96-102.(in Chinese)[6]钱忠东,魏巍, 冯晓波. 灯泡贯流式水轮机全流道压力脉动数值模拟[J]. 水力发电学报, 2014, 33(4): 242-249. Qian Zhongdong, Wei Wei, Feng Xiaobo. Numerical simulation of pressure pulsation in the whole flow passage of bulb turbine [J]. Journal of Hydroelectric Engineering, 2014, 33(4): 242-249.(in Chinese)[7]王辉斌,莫剑,田海平,等. 灯泡贯流式水轮发电机组优化运行试验研究[J]. 水力发电学报, 2010, 29(6): 211-216. Wang Huibin, Mo Jian, Tian Haiping, et al. Experimental study of combined condition optimization in bulb-type hydro generating set [J]. Journal of Hydroelectric Engineering, 2010, 29(6): 211-216.(in Chinese)[8]沙锡林. 贯流式水电站[M]. 北京: 中国水利水电出版社, 1980.[9]常近时. 贯流式水轮机基本力特性的解析表达式[J]. 中国农业大学学报, 1996, 1(6): 71-73. Chang Jinshi. Analytical expressions of basic force cha-racteristics of bulb hydraulic turbines [J]. Journal of China Agricultural University, 1996, 1(6): 71-73.(in Chinese)[10]刘延泽,常近时. 灯泡贯流式水轮机装置甩负荷过渡过程基于内特性解析理论的数值计算方法[J]. 中国农业大学学报, 2008, 13(1): 89-93. Liu Yanze, Chang Jinshi. Numerical method based on internal character for load rejection transient calculation of a bulb turbine installation [J]. Journal of China Agricultural University, 2008, 13(1): 89-93.(in Chinese)[11]夏林生,程永光,张晓曦,等. 灯泡式水轮机飞逸过渡过程3维CFD模拟[J]. 四川大学学报:工程科学版, 2014, 46(5): 35-41. Xia Linsheng, Cheng Yongguang, Zhang Xiaoxi, et al. 3D CFD simulation of the runaway transients of bulb turbine [J]. Journal of Sichuan University:Engineering Science Edition, 2014, 46(5): 35-41.(in Chinese)[12]陈云良,伍超,鞠小明,等. 灯泡贯流式电站机组及下游河道的水力过渡过程计算[J]. 四川大学学报:工程科学版, 2004, 36(3): 28-31. Chen Yunliang, Wu Chao, Ju Xiaoming, et al. Calculation of transients flow in units and downstream channel for power station of bulb tubular type turbine [J]. Journal of Sichuan University:Engineering Science Edition, 2004, 36(3): 28-31.(in Chinese)[13]苏沛兰,廖华胜. 基于正交设计的掺气坎体型设计数值模拟研究[J]. 水动力学研究与进展, 2011, 26(2): 217-227. Su Peilan, Liao Huasheng. Investigation of numerical simulation for aerator shape based on orthogonal design [J]. Journal of Hydrodynamics, 2011, 26(2): 217-227.(in Chinese)[14]Wylie E B, Streeter V L. Fluid Transients[M]. New York: Mc Graw-Hill Book Company, 1978.
