Hydraulic performance optimization of bidirectional tidal power turbine
Wang Zhengwei1, Yang Xiaosheng2, Xiao Yexiang1
（1.State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China; 2.China Longyuan Electric Power Group, Beijing 100036, China)
Abstract：According to the recorded operation data in Jiangxia experimental tidal power station, the relation between the tidal level and the reservoir area water head was analyzed, and the change pattern of the tidal level with the operating parameters was then concluded. The hydraulic characteristics of the bidirectional bulb turbine under multiple operating conditions were investigated by 3D numerical simulation. Based on this, optimization design of a new bidirectional bulb turbine with the fixed flow passage size, including parameters (diameter ratio of runner to bulb, guide vane angle and guide vane/runner blade shape) redesign, was conducted. Key achievement of model units after model acceptance test was also available. The new type unit in Jiangxia tidal power station, unit 6#, in which the research outcome has been directly utilized, achieved stable operating for both forward and reversed generation，pumping and draw off. Moreover, comparing with other units equipped, there is an over 6% efficiency increase for both forward and reversed generation. Besides, turbine general performance has also been improved.
[1]Chiba K,Yasuda K,Nakamura K.Numerical solution of fiber suspension flow through a parallel plate channel by coupling flow field with fiber orientation distribution[J].Journal of Non-Newtonian Fluid Mechanics,2001,99(2/3):145-157.[2]Yasuda K,Mori N,Nakamura K.A new visualization technique for short fibers in a slit flow of fiber suspensions[J].International Journal of Engineering Science,2002,40(9):1037-1052.[3]Lin Jianzhong,Li Jun,Zhang Weifeng.Orientation distribution of fibres in a channel flow of fiber suspension[J].Chinese Physics,2005,14(12):2529-2538.[4]Krochak P J,Olson J A,Martinez D Mark.Fiber suspension flow in a tapered channel:The effect of flow/fiber coupling[J].International Journal of Multiphase Flow,2009,35(7):676-688.[5]Zhang Qihua,Lin Jianzhong,Wang Canxing.Orientation distribution of fibers immersed in a curved expansion duct[J].International Journal of Nonlinear Sciences and Numerical Simulation,2009,10(11/12):1585-1594.[6]李红,袁寿其,袁建平,等.基于泵内纸浆悬浮液数值计算的纸浆泵设计.江苏大学学报:自然科学版,2007,28(1):51-55.Li Hong,Yuan Shouqi,Yuan Jianping,et al.Stock pump design based on numerical simulation of pulp fiber suspension in pump[J].Journal of Jiangsu University:Natural Science Edition,2007,28(1):51-55.(in Chinese)[7]刘厚林,陆斌斌,谈明高,等.双流道泵内固液两相流动的数值模拟[J].排灌机械,2009,27(5):297-301.Liu Houlin,Lu Binbin,Tan Minggao,et al.Numerical simulation on solid-liquid two-phase flow in a double channel pump[J].Drainage and Irrigation Machinery,2009,27(5):297-301.(in Chinese)[8]Jeffery G B.The motion of ellipsoidal particles immersed in a viscous fluid[C]//Proceedings of the Royal Society of London,Series A,Containing Papers of a Mathematical and Physical Character.1922,102(715):161-179.[9]Yu Zhaosheng,Shao Xueming.A direct-forcing fictitious domain method for particulate flows[J].Journal of Computational Physics,2007,227(1):292-314.[10]Krushkal E M,Gallily I.On the orientation distribution function of nonspherical aerosol particles in a general shear flow-Ⅱ:The turbulent case[J].Journal of Aerosol Science,1988,19(2):197-211.
