Abstract:A numerical simulation method based on overlap grid, i.e. dynamic fluid body interaction(DFBI), was applied to study effects of diffuser on hydrodynamic performance of a marine current turbine in complex current environments in this paper. Since the overlap grid can remove topological constraints between objects and meshes, DFBI can simulate passive motion of a rigid body under action of fluid to realize the simulation of unsteady performance of a passively rotating current turbine. Particularly, the influences of diffuser on the hydrodynamic performance and the surrounding flow field around the turbine were analyzed under different flow conditions comparatively. The result shows that the met-hod used in the paper can accurately monitor the processes such as speed acceleration and rotor adaptive rotation and so on caused from the changes in current flow field around the turbine, and consequently investigating into unsteady performance of the turbine becomes realizable. An installed diffuser can increase the current velocity around the turbine by around 1.2 times, raise the turbine speed by 1.2-fold and improve the turbine power coefficient by about 35%. Under unsteady current flow conditions, the averaged power coefficient is reduced by about 33%. The diffuser can increase the turbine average rotational speed, but also can raise the average power coefficient by approximate 30%.
刘垚*, 卢蕊, 蔡卫军. 基于重叠网格的水轮机导流罩水动力特性[J]. 排灌机械工程学报, 2019, 37(7): 606-611.
LIU Yao*, LU Rui, CAI Weijun. Hydrodynamic performance of marine current turbine with diffuser based on overlap grid method. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(7): 606-611.
[1]EKELUND T. Yaw control for reduction of structural dynamic loads in wind turbines[J]. Journal of wind engineering and industrial aerodynamics, 2000,85(3):241-262.[2]WANG Shujie, XU Chao, YUAN Peng, et al. Hydrodynamic optimization of channelling device for hydro turbine based on lattice Boltzmann method[J]. Com-puters and mathematics with applications, 2011,61(12):3722-3729.[3]BATTEN W M J, BAHAJ A S, MOLLAND A F, et al. Hydrodynamics of marine current turbines[J]. Renewable energy, 2006,31(2):249-256.[4]BATTEN W M J, BAHAJ A S, MOLLAND A F, et al. Experimentally validated numerical method for the hydrodynamic design of horizontal axis tidal turbines[J]. Ocean engineering, 2007,34(7):1013-1020.[5]赵陈,刘羽,陈正寿,等. 潮流能水轮机叶片设计与计算[J].浙江海洋学院学报(自然科学版),2015,34(1):59-67. ZHAO Chen, LIU Yu, CHEN Zhengshou, et al. Design and computation about blades of tidal current turbine[J]. Journal of Zhejiang Ocean University(natural science), 2015,34(1):59-67.(in Chinese)[6]陈存福. 潮流能水平轴水轮机叶片优化及水动力性能研究[D]. 青岛:中国海洋大学, 2012.[7]CARRICA P M, SADAT-HOSSEINI H, STERN F. CFD analysis of broaching for a model surface combatant with explicit simulation of moving rudders and rotating propellers[J]. Computers and fluids, 2012,53(1):117-132.[8]赵发明,高成君,夏琼. 重叠网格在船舶CFD中的应用研究[J]. 船舶力学,2011,15(4):332-341. ZHAO Faming, GAO Chengjun, XIA Qiong. Overlap grid research on the application of ship CFD[J]. Journal of ship mechanics, 2011,15(4):332-341.(in Chinese)[9]王恋舟,郭春雨,苏玉民,等.自由度开放条件下螺旋桨激振力数值分析[J].哈尔滨工程大学学报,2017,38(6):822-828. WANG Lianzhou, GUO Chunyu, SU Yumin, et al. Numerical study of the propeller-induced exciting force under the open freedom condition[J]. Journal of Harbin Engineering University, 2017,38(6):822-828.(in Chinese)[10]CHAN W M, GOMEZ R J, ROGERS S.E, et al. Best practices in overset grid generation[C]//Proceedings of the 32nd AIAA Fluid Dynamics Conference and Exhibit. St Louis, USA: AIAA 2002-3191, 2002.[11]NOACK R W. SUGGAR: a general capability for moving body overset grid assembly[C]//Proceedings of the 17th AIAA Computational Fluid Dynamics Conference. Toronto, Canada: AIAA 2005-5117, 2005.[12]CARRICA P M, WILSON R V, NOACK R W, et al. Ship motions using single-phase level set with dynamic overset grids[J]. Computers and fluids, 2007,36(9):1415-1433.[13]王树杰,徐世强,袁鹏,等. 轴流式潮流能发电装置导流罩水动力特性研究[J]. 太阳能学报,2014,35(6):1098-1104. WANG Shujie, XU Shiqiang, YUAN Peng, et al. Study on hudrodynamic performance of diffuser for axial flow marine current energy converter[J]. ACTA energiae solaris sinica, 2014,35(6):1098-1104.(in Chinese)[14]王福军. 流体机械旋转湍流计算模型研究进展[J].农业机械学报, 2016,47(2):1-14. WANG Fujun. Research progress of computational model for rotating turbulent flow in fluid machinery[J]. Transactions of the CSAM, 2016,47(2):1-14.(in Chinese)[15]王树杰,盛传明,袁鹏,等.潮流能水平轴水轮机湍流模型研究初探[J].中国海洋大学学报,2014,44(5):95-100,113. WANG Shujie, SHENG Chuanming, YUAN Peng, et al. A study on turbulence models of horizontal axis tidal current turbines[J]. Periodical of Ocean University of China, 2014,44(5):95-100,113.(in Chinese)