Research on hydrodynamic performance of a tubular turbine under tidal wave condition

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Wang, Z.^1 ; Feng, J.J.^1 ; Zhu, G.J.^1 ; Wu, G.K.^1 ; Luo, X.Q.^1

Institute of Water Resources and Hydro-electric Engineering, Xi'An University of Technology, Xi'an

710048, China^1

关键词: Flow charac-teristics;    Hydraulic characteristic;    Hydrodynamic performance;    Optimal operating point;    Pressure fluctuation;    Surface fluctuations;    Theoretical calculations;    Velocity gradients;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012092/pdf
DOI  :  10.1088/1755-1315/163/1/012092

来源: IOP

【 摘 要 】

Tubular turbine running environment will be affected by ocean tidal wave, under the influence of the tidal wave, the hydrodynamic performance of the tubular turbine and its water-energy conversion efficiency have become the focus of our research and discussion. This paper explores the mechanism of wave-current coupling under surface fluctuations, considering the influence of tidal wave flow and gravity influence in flow field and flow characteristics of tubular turbine. The study on the performance of the influence of hydraulic characteristics of tubular turbine under the condition of wave flow has been carried out. Results show that the wave flow conditions with considering gravity leads to mechanical runner blade be damaged by tidal wave of pressure fluctuation and cyclic extrusion, causing more serious than fatigue stress damage than no wave flow condition does which make this kind of fluid machinery practical fatigue life is reduced greatly. The condition of the wave flow condition is universal, which is one of the reasons that the actual service life is always smaller than the theoretical calculation life. Considering the case of wave flow, the calculated efficiency is larger than that without considering this condition, and the difference between the two is the maximum at the optimal operating point. In the hydraulic turbine flow passage, significant pressure and velocity gradient are generated in the vertical direction due to wave action, resulting in no longer symmetrical distribution of its position. The hydraulic characteristics in the runner are obviously different from those without flow.