Experimental Study On Hydrodynamic Performance Of Vertical Shaft Turbine With Blade Punching Density

The tidal current power generation device is the main equipment that uses the tidal current power generation.Its efficiency reflects the merits of the device.In order to improve the utilization of tidal current energy,the turbine,an important part of the device,has naturally become the main research object of people.The energy utilization rate of ordinary vertical axis turbines is very low.The key part of the turbine is the direct impact on the energy utilization rate of the turbines.Therefore,this paper explores and analyzes the blades of vertical axis turbines,and through experiments to explore the effects of blades with different opening densities on the hydrodynamic performance of turbines.The specific research content is:(1)Mainly analyzes the conventional classification of turbines for tidal current energy collection equipment,and systematically introduces the research progress of domestic and foreign hydraulic turbines and new types of turbines;(2)The force analysis of the blades of the vertical axis hydraulic turbine was performed.Some basic parameters and airfoil of the blades were classified.The parameters affecting the hydrodynamic performance of the turbine were dimensionlessly processed.Finally,the vertical axis used in the experiments in this paper was determined.Shaft turbine size;(3)Design of experimental platform and experimental scheme.Design the experimental platform according to the existing equipment conditions in the laboratory and determine the platform size.After designing the experimental platform,determine the instruments and equipment needed for the experiment according to the relevant data,select the equipment,determine the parameters and ranges of the instrument,and finally design the experimental scheme and determine the experimental conditions;(4)Research on pool experiments and numerical simulations.Mainly carried out pool experiments and numerical simulations of conventional blades,and the measurement of resistance torque of hydraulic turbine models.The results of numerical simulation and pool experiments show that the trends of the two curves are basically the same,and the tip speed ratio is very close when the maximum value is reached;(5)Experimental research on ponds with different opening densities.The conventional water turbine blades were used as the control group,and four different numbers of open-density blades were used as the experimental group for the poolexperiments.The number of open holes was two,four,six,and eight,respectively.The effect of 5 kinds of blades on the performance of hydraulic turbine under the same conditions was obtained.The results show that the highest overall efficiency is conventional blades,followed by two-opening blades,four-opening blades,followed by six-opening blades and eight-opening blades,indicating that the overall efficiency of the hydraulic turbine increases with the number of openings.The smaller the blade openings do not increase the efficiency of the turbine.