Study On The Influence Of Aerodynamic Performance Of Large Dual-wind Turbine

Wind energy is one of the renewable and non-polluting clean energy sources.Its flow direction cannot be determined and the amount of energy contained is unpredictable.Wind power generation technology is a relatively mature technology for wind energy utilization.In order to use wind energy more efficiently,it is necessary to increase the wind energy utilization rate of the wind turbine itself.In this word,a large dual-wind turbine is designed using the NH1500 kW wind turbine as the original model.The power characteristics and design parameters of the large dual-wind turbine are studied on the aerodynamic performance of the large dual-wind turbine.The specific contents and conclusions are as follows:(1)The work needs to design a small wind wheel that rotates coaxially with the NH1500 kW wind turbine in the same direction and at the same speed as the auxiliary wind wheel.The specific design results are as follows: The auxiliary wind wheel is mainly used to capture the wind energy that is not available to the root part of the main wind wheel,and the auxiliary wind wheel is designed.The rated power is134 kW and the radius is 13 m.According to the solidity of the wind wheel,the calculation result of the number of blades and the selection table of the number of blades,set the number of auxiliary wind turbine blades to five kinds of 8,9,10,11,and 12.The pitch of the wind wheel is 3.2m,and the azimuth is 0°.The basic parameters of the auxiliary wind wheel are given,and a double wind wheel model is established.(2)Simulate the original wind wheel,the auxiliary wind wheel and double wind wheel models by CFD method,and comparatively analyze the power output of the double wind wheel wind turbine to obtain the following conclusion: analysis of the five double wind wheel models found that the number of secondary wind wheel blades is 10 The output power of the double wind wheel is the largest,so it is determined to be the double wind wheel model studied in this paper;the comparative analysis of the original wind wheel and the double wind wheel model shows that the lower the wind speed,the greater the increase in the output power of the double wind wheel.In the current situation,the output power of the double wind wheel is increased by 8.98%,and the wind energy utilization rate is increased by 3.50%.Comparative analysis of the main and auxiliary wind wheels operating separately from the double wind wheel model,the higher the wind speed,the more the increase in output power of the doublewind wheel The output power is relatively increased by 1.56% and the wind energy utilization is relatively increased by 6.65% at rated operating conditions;the presence of the auxiliary wind wheel makes the incoming wind speed of the main wind wheel blade 15 m to 20 m area greater than the original wind wheel,the blade pressure in this area The relative pressure difference between the surface and the suction surface is greater than that of the original wind wheel;the flow separation in the area of ??8.5m to 13 m of the main wind wheel blade is relatively delayed;the kinetic energy in the wake of the double wind wheel is less than that of the original wind wheel.(3)Analyzing the influence of two wind wheels' azimuth angle on the output power of the whole machine,and obtain the following results: define the azimuth angle between the two wind wheels as,and the azimuth angle changes from 0° to 24°,It is defined as the first azimuth angle.With the increase of the first azimuth angle,the output power of the whole machine first increases and then decreases.When the azimuth angle is,the wind speed of the main wind turbine is the largest,the output power of the wind turbine is the largest,and the wind energy utilization The highest efficiency;relative to the model,the relative increase in the output power of the model gradually decreases.The maximum increase in power at 3m / s wind speed is8.68%,and the relative increase in power at rated wind speed is 1.52%;as the azimuth increases,The wind speed on the pressure surface of the 15 m to 20 m area of the main wind turbine blade increases,the pressure on the blade pressure surface decreases,and the blade pressure difference decreases.The three blades of the main wind turbine are superimposed to obtain an increase in pressure on the pressure surface of the main wind turbine.The pressure difference increases.This work designs a large-scale double-wind turbine,studies the aerodynamic performance of the double-wind turbine,and analyzes the influence of the azimuth of the wind turbine on the double-wind turbine.By adding wind turbines,the wind energy utilization efficiency of the whole machine is improved,which provides a reference for the design and optimization of double wind turbines.