Prediction Of Aerodynamic Characteristics For Wind Turbine Under Yaw Condition By Panel Method

With the increasingly serious energy and environment problems, clean and renewable energy is cherished. As a kind of clean energy, wind power with good prospects and development potential to be the first choice of most countries. Our country is rich in wind resources, and to develop the wind is in conformity with the sustainable development strategy of our country. Then wind energy technology received more attention. In recent years, the research of wind turbine aerodynamic performance get more and more attention, the aerodynamic theory is gradually applied to the aerodynamic design of wind turbine.At actual wind field, the wind direction are always changing, which result the horizontal axis wind turbine work in the working condition of yaw angle in most cases. Yaw angle operation makes the wind turbine aerodynamic performance is more complex, the study of the aerodynamic characteristics of the wind turbine working in yaw angle conditions is urgent and important. In this paper, the MEXICO rotor aerodynamic characteristics working in yaw angle conditions was quickly predicted use a Fortran calculation procedure which based on panel method. The panel method need fewer computer resources. And compared with experimental data analysis, the prediction accuracy can be further improve.The panel method combined with prescribed wake can be more rapid predict wind turbine aerodynamic performance. Combined with theory and experiment, a wind turbine wake model was proposed in this paper presents, and verified the accuracy of the trail. At the same time, the contrast analysis of the equal pressure Kutta condition and Morino Kutta condition was carried out, and equal Kutta Condition was chosen finally.In this paper, the aerodynamic performance of MEXICO rotor working in different yaw angle and different wind speed was calculated. The pressure coefficients of 35%,60%,82%and 92% blade sections were compared between calculation and experimental date. It turned out that the results calculated by panel method is good agreement with experimental date. The maximum error appears in the 35% blade section. The reason is that the angle of attack is bigger in the 35% blade section, than flow separation situation of trailing edge is serious, which cannot predicted by panel method. The calculated error from blade root to blade tip is becoming more and more small. The pressure coefficients calculated by panel method and 传统 CFD are compared with experimental date, the results show that the panel method is more accurate in low speed.Compare the pressure coefficients of different blade sections with different yaw angle while the wind speed is 15m/s. It is turned out that the pressure coefficient distribution consistent with the distribution in 15°. Maximum pressure coefficient is unchanged in different yaw angle. However, with the yaw angle decreasing, the minimum pressure coefficient of suction surface is decreased, and the position of minimum pressure coefficient is moved to the leading edge of blade. Similarly, the pressure coefficients calculated by panel method and 传统 CFD are compared with experimental date, and the results show that the panel method is more accurate in small yaw.