In order to investigate the aerodynamic characteristics of Wind turbine tower under rated operating conditions, a 1:1 numerical model of 1.5MW wind turbine was established using UG finite element modeling software, and the velocity field and pressure field distribution of wind turbine with cross-sections of r / R = 20%, r / R =40%, r / R =60%, r / R =80%, r / R =120% and r / R =140% were analyzed. The results show that with the increase of r / R, the backflow and vortex on the leeward side of the tower are produced to different degrees, and the vortex separation point is shifted backward. With the increase of r / R, the pressure value and range about 0° symmetry axis gradually become smaller, and the pressure values on both sides of the tower show negative pressure and symmetric distribution, and the tail flow area of the tower gradually returns to the inlet pressure.
A numerical simulation calculation is performed using large eddy simulation method to investigate the characteristics of flow field around vehicle body, analyze the change rules of the velocity and pressure of the three-dimensional flow field around the vehicle body, as well as the frequency domain characteristics of the aerodynamic coefficients in the vehicle body. The results reveal that with the gradually expanding distance from the rear of the vehicle body, the velocity in the flow field around the vehicle body gradually recovers and reaches the incoming flow velocity at 0.9m from the rear of the vehicle body. Within the range of 0∼50HZ, the resistance coefficient and lift coefficient undergo a peak attenuation to about 20%, with a fluctuation of aerodynamic coefficient mainly within the range of 0∼500HZ. The research results are of certain significance and value for analyzing and applying the characteristics of flow field around vehicle body.
In this paper, the problems existing in the online teaching process of blended teaching are discussed. when the effective means to improve the quality of blended teaching are discussed, the method and practice of "results-oriented" online teaching design, the teaching organization form and interactive strategy of "learner-centered", and the formative evaluation and assessment method of "effective learning as the standard" are analyzed. In this way, this study provides some useful references for improving the quality of curriculum teaching in colleges and universities and for educators who pay attention to the reform of curriculum teaching.
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