一种移动式集风装置的性能分析

Performance Analysis of A Kind of Movable Wind-drive Device

为了提高风能利用率,扩大风力发电系统的风速利用范围,提出了一种沿轨道移动的收缩管状集风装置,并对其性能进行了研究。当风速较小时,气流在收缩管中加速,提高了风能密度,降低了风力机的启动风速;在风速较大时,收缩管受到较大的风压力沿轨道向后移动,装置内风力机处增加的风速较小,使风力机可以继续正常工作。从风速均匀稳定变化的角度出发,分析了气流马赫数随直径变化的关系;基于连续性方程和伯努利能量方程,考虑收缩管移动时开槽缝隙的影响和流动过程中的能量损失,对连续性方程进行修改,用来描述风速变化在装置内部的动态特性。数值模拟和实验结果表明,移动式集风装置可以减小其内部的风速波动,增加风能利用率和扩大发电系统的风速利用范围。

To enhance the utilization rate of wind energy and enlarge the speed range of Wind Power Generation System, a kind of Wind-drive Device with a constricted tube is introduced.When the wind speed is small,the wind speed increases in the constricted tube,so this device improves the wind energy density and decreases the threshold wind velocity. When the wind speed is large, the device moves backward and the wind speed blowing the wind turbine blade increases not much,so wind turbine still can work normally.From the perspective of wind speed changes,the relation between Mach number and the diameter is analyzed.Based on the continuity equation and bernoulli equation,considering the influence of crevice on the constricted tube,we modified the continuity equation to describe dynamic characteristics of wind speed within the device.Numerical simulation and experiment results expressed that the device can reduce wind velocity fluctuations,improve the wind energy density and expand the range of Wind Power Generation System.