论文部分内容阅读
利用高频PIV系统对风力机下游远至4.5倍风轮直径范围内的尾流数据进行了采集。首先通过脉动速度均方根云图分析,发现中心涡轨迹区域内粒子脉动轴向速度均方根大于叶尖涡轨迹区域,而叶尖涡轨迹区域内粒子脉动径向速度均方根大于中心涡区域;然后对比1、2、3、4倍风轮直径处所有径向位置的脉动合速度均方根,发现叶尖涡的耗散速度比中心涡要快,所以叶尖涡轨迹区域脉动合速度均方根比中心涡轨迹区域减小得快,同时发现了叶尖涡“交互跳跃”现象。
The use of high-frequency PIV system wind turbine downstream as far as 4.5 times the diameter of the rotor diameter data collected. First, by root mean square cloud analysis of pulsation velocity, it is found that the root mean square of particle pulsation velocity in the center vortex locus is larger than that of tip vortex locus, while the root mean square of particle pulsation radial velocity in tip vortex locus is larger than that of central vortex Then comparing the rms velocity root mean square of all the radial positions at the rotor diameters of 1, 2, 3, and 4, it was found that the tip vortex dissipated faster than the central one. Therefore, The root mean square decreases more rapidly than the central vortex locus, and at the same time the tip vortex “cross-jump” phenomenon is found.