阵风发生器流场特性分析与试验验证

为了有效安排试验以及进行数据分析,需要事先获知阵风发生器扰动流场特性.基于某型叶片阵风发生装置,对影响阵风强度及其分布形态的各种因素进行了深入细致的讨论,重点分析了叶片摆角幅值、振荡频率、来流风速以及叶片侧向间距的作用.数值模拟结果显示:上述敏感参数不同程度地影响了中心线各点阵风幅值.侧向阵风速度幅值在叶片下游各截面具有相似的分布形态,且在小攻角范围与叶片摆角幅值保持线性变化.因此选定来流风速和振荡频率后,调节叶片摆角幅值较易获得期望的阵风强度.风洞试验表明:阵风发生器特性分析具有实用价值.

Flow field analysis and experimental investigation on gust generator

It is necessary to obtain the disturbance flow field characteristic of a gust generator beforehand in order to efficiently arrange experiment and analyze data. A variety of factors that had effects on the intensity and distribution of the gust were discussed based on a certain type of gust device, with emphasis on the vane amplitude, the oscillation frequency, the freestream speed, and the vane lateral spacing. The numerical simulation results show that the mentioned sensitive parameters influence gust intensity measured at points on the centerline more or less. The gust peak values at lateral sections downstream from the vanes have similar distribution shape, and vary linearly with the vane oscillation amplitude within a range of small angle of attack. Therefore, the anticipant gust intensity can be achieved expediently by adjusting the vane oscillation amplitude under the selected freestream speed and frequency. The wind tunnel experiment demonstrates that the performance analysis of the gust generator is of practical value.