FL-12风洞突风试验装置研制

论述了在FL-12风洞研制的垂直和水平两种突风发生器,两者都是通过电机驱动凸轮、凸轮带动连杆使叶片摆动,改变电机的转速和凸轮的偏心距来产生叶片不同的频率和振幅,同时还介绍了两种突风发生器的优缺点、安装方法以及减振隔振措施。通过突风流场的测量,得出:突风区域内左右和上下位置突风流场变化较小,前后位置突风流场变化规律为离叶片越近,正弦规律越明显,突风流场越纯正;离叶片越远,正弦风速受干扰越大,突风流场越不纯正;正弦突风流场的风速幅值与来流风速、叶片个数、叶片摆动频率和测点距叶片的风洞轴向距离有关,并且都是正相关的关系。最后简要介绍了突风响应及减缓两期试验,试验结果表明:突风发生器能产生均匀的垂直和水平突风流场,突风频率和强度均可满足弹性模型突风试验要求,FL-12风洞具备了突风响应试验研究技术。

The development of gust generators in FL-12 wind tunnel

Horizontal and vertical gust generators have been developed in FL-12 wind tunnel,both of which consist of a group of oscillating vanes with electric-motor-driven cam gearing.By changing the rotation speed of motor and the eccentric distance of cam,gust field with different frequencies and amplitudes will be achieved.Advantages and disadvantages of both generators,the installation methods and vibration reduction measures are presented.From gust flow field measurement results,some conclusions are drawn including that(1) the change of flow field is little in vertical and lateral directions;and in longitudinal direction,closer to blades the position is,more obvious the sine discipline and purer the gust flow field is;(2) farther to blades,the sine wind speed is disturbed more greatly and gust flow field becomes more impure.Wind speed amplitude is relevant to mean speed,number of blades,oscillation frequency of blade,longitudinal distance between blades and measurement point,and all are positive correlation.And with the generators experimental research on gust response and alleviation was performed.The test results indicate that steady horizontal or vertical gust field can be induced by the corresponding gust generator,and the gust frequency and intensity are well meet the gust testing requirements of the elastic model.The gust response test technology has been developed in FL-12 wind tunnel.