多风扇主动控制风洞类平板断面抖振力识别研究

Buffeting force analysis of thin plate section in multiple fans active control wind tunnel

针对目前一般的大气边界层物理风洞采用被动格栅产生的紊流脉动风场功率谱密度能量分布难以调整以及积分尺度过小的问题,借助于主动控制方法善于改变来流功率谱及积分尺度的特点,利用日本宫崎大学多风扇主动控制风洞调试出多种宽带紊流风场和谐波脉动风场,采用脉动风速和气动力同步采集监控装置,使用测量稳定性好、精度较高的节段模型高频天平测力方法识别类平板模型的抖振力,对影响模型抖振力的主要参数(积分尺度、紊流度、攻角等)进行分析。

In the wind tunnel test with atmospheric boundary,the difficulty in regulation of the power spectral density of turbulent wind,simulated passively by the grid layer,and the problem of smaller integral length of turbulence often appear.So the advantage of active control was taken to adjust the power spectral density as well as the integral length.Multiple fans wind tunnel in Miyazaki of Japan were used to debug many kinds of broadband turbulent winds and harmonic fluctuating winds.The high frequency force balance method was adopted for better stability and precision to measure the buffeting force of thin plate section with the testing of fluctuating wind synchronously.On this basis,the influences of various parameters(integral length,turbulence intensity,attack angle etc) were analyzed.