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在中国航空工业空气动力研究院FL-5低速风洞进行了80°三角翼流动显示和涡频测量试验研究。介绍了能产生扫描式6片光的旋转镜平行多片光装置;介绍了能产生连续、均匀的示踪粒子且粒子浓度可调的气压式粒子发生器;介绍了测量涡跳动频率的光学方法和用应变天平测量模型抖动频率的方法,并对大迎角和大滚转角时涡跳动频率和模型抖动频率进行了测量,结果表明:α=42°、=42°时模型抖动频率(7.2Hz)和涡跳动频率(7.75Hz)接近,模型的抖动可能是由前缘涡的非定常跳动引起的;介绍了流动图像处理的相位平均技术,该技术可用于动态流动显示和测量,并可对动态迟滞效应进行定量分析;介绍了流动显示图像的三维重建技术,该技术可用于显示空间涡的结构并分析其机理。
The 80 ° delta wing flow display and vortex frequency measurement experiment were carried out at the FL-5 low speed wind tunnel of CAE Aeronautical Institute. A rotating mirror parallel multi-slice optical device capable of generating a scanning 6-slice light is introduced. A pneumatic particle generator capable of generating continuous and uniform tracer particles with adjustable particle concentration is introduced. An optical method for measuring the frequency of vortex shedding is introduced And the jitter frequency of the model was measured by strain balance. The vortex frequency and model jitter frequency at high angle of attack and large roll angle were measured. The results showed that the model jitter frequency at 7.2 = 42 ° and 7.2 Hz) is close to the vortex frequency (7.75Hz), the jitter of the model may be caused by unsteady runout of the leading edge vortex. The phase averaging technique of flow image processing is introduced, which can be used for dynamic flow display and measurement. The dynamic hysteresis effect is quantitatively analyzed. The three-dimensional reconstruction technology of flow display image is introduced, which can be used to display the structure of space vortex and analyze its mechanism.