80°三角翼流动显示和涡频测量试验研究

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 investigation of a 80-deg sweep delta wing on flow visualization and vortex frequency measurement

The study of the unsteady flow field and aerodynamic characteristics of a 80-deg sweep delta wing was performed by means of static and dynamic experimental investigation in FL-5,a low speed wind tunnel of CARIA.The newly developed parallel multi-laser-sheet device can produce 6 parallel laser sheets and the pressurized-air particle generator can produce continuous,even,and adjustable particle.Vortex motion frequency and model vibration frequency were measured respectively by an optical method and the FFT of the signal of a DMS balance at high angles of attack and high roll angles.The results,7.75 Hz and 7.2 Hz under the same test condition,shows that model vibration may be caused by vortex motion.Flow image phase average processing technique was explored creatively to obtain more accurate results of the vortex position at model's large amplitude motion.Flow visualization image 3-D reconstruction was conducted to visual the global domain of vortex configuration.