跨声速风洞翼型动态失速实验系统研制

为满足旋翼设计的需要,研制了增压连续式跨声速风洞二元试验段翼型动态失速实验系统。开发了相应的测控系统,设计并安装了机械驱动机构,建立了数据采集及其后处理系统。动态试验测控系统的测量部分与控制部分相互独立,且与风洞主控系统、安全联锁系统等互不影响,可单独工作,安全性高,抗干扰性能好。机械系统设计合理,运动轨迹精确,该机构以平均迎角0°振幅10°,振荡频率2Hz运行时,最大迎角误差为±0.809°,平均迎角误差为0.255°,振幅均方根误差为0.325°,满足翼型动态失速实验的要求。数据采集采用多路并行A/D,其同步性能好,避免相差。在风洞实验系统联调中使用了NACA0012翼型模型,通过在翼型表面安装动态压力传感器,测量Ma=0.3,平均迎角为10°, 振幅为5°,减缩频率分别为0.05,0.03和0.01下,翼型表面脉动压力。其结果表明,实验系统在大动压,不同频率下,运行稳定,数据合理可靠,实现了设计要求。

The Development of Airfoil Dynamic Stall Experiment System in a Transonic Wind Tunnel

In order to meet the design requirement of rotor blade airfoil, an airfoil dynamic stall experiment system is developed at a pressurized continuous transonic wind tunnel. The corresponding measurement and control system is established, the mechanical driving mechanism is designed and fabricated, and the data acquisition and post-processing system are built. The measuring system and control system of the dynamic system are separate and independent to each other. Both of them do not interfere with the main control system and the safety interlock system of the wind tunnel. Thus the measurement and control system of the dynamic system can work alone and has high security, reliability and robustness. The driving mechanism is designed reasonably, and has accurate motion locus. When it is operating with a main angle of attack of 0°, an amplitude of 10° and an oscillation frequency of 2Hz, it has a margin error of ±0.809°, and average error of 0.255°, and an error of amplitude of 0.325°. The ground test results show that the driving mechanism meet the requirement of the dynamic stall experiment. The data acquisition system utilizes multi-channel parallel A/D, which has decent quality of synchronism and can avoid phase shift. A NACA0012 airfoil with dynamic pressure transducers is used in the wind tunnel system joint debugging. The freestream velocity is Ma=0.3, average AOA is 10°, amplitude is 5°, the reduced frequency is 0.05, 0.03 and 0.01 respectively. The results show that, the experiment system is stable, the data acquisition system is reliable at various frequency and high dynamic pressure, meeting the design requirement.