The influence of free-stream disturbances on low Reynolds number airfoil experiments
The influence of free-stream disturbances on low Reynolds number airfoil experiments
复制标题
自由流扰动对低雷诺数翼型实验的影响
DOI：
10.1007/bf00282261
复制
发表时间：
1983
影响因子：
2.4
通讯作者：
B. Jansen
中科院分区：
文献类型：
--
作者：
T. Mueller;L. J. Pohlen;P. Conigliaro;B. Jansen
给出了自由流扰动对李萨曼7769翼型升阻性能影响的研究结果。利用热线风速计和声压级测量来描述风洞扰动环境。通过在测试区段上游增加‘湍流屏’和/或在测试区段下游增加限流器来增加干扰水平。对于利萨曼翼型，发现在低弦雷诺数(即低于200,000)下获得准确的风洞数据所涉及的问题由于边界层对自由流扰动环境的极端敏感性而变得更加复杂。自由流扰动的影响随扰动量、频率和扰动源的不同而变化。
The results of an investigation of the influence of free stream disturbances on the lift and drag performance of the Lissaman 7769 airfoil are presented. The wind tunnel disturbance environment is described using hot-wire anemometer and sound pressure level measurements. The disturbance level is increased by the addition of a ‘turbulence screen’ upstream of the test section and/or the addition of a flow restrictor downstream of the test section. For the Lissaman airfoil it was found that the problems associated with obtaining accurate wind tunnel data at low chord Reynolds numbers (i.e., below 200,000) are compounded by the extreme sensitivity of the boundary layers to the free stream disturbance environment. The effect of free stream disturbances varies with magnitude, frequency content, and source of the disturbance.