风洞试验中模型迎角的视频测量及精度研究

摘要

The measurement of attack angle is a base for the precision and accuracy of test data (the attack angles at the stall and minimum resistance points, for example, are the crucial data for aircraft developing and remodeling). Therefore, the method of videogrammetric measurement for attack angle is presented, and its accuracy is investigated. Several engineering tests of attack angle measuring in 2m supersonic wind tunnel have demonstrated that the accuracy of this approach was ≤0. 01°(the swings no more than 0. 01°can be perceived distinctly) , on the other hand the aerodynamic shape, rigidity and intensity of the model cannot be influenced, therefore it is useful and effective.%模型迎角的准确测量是获得高精度风洞试验数据的基础(如失速点与最小阻力点的准确迎角值是飞行器研制与改型的关键数据).为此,提出风洞试验中模型迎角的视频测量方法,分析其测量精度.2m超声速风洞中的多个迎角视频测量实例表明:该方法的迎角测量精度≤0.01°,可清晰分辨幅度为0.01°的迎角振动过程,而且该方法既不破坏模型的外形,又不改变模型的刚度与强度,测量精度不受模型振动影响,具有实用价值.