Videogrammetry of the model's attitude in wind tunnel testing

摘要

The advanced precision of drag coefficient is 0.0001 for the high speed wind tunnel test of measuring forces, the model's angle of attack precisionσα is ≤0.01°following errors distribution. A videogrammetric method of model's attitude is therefore proposed, its uncertainty is investigated, and a compensation method of its systematic error is also presented by this paper. The three engineering videogrammetric experiments of attack angle in 2 meter supersonic wind tunnel testing have demonstrated that σ_a of videogrammetric measurement system established by this paper is ≤0.0094°, in addition it neither destroys the model's shape, nor changes the stiffness or strength, so it is useful and effective.