A Correlation Study of Wind Tunnel Wall Correction in Low Speed Wind Tunnel

In closed section wind tunnel, the flow field around the test model changes due to the test-section being surrounded by the wind tunnel wall. Therefore, the correction of aerodynamic characteristics changes due to the wall affects the accuracy of the test results. It is generally known that a correction to the wall effect is required if the blockage ratio is greater than 5%. There are classical methods, wall pressure measurement method, CFD application method, and adaptive wall method, but the classical method and the wall pressure measurement method are generally used for the correction of the wall effect. If the size of the measurement part is large like the middle size wind tunnel, the blockage ratio is less than 5% and the correction is not necessarily required. However, if the size of the measurement part is small like the small size wind tunnel, blockage ratio often exceeds 5%. In this study, the same test was conducted on the small size wind tunnel and the middle size wind tunnel in the Air Force Academy, and various comparisons were made and compared with the corrected experimental results. We tried to find the applicable correction method for the small size wind tunnel by correcting the results in the small size wind tunnel with the middle size wind tunnel results.