BOUNDARY INTERFERENCE AT SUBSONIC SPEEDS IN WIND TUNNELS WITH VENTILATED WALLS
Final rept. Oct 1968-Jan 1969
ARO INC ARNOLD AFS TN
Pagination or Media Count:
Equations and charts as obtained by theoretical analyses are presented for the evaluation of corrections which must be applied to test data as obtained from wind tunnels because of the presence of the test section boundaries. Results are presented for two-dimensional, circular, and rectangular tunnels with boundaries of the completely closed, completely open, slotted, or perforated variety. Interference factors accounting for the direct effects of model and wake blockage on the longitudinal velocity and of model lift on the upwash velocity are enumerated. In addition, consideration is given to the variation of the longitudinal and vertical velocity components along the tunnel axis leading to buoyancy and streamline-curvature corrections.
- Test Facilities, Equipment and Methods