Abstract
Relaxation methods were applied to the determination of the effects of compressibility on two-dimensional wind-tunnel interference. Calculations were made for a 10-per cent-thick symmetrical section, both isolated and symmetrically placed between two walls, for ratios of chord to tunnel height c/h of 1 and 2. Flows at Mach Numbers of both 0 (incompressible flow) and 0.5 were obtained. The incompressible velocities agreed well with those obtained by conformal mapping methods and the compressible velocities for the free-stream case were in satisfactory agreement with those given by Kaplan. Evaluation of the wall interference showed tha t the effect of compressibility averaged linearly along the chord was about the same as given by the linear-perturbation theories of Goldstein and Young, and Allen and Vincenti. The variations along the chord were so great, however, tha t the use of these theories for correcting local quantities is problematical.
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