Abstract
It has been proved that a linearized theory is consistent for three dimensional lifting case at sonic and nearly sonic speeds and is also applicable to a nonlifting case in the field of Mach number nearly one which has boundaries at finite distances. In the present paper, problems of wall interference in a transonic wind tunnel are discussed by the method of linearized theory. Linearized relations are also assumed for the boundary conditions at slotted or porous walls, usually being used in transonic tunnels. It is shown that a slotted wall is better than a porous wall for lifting and nonlifting bodies in transonic range.
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