Abstract
derived from the transonic small disturbance equation. The equation is linear and is solved by satisfying the imposed conditions at the tunnel wall. By checking against the direct nonlinear calculations the method is shown to be accurate and thus can be used for practical calculations of interference corrections. Since it is a perturbation method, the results can be compared directly with those of the subsonic linear theory and consequently provide assessment of the applicability of the latter method in the transonic range. Analysis The airfoil is situated in the middle of the wind tunnel with height 2//. The tunnel walls are perforated for flow ventilation in transonic tests. The restriction induced by the tunnel wall is regarded as a small perturbation to the basic free airflow. The interference potential ; has the order of magnitude of \/Hand is assumed to be one order higher than the free air potential 00. Within the framework of the transonic small disturbance theory,1'5 the governing equations and the boundary conditions for the free air and the interference flows can be derived as follows. Free airflow:
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