Abstract
A method for calculating transonic wind-tunnel wall interference in axisymmetric slotted test sections is studied. The problem of designing slot shapes for minimum interference is also addressed. The considered slot flow model is inviscid. On finding the wall interference, a filtered small disturbance velocity potential is iteratively solved between the wall and the body, repeatedly using a homogeneous wall boundary condition. When designing an optimal slot for a given body the desired free airflow at the wall is the main input. Thus, there is no need for repeated field calculations within the test section to create a slot. A number of cases for nonoptimal and optimal slots are shown at design and off-design conditions for three axisymmetric bodies.
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