Practical Solutions to Simulation Difficulties in Subscale Wind Tunnel Tests,
LOCKHEED MISSILES AND SPACE CO INC SUNNYVALE CA
Pagination or Media Count:
Reynolds number scaling and support interference are the two main problems encountered in wind tunnel tests with subscale models. In the past, when the designer was striving to maintain attached flow over the vehicle, neither problem was very difficult to solve. The use of boundary layer trips often could solve the scaling problem and only the clumsiest of model support design would cause any interference beyond the easily corrected base drag effect. However, when the aerodynamics are dominated by separated flow effects, which often is the case for present day high performance aircraft and missiles, both problems become formidable. The paper describes practical means through which the test engineer can resolve his difficulties.