Quantitative force measurements of pneumatic control on a wing/strake model.
Willson, James Griffin
Howard, Richard M.
Schmidt, Louis V.
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A low-speed wind-tunnel study to quantitatively measure the lift and drag effects of pneumatically controlling a leading edge vortex generated by a half-span, genericfighter- wing model was conducted. The study measured the added lift and drag upon the model, throughout a range of angles of attack, utilizing blowing tubes of different geometry and orientations. The effects of blowing upon the high pressure side of the strake were also investigated. Results showed that the effects of blowing were limited to changes in lift with no apparent changes in drag. Blowing appeared to reattach the flow during the initial stages of wing stall. Blowing increased lift by a maximum of 3.75% at angles of attack greater than 25°. The effects of blowing appeared oscillatory with respect to angle of attack. Blowing rates were varied from C„=0.0 to 0.0035 in an attempt to determine an optimum. It was found that changes in blowing rates had little effect upon ACL .
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