Abstract
To establish the feasibility of detecting incipient stall on aerodynamic lifting surfaces by measuring fluctuating pressures at strategic surface locations, a wind tunnel study was performed on models of a 45° swept and a 70° Delta wing. The experiments served to determine gross flow patterns and associated lift characteristics, and to relate these to surface pressure spectra. Several typical flow patterns were identified as the angle of attack was changed through the flow regimes where the wings experience maximum lift and approach lift loss, and related to observed pressure spectra, indicating the likelihood that such pressure spectra measurements may be useful for the detection of incipient stall. [This study has been sponsored by the Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio.]
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