The aerodynamic characteristics of rectangular, low-aspect-ratio wings are experimentally investigated at Reynolds numbers ranging from 1.0 × 10~4 to 1.5 × 10~5. The effects of the thickness ratio, the Reynolds number, and the turbulence intensity on the hysteresis loop are analyzed to reveal the occurrence conditions of static stall hysteresis. The hysteresis at stall is pronounced as the thickness ratio decreases at low Reynolds numbers. The hysteresis disappears when the wing has a relatively large thickness. The Reynolds number also affects the stall angle and the span of the hysteresis region. The hysteresis loop enlarges with a decrease in the turbulence intensity, whereas the aerodynamic performance is nearly unchanged.
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