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首页> 美国政府科技报告 >High-Lift Capability of Low Aspect Ratio Wings Utilizing Circulation Control and Upper Surface Blowing
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High-Lift Capability of Low Aspect Ratio Wings Utilizing Circulation Control and Upper Surface Blowing

机译：利用循环控制和上表面吹制的低纵横比翼的高提升能力

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A semispan research model with a 2-ft span wing was used to measure the high lift capabilities of low aspect ratio wings utilizing powered-lift concepts. The concepts evaluated were the Circulation Control Wing (CCW), the Upper Surface Blowing (USB), and unique combination of the two (CCW/USB). Wing tip sails were used as a means of increasing the effective aspect ratio of these wings during high lift. The highest lift was generated with the CCW/USB configuration where the CCW is used as a thrust vectoring device and successfully turns the engine exhaust up to 165 deg. The lift augmentation resulting from the CCW and the turning exhaust flow produced a maximum circulation lift of 5.1 with an aspect ratio 4 wing. It is shown that this nearly approaches the theoretical maximum circulation lift (independent of the thrust contribution to lift) that can be developed for a given aspect ratio wing. The wing tip sails are effective in reducing the induced drag of these powered-lift low aspect ratio wings under high-lift conditions. The induced drag factor is reduced in some instances by 30 to 35 percent. The relatively low drag of this configuration shows that with correct operational procedure the potential for short takeoff and landing is significant. (Author)

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