Accession Number:

ADA112312

Title:

High-Lift Capability of Low Aspect Ratio Wings Utilizing Circulation Control and Upper Surface Blowing

Descriptive Note:

Interim rept.

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD AVIATION AND SURFACE EFFECTS DEPT

Personal Author(s):

Report Date:

1980-07-01

Pagination or Media Count:

71.0

Abstract:

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 CCWUSB. 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 CCWUSB 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.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE