Accession Number:

AD0016075

Title:

CIRCULATION CONTROL BY MEANS OF TRAILING EDGE SUCTION AND THE CUSP EFFECT

Descriptive Note:

Corporate Author:

PRINCETON UNIV NJ JAMES FORRESTAL RESEARCH CENTER

Report Date:

1953-06-15

Pagination or Media Count:

51.0

Abstract:

A mathematical method is presented for predicting under limited conditions the performance of systems employing powered or automatically controlled flow singularities to produce a high lift without a corresponding change in attack angle. Wind-tunnel tests or systems utilizing suction at the trailing edge indicated that 1 the lift increases with increasing suction quantities up to a limiting value without an increase in attack angle 2 the limiting value is determined by the suction quantity required to remove the stagnation point from the upper surface to the trailing edge and 3 the lift obtained with an unflapped profile utilizing edge suction is strongly affected by slot width and trailing edge overhang, but not by upper surface slot shape. A means was devised to create and stabilize a vortex at a desired location. An important feature of the flow is the powerful manner in which the vortex affects the downwash pattern to produce a large circulation about a profile.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE