Accession Number:

AD0726434

Title:

Analysis of a Circulation Controlled Elliptical Airfoil,

Descriptive Note:

Corporate Author:

WEST VIRGINIA UNIV MORGANTOWN DEPT OF AEROSPACE ENGINEERING

Personal Author(s):

Report Date:

1971-04-01

Pagination or Media Count:

185.0

Abstract:

The effect of trailing edge blowing on the circulation around an airfoil section is considered theoretically. The analysis is self-contained in that specification of the ambient conditions, flight conditions, and blowing conditions gives the sectional lift and drag coefficients on the prescribed airfoil section. The method of solution is an iterative one, and involves the matching of an assumed sectional lift coefficient with the sectional lift coefficient calculated from the actual pressure distribution over the body in the presence of trailing edge blowing. In order to obtain the pressure on the wall in the wall jet region a full boundary layer analysis is required over the airfoil. The Karman-Pohlhausen integral method is used in the laminar region and the Nash and Hicks turbulent layer analysis is used in the turbulent region. Using the boundary layer properties on the upstream side of the wall jet, along with conservation of mass and momentum relations through the mixing zone, a new wall jet profile is found at the downstream end of the potential core. The wall jet region is then analyzed using integral methods including entrainment. The analysis represents an extension to the calculation method proposed by Kind, and reconfirms the feasibility of obtaining high lift coefficients with relatively low blowing rates. Author

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE