Accession Number:

AD0648872

Title:

INVESTIGATION OF CIRCULATION CONTROL AIRFOILS BY MEANS OF JETS

Descriptive Note:

Final rept., 1 Jul 1964-30 Jun 1966

Corporate Author:

TEXAS UNIV AT AUSTIN DEPT OF AEROSPACE ENGINEERING AND ENGINEERING MECHANICS

Report Date:

1966-11-01

Pagination or Media Count:

105.0

Abstract:

Based on the potential flow theory calculation, the capacity of the air supply, the limitation of the internal pressure of the model and the limitation due to the compressibility effect of the jet stream at high velocities, the elliptical airfoils of 18- and 12-percent-thickness ratios were designed and constructed. Experimental investigations for both models with trailing edge jets include force lift and drag and pitching moment measurements. In addition, static pressure measurements were made in both spanwise and chordwise directions. These results were used to compare with available theories. Circulation control with dual jets for the elliptical airfoil of 18-percent-thickness ratio was tested with very satisfactory results. Tests were also made to determine the practicality of circulation control using a jet issuing from the leading edge region of the airfoil. The determination of the aerodynamic response of the airfoil model to cyclic changes in jet mass flow was also made. The cyclic results were very satisfactory and are presented in the form of pulsating lift coefficient, drag coefficient, and pressure coefficient as a function of pulsating jet coefficient.

Subject Categories:

  • Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE