Overview of Coănda Jet and Vortex Cell Circulation Control

Abstract

Flow control for enhanced aerodynamic performance have been utilized for enhanced lift, reduced drag and delay of stall at higher angle of attack. To this end, techniques such as continuous, synthetic and pulsed jets, compliant surface, vortex-cell, Coănda jet and the like have been developed and applied to alter the behavior of airfoils, wings, and bodies and other aerodynamic components. Two such techniques are here assessed as potentially promising technique in the framework of airfoil surface blowing circulation enhancement, i.e. Coănda-jet circulation enhancement and vortex-cell. Their progress and development in influencing the effectiveness and configuration of airfoil surface blowing for circulation enhancement of aerodynamic surfaces are discussed, using fundamental principles and CFD technique.