Numerical investigation of the co-flow jet airfoil on aerodynamic performance

The present project performed the numerical analysis to establish the correlation between the aerodynamic performance of a co-flow jet (CFJ) airfoil and the coefficient of jet momentum (C-mu). The coefficient of jet momentum is a non-dimensional parameter that can be defined and characterised similarly to coefficient of lift (C-L) and coefficient of drag (C-D) and it is significantly correlated with the aerodynamic performance of the CFJ airfoil. The CFJ airfoils are designed and analysed with three distinct coefficient of jet momentum of 0.03, 0.04 and 0.05 by altering the injection slot height, injection mass flow rate, injection jet velocity, while retaining the Mach number, Reynolds number and the location of the slots are constant. To carry out the numerical analysis, the Spalart-Allmaras turbulence model was employed to solve RANS equations for 2D incompressible flow. The CFJ airfoils with similar coefficient of jet momentum having the higher injection velocity are increasing the C-L and stall margin to a larger extent, yet the higher mass flow rate reduce drag to some extent.