The high performance of the coflow jet (CFJ) airfoil, using an injection jet slot near the leading edge (LE) and a suction slot near the trailing edge (TE), with the wind tunnel test results is demonstrated. The baseline airfoil NACA0025 and the CFJ airfoil CFJ0025-065-196 airfoil has the injection slot height of 0.65% of the chord and the suction slot height of 1.96% of the chord. The results show that the lowest injection total pressure coefficient of the CFJ airfoil of 1.04 has the momentum coefficient varying from 0.05 to 0.1, which increases the angle of attack (AOA) stall margin by 100%. The CFJ airfoil requires that the injection mass flow rate be equal to the suction mass flow rate to achieve the zero mass-flux flow control. The results also show that the mixing shear layer loses stability due to the large difference of the Mach number and the high momentum of the injection jet creates a large centrifugal force, which makes the jet detached and the flowfield collapse.
ASJC Scopus subject areas
- Aerospace Engineering