Numerical simulation investigation on the suction stroke and blowing stroke of synthetic jet circulation control

This paper numerically simulates synthetic jet (SJ) for circulation control on a NACA0015 airfoil, and analyzes the control mechanism of suction stroke and blowing stroke through the calculated flow field results. The Reynolds number ( Re ) based on the airfoil chord length ( c ) and the oncoming flow velocity ( U ∞ ) was 250000. The SJ slots are respectively arranged at the upper trailing edge (TE) and the lower TE of the airfoil. The results show that applying the SJ control at the upper TE and the lower TE has a significant effect on lift enhancement, whose control effect is related to momentum coefficient ( C μ ) and reduced frequency ( F + ). Both the suction stroke and blowing stroke of SJ contribute to lift enhancement. When the upper trailing-edge jet is applied, the control effect on lift enhancement is slightly weakened with the increase of the reduced frequency. Conversely, the control effect of the lower trailing-edge jet increases as the reduced frequency increases. Whether the SJ is arranged on the upper TE or the lower TE, the control effect increases as the momentum coefficient increases.