合成射流吹/吸程环量控制数值模拟研究

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

通过数值模拟手段在NACA0015翼型上对合成射流环量控制过程进行了研究,并通过流场结果分析了吸程和吹程的控制机制.基于翼型弦长(c)和来流速度(U_(∞))的雷诺数(Re)为250000.合成射流出口分别布置在翼型的上后缘和下后缘.结果表明,在上后缘和下后缘施加合成射流控制有显著增升效果,其控制效果与动量系数(C_(μ))和无量纲频率(F^(+))有关.合成射流的吹程和吸程都有助于提升升力.当上后缘施加合成射流控制时,增升效果随无量纲频率增加略有减弱.相反地,下后缘合成射流控制效果随无量纲频率增加而增加.无论合成射流环量控制布置在上后缘或下后缘,控制效果都随着动量系数的增加而增加.

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.