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合成双射流激励器是合成射流技术发展的最新成果,所形成的射流具有更高能量、流动更稳定的特点。采用数值模拟的方法,对比研究了合成射流与合成双射流对翼型分离流动的改善效果。结果表明:合成射流可以将翼型失速攻角提高2°、最大升力系数增加18%,合成双射流可以将翼型失速攻角提高4°、最大升力系数增加35%,证明了合成双射流具有更好的分离流动控制效果。另外着重分析了合成双射流工作频率和动量系数对控制效果的影响,发现当激励器工作频率为流场特征频率的1和2倍时,对翼型气动特性的改善效果最好,同时控制效果会随动量系数的增加而增大。
The synthetic dual jet actuator is the latest achievement in the development of synthetic jet technology. The jet formed has the characteristics of higher energy and more stable flow. By numerical simulation, the effect of synthetic jet and synthetic twin jet on the separation of airfoil is compared. The results show that the synthetic jet can increase the angle of attack of the airfoil by 2 ° and the maximum lift coefficient by 18%. The synthetic jet can increase the angle of attack of the airfoil by 4 ° and increase the maximum lift coefficient by 35% Better separation of flow control effects. In addition, the effects of working frequency and momentum coefficient on the control effect are analyzed emphatically. It is found that when the operating frequency of the actuator is 1 and 2 times of the characteristic frequency of the flow field, the aerodynamic characteristics of the airfoil are better and the control effect Will increase with the increase of momentum coefficient.