双射流环量控制翼型的控制力矩特性研究

为了探究环量控制技术在飞行控制性能方面的优势，在定常流场中对定常射流环量控制翼型的控制力矩作用机理展开了研究，采用数值仿真的方法，对比分析了单射流、双射流产生的虚拟舵面与传统舵面作用下的气动力系数的变化规律，并基于无舵面飞行器CCSCAOON对其气动力矩的控制特性进行了验证。验证结果表明:单射流作用下的虚拟舵面能够提供用于飞行器所需的滚转和俯仰力矩，且作用机理相似，控制性能优于传统舵面；无论是单射流还是双射流，在大迎角下虚拟舵面的气动控制特性较差，限制了环量控制的使用迎角；双射流较单射流而言，升阻比特性和控制力矩特性较好；双射流下的虚拟舵面通过调节下射流口动量系数，能够有效降低偏航力矩与滚转、俯仰力矩之间的耦合效应。 

Control moment characteristics of double-jet circulation control airfoil

In order to study the possibility of flight control by circulation control technology, the control moment characteristics of steady jet circulation control airfoil in steady flow field are studied. The aerodynamic coefficient variation rules of virtual rudder and traditional rudder produced by single jet and double jet are compared and analyzed by numerical simulation, and the aerodynamic moment control characteristics are verified based on the rudderless aircraft Circulation Control SCAOON (CCSCAOON). The verification results show that the virtual rudder under single jet can provide the rolling and pitching torque needed by aircraft, the action mechanism is similar, and the control performance is better than that of the traditional rudder. Whether under single jet or double jet, the aerodynamic characteristics of circulation control airfoils at high angle of attack are poor, which limits the use of circulation control angle of attack. The lift-drag ratio and control torque characteristics of double jet are better than those of single jet. By adjusting the momentum coefficient of the lower jet port, the virtual rudder under double jet can effectively reduce the coupling effect of yaw moment, rolling moment and pitching moment.