论文部分内容阅读
通过求解雷诺平均Navier-Stokes方程,研究了同时具有扑动和俯仰运动的三维扑翼气动特性.为了模拟扑翼的弹性特性,在扑翼俯仰轴处设计了扭簧.研究了扑翼平面形状、俯仰弹性轴与质心的相对位置、俯仰刚度变化等参数的影响.结果表明:俯仰角相对扑动角有一个大的相位超前量,且刚度系数越大该超前量越大;考虑了俯仰弹性特征后,计算得到的平均阻力系数减小了60%左右,且升力系数幅值和绕翼根力矩系数的幅值明显减小,而这是判断微型飞行器能否平稳飞行的关键参数.所以,在设计扑翼飞行器时应当考虑其扑翼的俯仰弹性特性,适当设计扑翼的俯仰刚度和俯仰轴的位置对扑翼的空气动力性能至关重要.
By solving the Reynolds-averaged Navier-Stokes equations, the aerodynamic characteristics of the three-dimensional flapping wing with both flutter and pitch motion are studied.In order to simulate the flapping wing’s elastic characteristics, the torsion spring is designed at the flapping wing’s axis of elevation. , The relative position of the pitch elastic axis and the center of mass, the variation of pitch stiffness, etc. The results show that: the pitch angle relative flutter angle has a large phase lead, and the greater the stiffness coefficient the greater the lead; Consider the pitch elasticity Characteristics, the calculated average drag coefficient is reduced by about 60%, and the amplitude of the lift coefficient and the winding torque coefficient are significantly reduced, which is the key parameter to determine whether the micro-aircraft can fly smoothly.Therefore, In the design of flapping-wing aircraft should consider the flapping wing pitch elastic characteristics, the appropriate design flapping wing pitch stiffness and pitch axis position on the flapping wing aerodynamic performance is crucial.