倾转四旋翼飞行器垂直飞行状态气动特性

综合采用基于滑移网格技术的计算流体力学(CFD)方法与悬停状态气动干扰试验方法,对倾转四旋翼(QTR)飞行器垂直飞行状态的流场进行模拟与试验,研究飞行器垂直飞行状态气动特性以及部分参数对气动特性的影响.结果表明:倾转四旋翼飞行器在垂直飞行状态,前后旋翼之间干扰不明显,但旋翼与机翼的干扰明显;旋翼旋向对旋翼与机翼的干扰不...

Aerodynamic characteristics of quad tilt rotor aircraft in vertical flight

The computational fluid dynamics (CFD) method based on unstructured grid sliding grid technology and the experiment method of aerodynamic interference were used to simulate the flow field of the quad tilt rotor (QTR) aircraft in helicopter mode. The aerodynamic characteristics of the QTR aircraft in vertical flight and the effect of some parameters on the aerodynamic characteristics were studied. Results showed that the interference between the front and rear rotors of the QTR aircraft was not obvious, but the interference between the rotor and the wing was greater; the interference of the rotor rotation direction on the rotor and the wing was different, the aerodynamic force of the wing accounted for 15% of the rotor thrust in the right rotation, and 9% of the rotor thrust in the left rotation; during the vertical motion of the QTR aircraft, the rotor lift and torque change could cause changes in component force and low/head-up torque in the forward direction; during the vertical descent of the QTR aircraft, the rotor could enter into the vortex ring state. The presence of the wing effectively reduced the destructive effect of the vortex ring state, and the vortex ring reduced the impact of the airflow on the wing tip.