倾转旋翼机连续倾转过渡状态数值模拟  

Numerical Simulation of Continuous Tilting Transition of Tiltrotor Aircraft

作　　者：吴伟伟[1] 马存旺[1] 张练 孙凯军[1] WU Weiwei;MA Cunwang;ZHANG Lian;SUN Kaijun(Caihong UAV Technology Co.,Ltd.,China Academy of Aerospace Aerodynamics,Beijing 100074,China)

机构地区：[1]中国航天空气动力技术研究院彩虹无人机科技有限公司,北京100074

出　　处：《航空工程进展》2021年第3期55-64,共10页Advances in Aeronautical Science and Engineering

摘　　要：倾转旋翼机在倾转过渡过程中气动构型不断变化,气动特性具有强非线性的特点。针对倾转旋翼机复杂的连续倾转过渡状态,基于运动嵌套网格和局部坐标系理论建立一套适合于模拟倾转旋翼机连续倾转过渡状态的网格系统,并采用RANS方程建立适合于强非线性气动特性的非定常流场分析的CFD方法;采用该方法模拟某型倾转旋翼机从直升机模式到固定翼模式的连续倾转过渡状态的气动特性。结果表明:对于不同的倾转过渡时间,旋翼和机体气动特性随旋翼倾转角增加变化趋势基本一致;随着旋翼倾转角增加,机体升力系数先增大后减小,在旋翼倾转角40°附近达到最大,相比初始状态及平飞状态增大约30%;随着旋翼倾转角、总距角及前飞速度线性增大,旋翼拉力系数及其垂向分量逐渐减小;旋翼倾转角和前飞速度线性增大,采用合适的总距角非线性变化曲线,倾转旋翼机总升力可以保持在目标值附近。The aerodynamic configuration of the tiltrotor aircraft is constantly changed during the tilting transition process,and the aerodynamic characteristics is of strongly nonlinear characteristics.Aiming at the complex states of continuous tilting transition for the tiltrotor aircraft,the grid system suitable for the simulation of the continuous tilt⁃ing transition for the tiltrotor aircraft is established through the moving embedded grid and local coordinate system theory,and based on the RANS equation,a CFD method suitable for unsteady flow field analysis with strongly nonlinear aerodynamic characteristics is established.The method is used to simulate the aerodynamic characteristics of the continuous tilt transition for a certain type tiltrotor aircraft from helicopter mode to fixed wing mode.The re⁃sults show that the aerodynamic characteristics of the rotors and the airframe have the same trend with the increase of the rotor tilt angle for different tilt transition time.As the rotor tilt angle increase,the lift coefficient of airframe is firstly increased and then decreased,and achieved the maximum value near 40°,which is increased by about 30%in comparison with the initial state and level flight.As the rotor tilt angle,with the increased of collective pitch an⁃gle and forward flight speed linearly,the rotor tension coefficient and its vertical component gradually are decreased gradually.With the linear increase of the rotor tilt angle and forward flight speed,the total lift of the tiltrotor aircraft can be kept near the target value by using a suitable nonlinear variation curve of the collective pitch angle.

关 键 词：倾转旋翼 连续倾转过渡 气动特性 数值模拟 嵌套网格 

分 类 号：V211.[航空宇航科学与技术—航空宇航推进理论与工程]