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首页> 外文期刊>The Aeronautical Journal >The adverse cyclic and collective pitch effect in a rotor
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The adverse cyclic and collective pitch effect in a rotor

机译：转子中不利的周期性和集体螺距效应

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Numerical simulations have been carried out for a 32.16-ft-diameter rotor in autorotational forward flight. Coupled flapping and rotational equations were solved using the transient simulation method (TSM) to ascertain the quasistatic torque equilibrium conditions. The Pitt/Peters inflow theory was adopted in the simulations, and an airfoil look-up table made by a compressible Navier-Stokes solver was used. The adverse cyclic and collective pitch inputs were introduced in a similar fashion to helicopter control in that the cyclic lever is pulled back and the collective lever is pushed down for increasing airspeeds. The simulation results showed that the longitudinal cyclic pitch input combined with a lowered collective pitch increases the rotating torque for a low shaft angle and an advance ratio greater than one, producing both high lift and a high lift-to-drag ratio. Upon introducing the adverse cyclic and collective pitch inputs, the control range broadened, and a torque equilibrium condition was detected at 414.7kt (700ft/s) of airspeed in the simulation.
机译：在自转正向飞行中，对直径为32.16英尺的旋翼进行了数值模拟。使用瞬态仿真方法（TSM）求解了耦合的拍打和旋转方程，以确定准静态转矩平衡条件。在模拟中采用了Pitt / Peters流入理论，并使用了由可压缩的Navier-Stokes求解器制作的机翼查找表。不利的周期性和集体俯仰输入以与直升机控制类似的方式引入，因为周期性操纵杆被拉回，集体操纵杆被向下推以增加空速。仿真结果表明，纵向循环螺距输入加上较低的总螺距可在较小的轴角和大于1的提前比的情况下增加旋转扭矩，从而产生较高的升力和较高的升阻比。在引入不利的周期性和集体螺距输入后，控制范围扩大，并且在模拟中以414.7kt（700ft / s）的空速检测到扭矩平衡条件。

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