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Numerical Assessment of a High Disk Loading Annular Lift Fan Aircraft

机译：高圆盘载荷环形举升飞机的数值评估

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摘要

An annular lift fan aircraft configuration with high disk loading, low empty weight, and acceptable hover efficiency is assessed using numerical methods. The fans have short and very thin blades. With the fan disk loading increased from 28.37 to 91 lb/ft(2), the figure of merit is 0.658 but the power loading drops from 9.03 to 4.65 lb/hp. However, when the aircraft is in ground effect within one aircraft radius to the ground plane, the power loading increases almost 50% to 6.77 lb/hp, which is comparable to helicopters and general aviation aircraft. The design features jet thrusters for forward flight propulsion, where the maximum requirement for jet thrust with the aid of a skirt in transition is 0.448 of the aircraft weight. Turbofan engines with a thrust-to-weight ratio of 0.3 and an augmentation ratio of 1.6-2.0 can satisfy this requirement and enable a top speed of Mach 0.62 (759 km/h) based on drag predictions. Shutters are proposed to close off the annular duct during cruise, and results show that they can close smoothly at the end of transition without causing oscillations of lift and drag.
机译：使用数值方法评估具有高圆盘载荷，低空重和可接受的悬停效率的环形升降风扇飞机配置。风扇叶片短而薄。随着风扇磁盘负载从28.37增加到91 lb / ft（2），品质因数为0.658，但功率负载从9.03降至4.65 lb / hp。但是，当飞机在距地面一圈的半径内处于地面作用时，功率负载将增加近50％，达到6.77磅/马力，这与直升机和通用航空飞机相当。该设计采用了喷气推进器，用于向前飞行推进，在过渡裙部的帮助下，喷气推进的最大需求为飞机重量的0.448。推力重量比为0.3，增强比为1.6-2.0的涡扇发动机可以满足此要求，并基于阻力预测使最高速度达到0.62马赫（759 km / h）。提出了在巡航过程中关闭环形管道的百叶窗，结果表明它们可以在过渡结束时平稳关闭，而不会引起升力和阻力的振荡。

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  • 来源
    《Journal of the American Helicopter Society》 |2018年第4期|042005.1-042005.12|共12页
  • 作者

    Jiang Yun; Zhang Bo;

  • 作者单位

    Northwestern Polytech Univ, UAV Res Inst, Xian, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, UAV Res Inst, Xian, Shaanxi, Peoples R China;

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