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Numerical Investigation on the Influence of Geometrical Parameters on the Aerodynamic Performance of a Small-Scale Ducted Fans System
Arabian Journal for Science and Engineering ( IF 1.711 ) Pub Date : 2021-06-10 , DOI: 10.1007/s13369-021-05799-x
Chengxiang Zhu, Zhancang Hu, Zejun Cai, Junning Sun, Tianyang Wang, Zhenqi Sun, Yancheng You

Small-scale ducted fans can be used to generate the necessary force and moment for propulsion in many applications. In the present work, the aerodynamic performance of a ducted fans system (DFS), which consists two distinct counter-rotating ducted fans, is analyzed numerically by considering the influence of different geometrical parameters that include rotational speed, eccentricity, and the distance between the two fans. The results reveal that the force and moment in the axial direction are orders of magnitude higher than those in the other two directions under typical conditions. The aerodynamic performance of the DFS shows only minor vibrations for dimensionless rotational speed N below 1 which corresponds to the critical physical rotational speed of 2.104 rpm. Moreover, the force and moment increase dramatically for higher N, following the typical relationship between rotational speed and force for rotor systems. The eccentricity contributes to significant increase in magnitudes on both force and moment in all three directions, whereas the distance between the twin fans exhibits little impact. The numerical simulations suggest that the exploitation of eccentricity is the most efficient approach to control the total output of force and moment of the DFS within the investigated range of geometrical parameters.



中文翻译:

几何参数对小型涵道风扇系统气动性能影响的数值研究

在许多应用中,小型管道风扇可用于产生推进所需的力和力矩。在目前的工作中,通过考虑不同几何参数的影响,包括转速、偏心距和风扇之间的距离,对由两个不同的反向旋转管道风扇组成的管道风扇系统 (DFS) 的空气动力学性能进行了数值分析。两个粉丝。结果表明,在典型条件下,轴向的力和力矩比其他两个方向的力和力矩高几个数量级。DFS 的空气动力学性能显示,对于低于 1 的无量纲旋转速度N,这对应于临界物理旋转速度 2.10 4 转速。此外,按照转子系统的转速和力之间的典型关系,对于较高的N,力和力矩显着增加。离心率导致所有三个方向上的力和力矩的大小都显着增加,而双风扇之间的距离几乎没有影响。数值模拟表明,利用偏心距是在几何参数研究范围内控制 DFS 的力和力矩总输出的最有效方法。

更新日期:2021-06-10
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