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Aerodynamic Characteristics of a Micro Multi-Rotor Aircraft with 12 Rotors Considering the Horizontal Wind Disturbance

机译：考虑水平风扰动的带12转子的微型多转子飞机的空气动力学特性

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Wind disturbance posed difficulties for the stability of the micro air vehicles (MAVs) with attitude variation. In this paper, the aerodynamic performance of a MAV with six coaxial rotor pairs considering the horizontal wind is investigated by both experiments and numerical simulations. First, the effect of the horizontal wind on the multi-rotor aircraft is analyzed in detail. Then, low-speed wind tunnel tests were performed to obtain the thrust and power consumption and the aerodynamic performance of the multi-rotor aircraft ( l / D = 1.2 and h / D = 0.19) with the rotational speed of 1500–2300 r/min in the horizontal wind ranged from 0 to 5 m/s. Finally, the distribution of streamline, the pressure of the blade tip, and the velocity and the vortices in the flow field of a multi-rotor aircraft with horizontal wind disturbance, were simulated and studied using the computational fluid dynamics (CFD) method. Through the comparison of experimental results and simulation results, it can be seen that the horizontal wind disturbance will increase power consumption to weaken the aerodynamic performance at higher rotor speeds. However, larger thrust and better hover performance are obtained at lower rotational speeds with good wind resistance. Additionally, due to the mutual induction between rotor wakes, the interactions of downwash flows become more intense at higher rotational speeds or larger wind speeds where the vortexes at the blade tip deformed and moved along with the wind.
机译：风扰动为微型空气车辆（MAVS）的稳定性带来了姿态变化的困难。本文通过实验和数值模拟研究了考虑水平风的六个同轴转子对的MAV的空气动力学性能。首先，详细分析水平风对多转子飞机上的影响。然后，进行低速风洞测试以获得推力和功耗，以及多转子飞机（L / D = 1.2和H / D = 0.19）的气动性能，其转速为1500-2300 r /水平风中的分钟范围为0至5米/秒。最后，利用计算流体动力学（CFD）方法模拟和研究了流线，叶片尖端的分布，叶片尖端的压力和速度和旋转的流场中的流场中的速度和涡流。通过对实验结果和仿真结果的比较，可以看出水平风扰动将增加功耗，以削弱更高转子速度的空气动力学性能。然而，在较低的旋转速度下获得较大的推力和更好的悬停性能，具有良好的防风速度。另外，由于转子之间的互感唤醒，吹水流的相互作用在较高的转速或更大的风速下变得更加强烈，其中叶片尖端处的涡流变形并与风一起移动。

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