Effects of Rotor-Rotor Interaction on the Wake Structure and Thrust Generation of a Quadrotor Unmanned Aerial Vehicle
| Autor: | Jaesung Jang, Seong Yong Woo, Jooha Kim, Seungcheol Lee, Seokbong Chae |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
General Computer Science
Separation (aeronautics) Thrust 02 engineering and technology Wake 01 natural sciences 010305 fluids & plasmas law.invention symbols.namesake law 0103 physical sciences thrust General Materials Science Physics wake Rotor (electric) Rotor-rotor interaction Momentum transfer General Engineering Reynolds number Mechanics 021001 nanoscience & nanotechnology TK1-9971 Vortex Momentum theory symbols Electrical engineering. Electronics. Nuclear engineering unmanned aerial vehicles 0210 nano-technology |
| Zdroj: | IEEE Access, Vol 9, Pp 85995-86016 (2021) |
| ISSN: | 2169-3536 |
| Popis: | In this paper, the effects of rotor-rotor interaction on the wake structure and thrust generation of a quadrotor unmanned aerial vehicle (UAV) are experimentally investigated in the rotor tip Reynolds number range of 34000 – 54000. The interaction strength is manipulated by varying the number of rotating rotors and the normalized rotor separation distance. A stronger rotor-rotor interaction places the inner tip vortices between rotors closer to each other, forming an upflow region through vortex pairing and intensifying the turbulence intensity between rotors. To comprehensively evaluate the effect of interaction on the wake structure, we propose a modified Landgrebe’s model that accurately describes the wake boundary of UAV, given the number of rotating rotors and the normalized rotor separation distance. The wake analysis based on the model shows that the stronger the rotor-rotor interaction, the less the wake contracts and the closer the vena contracta moves to the rotor-tip path plane. The momentum theory combined with the modified Landgrebe’s model shows that the loss of axial momentum transfer due to the wake inclination is insufficient to account for the thrust loss caused by the rotor-rotor interaction. This paper shows that the shift of the inner tip vortex away from the rotational axis and the corresponding increase of induced axial velocity followed by a decrease in the local effective angle of attack is another important mechanism for the thrust loss. |
| Databáze: | OpenAIRE |
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