Multirotor Drone Aerodynamic Interaction Investigation
Open Access
- 2 December 2018
- Vol. 2 (4), 43
- https://doi.org/10.3390/drones2040043
Abstract
Aerodynamic interactions between rotors are important factors affecting the performance of in-plane multirotor Unmanned Air Vehicles (UAVs) or drones, which are the majority of small size UAVs (or mini-drones). Optimal design requires knowledge of the flow features. The low Reynolds number of many UAV rotors raises the question of how these features differ from those expected by traditional analytical methods for rotorcraft. Aerodynamics of a set of side-by-side rotors in hover over a range of rotor separation and Reynolds number is studied using high-speed Stereo Particle Image Velocimetry (SPIV) and performance measurements. The instantaneous and time-averaged SPIV data presented here indicate an increase in inter-rotor wake interactions with decrease in rotor spacing and Reynolds number. A dip in rotor efficiency at small rotor spacing at low Reynolds number is observed through thrust and torque measurements. The basic components of in-plane multirotor wake and velocity profiles are identified and discussed to help generalize the findings to a wide range of drones. However, the data provide confidence in traditional analysis tools, with small modifications.Keywords
Funding Information
- Vertical Lift Research Center of Excellence (W911W6-17-2-0002)
This publication has 17 references indexed in Scilit:
- Aerodynamic Interactions Study on Low-Re Coaxial and Quad-Rotor ConfigurationsPublished by ASME International ,2017
- Unmanned Aerial Systems for Civil Applications: A ReviewDrones, 2017
- Classifications, applications, and design challenges of drones: A reviewProgress in Aerospace Sciences, 2017
- Collaborative framework for PIV uncertainty quantification: comparative assessment of methodsMeasurement Science and Technology, 2015
- Science, technology and the future of small autonomous dronesNature, 2015
- Low-Re μUAV Rotor DesignPublished by Springer Nature ,2012
- Computational Investigation of Micro Hovering Rotor AerodynamicsJournal of the American Helicopter Society, 2010
- Aerodynamic Characteristic Analysis of Multi-Rotors Using a Modified Free-Wake MethodTRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2009
- Flowfield of a Rotating-Wing Micro Air VehicleJournal of Aircraft, 2007
- Hover Performance of a Micro Air Vehicle: Rotors at Low Reynolds NumberJournal of the American Helicopter Society, 2007