Computational Investigation of Small Scale Coaxial Rotor Aerodynamics in Hover

2009 ◽  
Author(s):  
Vinod Lakshminarayan ◽  
James Baeder
Keyword(s):  
Small Scale ◽  
Computational Investigation ◽  
Rotor Aerodynamics ◽  
Coaxial Rotor

scholarly journals Computational Investigation of Microscale Coaxial-Rotor Aerodynamics in Hover

2010 ◽  
Vol 47 (3) ◽  
pp. 940-955 ◽  
Author(s):  
Vinod K. Lakshminarayan ◽  
James D. Baeder
Keyword(s):  
Computational Investigation ◽  
Rotor Aerodynamics ◽  
Coaxial Rotor

Computational Investigation of Micro Hovering Rotor Aerodynamics

2010 ◽  
Vol 55 (2) ◽  
pp. 22001-2200125 ◽  
Author(s):  
Vinod K. Lakshminarayan ◽  
James D. Baeder
Keyword(s):  
Computational Investigation ◽  
Rotor Aerodynamics

Aerodynamic Interactions Study on Low-Re Coaxial and Quad-Rotor Configurations

2017 ◽  
Author(s):  
Dhwanil Shukla ◽  
Nandeesh Hiremath ◽  
Sahaj Patel ◽  
Narayanan Komerath
Keyword(s):  
High Speed ◽  
Particle Image ◽  
Small Scale ◽  
Rotational Flow ◽  
Coaxial Rotor ◽  
Aerodynamic Interaction ◽  
Image Velocimetry ◽  
Stereo Particle Image Velocimetry ◽  
Wake Model ◽  
Free Wake

Unmanned multi-rotor VTOL vehicles have recently gained importance in various applications such as videography, surveillance, search and rescue etc. suited to their small size and relatively cheap construction. Small scale UAVs struggle in providing satisfactory performance in terms of payload, range, and endurance because of higher viscosity-dominated losses, and due to yet to be understood rotor-rotor and rotor-airframe aerodynamic interactions. Viscosity dominated rotational flow field makes most potential flow methods, such as free wake model, invalid. A full N-S based approach for this problem is too expensive. Thus, a multi-rotor aerodynamic interaction study is necessary for understanding crucial phenomena, which will help in developing physics-based models which will be instrumental in multi-rotor UAV performance prediction and design optimization. In present work, a flow visualization and a high-speed stereo Particle Image Velocimetry (SPIV) study is done on two low Reynolds number multi-rotor arrangements with the aim of capturing vortex-vortex, blade-vortex and vortex-duct interactions. The first arrangement is a coaxial rotor in forward flight and another is an in-plane quad-rotor with and without duct. Instantaneous and average PIV data is being presented here with some observations and corresponding interpretations.

Experimental assessment of the noise characteristics of propellers for commercial drones

2021 ◽  
Vol 263 (2) ◽  
pp. 4418-4425
Author(s):  
Han Wu ◽  
Peng Zhou ◽  
Siyang Zhong ◽  
Xin Zhang ◽  
Kunyu Luo
Keyword(s):  
Low Cost ◽  
Industrial Applications ◽  
Broadband Noise ◽  
Small Scale ◽  
Noise Emission ◽  
Rotor Aerodynamics ◽  
Noise Characteristics ◽  
Wide Range ◽  
Test Platform ◽  
The Status

Multi-copters or drones are engaged in a wide range of industrial applications for their flexibility, safety and low-cost. The noise emission is becoming an issue with the expanding applications, among which the propellers that drive the drones are the major sources of noise. In this work, the noise characteristics of small-scale propellers is experimentally investigated using the advanced rotor aerodynamics and aeroacoustics test platform in an anechoic chamber at the Hong Kong University of Science and Technology (HKUST). The study will focus on the representative off-the-shelf propellers. The rotor noise will be measured by a linear array with 20 microphones, and the aerodynamic forces will be acquired by using the high-accuracy load cells. The dependence of both the tonal and broadband noise radiation with the thrust and rotation speed at various conditions will be tested. The study will enhance our understanding of the noise features of the multi-rotor powered drones, and will provide us with a better understanding of the status of the drone noise impact on the environment.

Drone Scale Coaxial Rotor Aerodynamic Interactions Investigation

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Dhwanil Shukla ◽  
Narayan Komerath
Keyword(s):  
High Speed ◽  
Vortex Sheet ◽  
Reynolds Numbers ◽  
Thrust Coefficient ◽  
Low Reynolds Numbers ◽  
Rotor Aerodynamics ◽  
Induced Drag ◽  
Coaxial Rotor ◽  
Simplifying Assumptions ◽  
Uninhabited Aerial Vehicles

Coaxial rotor uninhabited aerial vehicles (UAVs) are compact compared to single rotor UAVs of comparable capacity. At the low Reynolds numbers (Re) where they operate, the simplifying assumptions from high Re rotor aerodynamics are not valid. The low Re coaxial rotor flowfield is studied including aerodynamic interactions and their effect on performance. The evolution of the wake is captured using high-speed stereo particle image velocimetry (SPIV). Improvement of upper rotor performance due to viscous swirl recovery from the lower rotor is discovered and then verified by analyzing PIV data. Interesting vortex–vortex sheet interactions are observed under the coaxial rotor affecting wake structure spatially and temporally. A qualitative model explaining the observed wake interaction phenomena is presented. Comparison with the performance of high Re rotors shows higher profile and induced drag at low Re for the same thrust coefficient.

Computational Investigation of Micro Hovering Rotor Aerodynamics

2006 ◽  
Author(s):  
Vinod Lakshminarayan ◽  
Brandon Bush ◽  
Karthikeyan Duraisamy ◽  
James Baeder
Keyword(s):  
Computational Investigation ◽  
Rotor Aerodynamics
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