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Numerical and Experimental Estimation of the Efficiency of a Quadcopter Rotor Operating at Hover
Universidad de los Andes, Colombia.
Universidad de los Andes, Colombia.
Universidad de los Andes, Colombia.ORCID iD: 0000-0001-6795-9396
Universidad de los Andes, Colombia.ORCID iD: 0000-0002-4099-253X
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2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 2, article id 261Article in journal (Refereed) Published
Abstract [en]

Globalization has led to an increase in the use of small copters for different activities such as geo-referencing, agricultural fields monitoring, survillance, among others. This is the main reason why there is a strong interest in the performance of small-scale propellers used in unmanned aerial vehicles. The flow developed by rotors is complex and the estimation of its aerodynamic performance is not a trivial process. In addition, viscous effects, when the rotor operates at low Reynolds, affect its performance. In the present paper, two different computational methods, Computational Fluid Dynamics (CFD) and the Unsteady Vortex Lattice Method (UVLM) with a viscous correction, were used to study the performance of an isolated rotor of a quadcopter flying at hover. The Multi Reference Frame model and transition SST κ−ω turbulence model were used in the CFD simulations. The tip vortex core growth was used to account for the viscous effects in the UVLM. The wake structure, pressure coefficient, thrust and torque predictions from both methods are compared. Thrust and torque results from simulations were validated by means of experimental results of a characterization of a single rotor. Finally, figure of merit of the rotor is evaluated showing that UVLM overestimates the efficiency of the rotor; meanwhile, CFD predictions are close to experimental values.

Place, publisher, year, edition, pages
2019. Vol. 12, no 2, article id 261
Keywords [en]
figure of merit; CFD; UVLM; vortex core growth; viscous effects; isolated rotor; hover
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-73655DOI: 10.3390/en12020261OAI: oai:DiVA.org:ltu-73655DiVA, id: diva2:1305057
Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-04-16Bibliographically approved

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Publisher's full texthttps://www.mdpi.com/1996-1073/12/2/261

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López, Omar D.Suarez, LauraEscobar, Jaime A.
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