Use of calculus of variations to determine the shape of hovering rotors of minimum power and its application to micro air vehicles


Autoria(s): López García, Oscar; Cuerva Tejero, Alvaro; Esteban, S.
Data(s)

01/05/2012

Resumo

In this paper, calculus of variations and combined blade element and momentum theory (BEMT) are used to demonstrate that, in hover, when neither root nor tip losses are considered; the rotor, which minimizes the total power (MPR), generates an induced velocity that varies linearly along the blade span. The angle of attack of every blade element is constant and equal to its optimum value. The traditional ideal twist (ITR) and optimum (OR) rotors are revisited in the context of this variational framework. Two more optimum rotors are obtained considering root and tip losses, the ORL, and the MPRL. A comparison between these five rotors is presented and discussed. The MPR and MPRL present a remarkable saving of power for low values of both thrust coefficient and maximum aerodynamic efficiency. The result obtained can be exploited to improve the aerodynamic behaviour of rotary wing micro air vehicles (MAV). A comparison with experimental results obtained from the literature is presented.

Formato

application/pdf

Identificador

http://oa.upm.es/16424/

Idioma(s)

eng

Publicador

E.T.S.I. Aeronáuticos (UPM)

Relação

http://oa.upm.es/16424/1/INVE_MEM_2012_133641.pdf

http://pig.sagepub.com/content/226/5/574

info:eu-repo/semantics/altIdentifier/doi/10.1177/0954410011411636

Direitos

http://creativecommons.org/licenses/by-nc-nd/3.0/es/

info:eu-repo/semantics/openAccess

Fonte

Proceedings of the Institution of Mechanical Engineers Part G-Journal of Aerospace Engineering, ISSN 0954-4100, 2012-05, Vol. 226, No. 5

Palavras-Chave #Aeronáutica
Tipo

info:eu-repo/semantics/article

Artículo

PeerReviewed