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The aerodynamic optimisation of a low-Reynolds paper plane with adjoint method

Published online by Cambridge University Press:  24 August 2020

Y. Zhang*
Affiliation:
State Key Laboratory of Mechanical Structure Strength and Vibration, Xi’an Jiaotong University, Xi’an, China
X. Zhang
Affiliation:
State Key Laboratory of Mechanical Structure Strength and Vibration, Xi’an Jiaotong University, Xi’an, China
G. Chen
Affiliation:
State Key Laboratory of Mechanical Structure Strength and Vibration, Xi’an Jiaotong University, Xi’an, China

Abstract

The aerodynamic performance of a deployable and low-cost unmanned aerial vehicle (UAV) is investigated and improved in present work. The parameters of configuration, such as airfoil and winglet, are determined via an optimising process based on a discrete adjoint method. The optimised target is locked on an increasing lift-to-drag ratio with a limited variation of pitching moments. The separation that will lead to a stall is delayed after optimisation. Up to 128 design variables are used by the optimised solver to give enough flexibility of the geometrical transformation. As much as 20% enhancement of lift-to-drag ratio is gained at the cruise angle-of-attack, that is, a significant improvement in the lift-to-drag ratio adhering to the preferred configuration is obtained with increasing lift and decreasing drag coefficients, essentially entailing an improved aerodynamic performance.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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