Investigation of Bioinspired Flow for a Nano Coaxial Rotor in Hover
Publication: Journal of Aerospace Engineering
Volume 34, Issue 3
Abstract
A computational study of a nano coaxial rotor with bioinspired blade motion was conducted at an ultralow Reynolds number to determine the principle of improving rotor performance via an induced unsteady mechanism. A flow solver was established based on the preconditioned compressible Navier–Stokes equations, a lower-upper Symmetric-Gauss-Seidel with pseudo time sub-iteration (LUSGS-τts) dual-time marching method, and an overset grid technique. The effect of different pitching rotors on the nano coaxial rotor performance was investigated. A pitching upper rotor slightly impacted the nonpitching lower rotor, whereas it significantly affected the pitching lower rotor. Four blade pitching frequencies were applied successively to the upper rotor to investigate the effect of pitching frequency on rotor performance. The results indicated that the greatest improvement in figure of merit occurred at a blade pitching frequency of 4/revolution. The figure of merit values for the upper rotor and lower rotor were 7.2% and 6.7%, respectively. The generation and evolution of the leading-edge vortex and trailing-edge vortex led to reattachment of flow in cases in which the rotor performance was improved.
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Data Availability Statement
All data and models used in the study are in the published article.
Acknowledgments
The authors are grateful to the National Natural Science Foundation of China (Grants Nos. 11772252 and 11302164) and Project B18040 for its support.
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Published In
Journal of Aerospace Engineering
Volume 34 • Issue 3 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 26, 2020
Accepted: Oct 9, 2020
Published online: Jan 23, 2021
Published in print: May 1, 2021
Discussion open until: Jun 23, 2021
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