Active and passive pitch-controlled flapping wing propulsors; usage of the wake structure as a performance qualifier
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/332359
Tipus de documentText en actes de congrés
Data publicació2015
EditorCIMNE
Condicions d'accésAccés obert
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
Abstract
Economic and ecological needs dictate for an ever growing need for increased
efficiency, both in marine propulsion and energy saving systems. Biomimetic (flapping wing)
systems, have already shown a serious potential as propulsors [1] and an even greater as a
mechanism that converts energy from ship motions to thrust [2], [3]. In this paper,
the problem of passively (spring loaded) or actively pitched controlled wing is formulated
and solved using a free wake 3D Boundary Element Method [4]. For the spring loaded case, the
unsteady BEM code is used to calculate the instantaneous forcing (i.e. pitching moment)
entered in the nonlinear second order PDE in time, expressing equilibrium of moments
including damping and inertia, around the pitch axis. Systematic simulations were conducted for a
series of harmonically heaving wings of different aspect ratios, with the instantaneous pitch
selected either passively via a spring-damper system or actively using a proper control algorithm.
The results regarding developed mean thrust coefficient are presented in the form of systematic
diagrams compatible with the design diagrams introduced in [1], allowing comparison of the
different flapping wing propulsors. Results are also presented for the wake patterns of the
different configurations, at similar propulsive conditions, revealing the
connection between the propulsive effectiveness and 3D wake structure.
CitacióTsarsitalidis, V.T.; Politis, G.K.; Belibassakis, K.A. Active and passive pitch-controlled flapping wing propulsors; usage of the wake structure as a performance qualifier. A: MARINE VI. "MARINE VI : proceedings of the VI International Conference on Computational Methods in Marine Engineering". CIMNE, 2015, p. 546-557. ISBN 978-84-943928-6-3.
ISBN978-84-943928-6-3
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
Marine-2015-44_ ... SSIVE PITCH-CONTROLLED.pdf | 973,7Kb | Visualitza/Obre |