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Physics of gust response mitigation in open-loop pitching manoeuvres.
- Source :
- Journal of Fluid Mechanics; 8/10/2022, Vol. 944, pA38-1-A38-29, 29p
- Publication Year :
- 2022
-
Abstract
- This paper experimentally investigates the flow field development and unsteady loading of three force-mitigating pitch manoeuvres during a transverse gust encounter. The manoeuvres are constructed using varying levels of theoretical and simulation fidelity and implemented as open-loop kinematics in a water towing tank. It is found that pitch actuation during a gust encounter results in two important changes in flow topology: (i) early detachment of the leading-edge vortex (LEV) and (ii) formation of an LEV on the pressure side of the wing upon gust exit. Each of the pitch manoeuvres is found to mitigate a significant portion of the circulatory contribution of the lift force while only manoeuvres with accurate modelling of the added-mass force are found to adequately mitigate the total lift force. The penalty of aerodynamic lift mitigation using pitch manoeuvres was a twofold increase in the pitching moment transients experienced by the wing for all cases. By quantifying changes in the vertical gust momentum before and after the encounter, lift-mitigating manoeuvres were found to reduce the disturbance to the gust's flow field, thereby reducing the momentum exchange between the gust and the wing. [ABSTRACT FROM AUTHOR]
- Subjects :
- LIFT (Aerodynamics)
PHYSICS
FLOW separation
KINEMATICS
WING-warping (Aerodynamics)
Subjects
Details
- Language :
- English
- ISSN :
- 00221120
- Volume :
- 944
- Database :
- Complementary Index
- Journal :
- Journal of Fluid Mechanics
- Publication Type :
- Academic Journal
- Accession number :
- 158271163
- Full Text :
- https://doi.org/10.1017/jfm.2022.509