On the controlled evolution for wingtip vortices of a flapping wing model at bird scale
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DOI: 10.1016/j.ast.2020.106460
Abstract: Abstract The reduction of wingtip vortices is a critical and challenging task for aircraft wing-design. Inspired by the wingtip morphology of soaring birds, Whitcomb created winglets to reduce the drag of commercial airplanes significantly. As… read more here.
Keywords: evolution; wingtip vortices; flapping wing; tip vortices ... See more keywords
The wake structure of a propeller operating upstream of a hydrofoil
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DOI: 10.1017/jfm.2020.680
Abstract: Abstract Large eddy simulations are presented on the wake flow of a notional propeller (the INSEAN E1658), upstream of a NACA0020 hydrofoil of infinite spanwise extent, mimicking propeller–rudder interaction. Results show that the flow physics… read more here.
Keywords: suction; tip vortices; propeller; wake ... See more keywords
Instability of the tip vortices shed by an axial-flow turbine in uniform flow
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DOI: 10.1017/jfm.2021.433
Abstract: Large-eddy simulation is utilized to reproduce the instability of the tip vortices shed from the blades of an axial-flow turbine. The oscillations of their helical trajectories trigger mutual interaction between them. This accelerates the process… read more here.
Keywords: tip vortices; vortices shed; tip; instability tip ... See more keywords