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Showing 1 to 9 of 9 for “"Vortex control"”.
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Extracting energy from unsteady flows through vortex control
Vortex control is a new paradigm in fluid mechanics, with applications to propulsion and wake reduction. A heaving and pitching hydrofoil placed in a flow with an array of oncoming vortices can achieve a very high propulsive efficiency and reduced wake signature. The canonical example of flow with …
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Extracting energy from unsteady flows through vortex control
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994.
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Experimental Investigation of Active Wingtip Vortex Control Using Synthetic Jet Actuators
… Without actuation, the footprint of the tip vortex was present on the upper surface of the wing. With actuation on, the footprint disappeared suggesting the vortex was pushed off the wingtip by the jet. It is possible that the increased lift with actuation can be caused by the vortex being …
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Numerical Simulation of Plasma-Based Actuator Vortex Control of a Turbulent Cylinder Wake
… turbulent wake of a circular cylinder that is controlled by a plasma actuator. The numerical investigation implements a straightforward moving wall boundary condition to model the actuator's effects on the flow. Validations of the moving wall for this simulation are set forth with the …
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Vortex control of two-phase refrigerant flow in nozzles and its application in ejector vapor compression cycles
Vortex control is a novel two-phase convergent-divergent nozzle restrictiveness control mechanism which achieves flow control by adjustable nozzle inlet vortex strength. The nozzle can become more restrictive with increasing inlet vortex strength. Vortex control can potentially provide flow control …
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A Computational Study of Axial Compressor Rotor Casing Treatments and Stator Land Seals
… of these features. It was found that rotor tip vortex control plays a large part in the surge margin gains from a circumferential groove casing treatment. The efficiency gains of knife seals were dependent primarily on the gap size of the seals.
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Knotting of optical vortices
… solutions. We show that a wide range of vortex topologies are possible and report an experimental implementation of the technique. We also consider the Helmholtz and Schr¨odinger equations and attempt to construct solutions to these equations with knotted phase singularities. We conclude …
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Optimization of a Vertical-Axis Wind Turbine Airfoils Using Machine Learning, Numerical and Experimental Methodologies
… in lift generation, drag reduction, and vortex control. Experimental validation using a 3D-printed scale model in an open circuit wind tunnel further substantiated the CFD findings. Across all AoAs, the AI-optimized airfoil—particularly with endplates—demonstrated superior aerodynamic …
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Effects of Interfaces and Interactions between Multiphase Flow and Solid on Engineering Structures
… to non-periodic excitations, can be diagnosed. Vortex control of fluid flow over circular cylinders with detached plates are conducted numerically to develop a comprehensive understanding of the complex interactions a between fluid and structure, which is significant in aeronautic engineering. …