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Showing 1 to 13 of 13 for “"Vortex Generation"”.
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Aerodynamic drag reduction of a racing motorcycle through vortex generation
… are more practical. Small metal vanes, known as vortex generators were used in this research to mix higher energy freestream air with the lower energy boundary layer, delaying boundary layer growth and separation. In testing performed in the West Virginia University Closed Loop Wind Tunnel a …
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An Investigation of Avian Wing Tip Vortex Generation Using a Biomimetic Approach
… and laser visualization testing highlighted the vortex generation of multiple primary feathers, as well as large-scale flow deviations in the vicinity of the feathers. A total pressure rake and total pressure probe were used to create detailed plots of the ratio of the local velocity to …
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Longitudinal Vortex Generation to Enhance the Performance of Compact Heat Exchangers: Flow and Heat Transfer Behavior for Plain and Interrupted Fins
The numerical results are used to guide the first full-scale implementation of a VG-enhanced multi-louver heat exchanger. The heat transfer and pressure drop performance under both dry- and wet-surface conditions were determined through wind-tunnel experiments. Average heat transfer enhancements of …
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Investigation of flow characteristics in an open channel with one-line semicircular vegetation patches
… velocity distribution, turbulent intensity, and vortex generation are analyzed. The resistance force offered by a vegetation patch causes the change in water depth which have a broader application in river management, bank stabilization, and flood control. The measurement is conducted in the …
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Investigating the Effect of an Upstream Spheroid on Tandem Hydrofoils
… body to determine how the body affects thrust generation and the unsteady flow field.</p> <p>The combined time-averaged thrust increases with Strouhal number, and is highest when the foils pitch out of phase with each other. At intermediate phase differences between φ = 0 and φ = π the leading …
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Effect of self-excited acoustic perturbations on flow characteristics around rectangular cylinders with varied geometrical aspects
… incidence angles in modulating flow structures, vortex generation, and wake dynamics. The combined effect of a small angle of incidence and self-excited acoustic resonance was found to have an added streamwise length effect. This research emphasizes the significant influence of incidence angles …
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The influence of steps topography on the behavior of density currents – a numerical study
… the flow behavior, the k-e model represents vortex generation poorly and the two-dimensional LES model represents only weak eddy dissipation.
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Effect of End-Plate Tabs on Drag Reduction of a 3D Bluff Body with a Blunt Base
… corresponding Re = 41,400, 82,800, 124,200 where vortex shedding occurs. The model with tabs shows no such peaks in power and therefore has attenuated vortex generation in the wake flow at that location.</p> <p>The second phase of testing was pressure testing the model through the use of pressure …
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Vortex-enhanced heat transfer by a new delta-winglet array
… lower for air than for liquid or two-phase flow. Vortex generation has emerged as a promising method for enhancing air-side heat transfer. Compared to fin interruption, this technique has the advantage of low cost and ease of implementation, and is usually accompanied by a modest pressure drop …
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Critical flow velocity in super fluid 3He-B
… in driving force. This behaviour might be due to vortex generation around the vibrating object and a subsequent shielding effect, previously observed in the response of a large vibrating wire (with diameter of 100 µm, similar to a typical fork dimension). Intriguingly the detailed behaviour also …
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Characterization of inclined oscillating jets and crossflow interaction for use in active flow control
Phase-locked stereoscopic PIV measurements were conducted to understand the interaction of inclined fluidic oscillator jets with a crossflow across a range of different blowing ratios. The fluidic oscillators used in the current study featured rounded internal feedback channels and produced …
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Unsteady Aerodynamics of Wing–Vortex Gust Encounters
… encounters between isolated spanwise vortex gusts and a simplified flat plate wing, with the aim of demonstrating transient gust load alleviation. Three sets of experiments are conducted in a water towing-tank facility. Force balance and planar particle image velocimetry data is …