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- W2557060520 abstract "Abstract The effects of gap ratio (g∗) and angle of attack (α) on side-by-side twin wind blades were investigated in an open-channel wind tunnel. Characteristic wake-flow patterns and aerodynamic performance were analyzed using smoke-streak flow visualization, hot-wire velocimetry, and six-force balancer. Seven smoke-streak flow patterns were defined – attached surface flow, wake instability wave, vortical wake, gap flow, bluff-body wake, anti-phase vortex shedding, and in-phase vortex shedding. For g∗ ≈ 0, the flow characteristics were similar to those of a single wind blade. As g∗ increased, these two wind blades induced the vortical wake, gap flow, and anti-phase vortex shedding modes. With further increase in g∗, the wake-flow patterns were similar to those behind a single wind blade. The hot-wire velocimeter detected that the maximum velocity fluctuation occurred at g∗ = 0.083. This velocity fluctuation decreased toward that of free stream as g∗ increased. The vortex-shedding frequency decreased as α increased. For a single wind blade, the maximum lift occurred at α = 10° and the drag increased with α. The pitching momentum increased with α when α" @default.
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- W2557060520 date "2017-04-01" @default.
- W2557060520 modified "2023-09-27" @default.
- W2557060520 title "Characteristics of flow configurations around side-by-side twin wind blades" @default.
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- W2557060520 doi "https://doi.org/10.1016/j.expthermflusci.2016.11.026" @default.
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