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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41272

Title: Characteristics of flow configurations around side-by-side twin wind blades
Authors: Shun-Chang Yena;Chu-Hsuan Wua;Kuo-Ching San
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Keywords: Side-by-side wind blade;Flow visualization;Gap flow;Gap ratio;Aerodynamic performance
Date: 2017-04
Issue Date: 2017-02-13T06:35:39Z
Publisher: Experimental Thermal and Fluid Science
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 < 45°. The lift, drag, and pitching momentum on the lower wind blade decreased significantly due to the existence of upper wind blade. The effect of upper wind blade on the lower one deceased as g∗ increased.
Relation: 82,pp.302-313
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41272
Appears in Collections:[機械與機電工程學系] 期刊論文

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