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压实与摊铺之二 土的类型
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作者 苌楚 《工程机械与维修》 2003年第2期56-58,共3页
土根据其组成成分、地质年代以及物理特性,可分为不同的种类.决定压实效果的基本因素有:土的类型、含水量、物理特性、压实方式及其承载能力,因此在选择压实设备时,有必要了解该工程土的类型.
关键词 设备 原状土 粒度等级 压实阻力 坚硬度
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Studies on a low Reynolds number airfoil for small wind turbine applications 被引量:9
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作者 Joji WATA Mohammed FAIZAL +3 位作者 Boniface TALU Lesia VANAWALU Puamau SOTIA M.Rafiuddin AHMED 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第7期1684-1688,共5页
In contrast to large horizontal axis wind turbines (HAWTs) that are located in areas dictated by optimum wind conditions, small wind turbines are required for producing power without necessarily the best wind conditio... In contrast to large horizontal axis wind turbines (HAWTs) that are located in areas dictated by optimum wind conditions, small wind turbines are required for producing power without necessarily the best wind conditions. A low Reynolds number airfoil was designed after testing a number of low Reynolds number airfoils and then making one of our own; it was tested for use in small HAWTs. Studies using XFOIL and wind tunnel experiments were performed on the new airfoil at various Reynolds numbers. The pressure distribution, C p , the lift and drag coefficients, C L and C D , were studied for varying angles of attack, α. It is found that the airfoil can achieve very good aerodynamic characteristics at different Reynolds numbers and can be used as an efficient airfoil in small HAWTs. 展开更多
关键词 low Reynolds number AIRFOIL small wind turbines pressure distribution coefficient of lift coefficient of drag
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