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香港市场部分商品零售价格
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《粤港澳价格》 2003年第1期41-41,共1页
关键词 香港 零售价格 电冰箱 电风筒 电发梳
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Influential Factors of Bucket Foundation for Offshore Wind Turbine 被引量:2
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作者 丁红岩 刘永刚 +1 位作者 张浦阳 熊康平 《Transactions of Tianjin University》 EI CAS 2015年第3期264-268,共5页
In this paper, the influential design thctors of wide-shallow composite bucket foundation for 3 MW off- shore wind turbine are systematically studied by numerical simulation. The results show that the bucket diameter ... In this paper, the influential design thctors of wide-shallow composite bucket foundation for 3 MW off- shore wind turbine are systematically studied by numerical simulation. The results show that the bucket diameter is larger than 27 m in generak and the range of 7--12 m is appropriate for cylinder height. In particular the bucket foun- dation with diameter of 30 m and cylinder height of 10 m is suitable for most soils. Under ultimate loads, the bucket diameter and elasticity modulus of soil have major effects on the deibrmability of bucket foundation, while the influ- ence of friction coefficient between the bucket and soil is relatively slight. 展开更多
关键词 offshore wind turbine bucket foundation tilt angle soil parameter influential factor
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The Mechanism of Flow Field around a Rotating Cylinder with Fins for High Performance Magnus Wind Turbine
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作者 Nobuhiro Murakami Hiroaki Hasegawa +1 位作者 Toshihiro Haniu Masahide Nakamura 《Journal of Energy and Power Engineering》 2016年第1期23-31,共9页
Spiral Magnus is a unique wind turbine system that rotates with cylinders which have spiral-shaped fins coiled around them (instead of using the more common propeller-type blades). In the present study, three models... Spiral Magnus is a unique wind turbine system that rotates with cylinders which have spiral-shaped fins coiled around them (instead of using the more common propeller-type blades). In the present study, three models (cylinder with no fins, cylinder with straight fins and cylinder with spiral fins) were installed, and fluid force measurements were performed by a strain gauge force balance. A PIV (particle image velocimetry) system was used to better understand the flow fields around the cylinder. Considering the results of the experiment, it was confirmed that, the aerodynamic performance of the rotating cylinder can be improved by the fin. However, the straight fin makes the flow close to the cylinder surface ineffective. The rotary cylinder with the spiral fins was able to generate the greatest lift among three models, because the spiral fin effectively influences the vicinity of the cylinder surface. 展开更多
关键词 Wind turbine Magnus effect wind tunnel test spiral Magnus.
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