风力机叶片覆冰翼型气动性能的数值模拟（英文）

以某1.5 MW风机叶片S818翼型为研究对象,建立了翼型流场有限元分析模型。采用基于Reynolds平均的Navier-Stokes不可压缩粘性方程作为流动控制方程,对无冰翼型、霜冰、弦长冰及角冰翼型进行数值模拟分析,得到了-2°-20°攻角下不同厚度叶片翼型的升阻比、速度矢量和表面压力分布。研究结果表明:覆冰越厚,翼型的最大升阻比降幅越大。对于弦长冰和角冰在厚度达到一定值时,使得升阻比损失产生较大的突变。在覆冰厚度都为10 mm时,角冰的最大升阻比减幅最大,达到22.04%;其次是弦长冰为11.97%,霜冰的最小为6.41%。同时结冰后的翼型会提前进入失速区,导致桨叶气动性能恶化,降低了风机的功率系数。

End to End(E2E)Supply Chain Visibility-A Dynamic Capability View

In order to get a better understanding of supply chain visibility for creating strategic value,this paper uses a dynamic capability lens to reveal the nature of supply chain visibility.This paper identifies the importance of supply chain visibility in driving supply chain reconfigurability and consequently improving supply chain strategic performance.Empirical evidence shows that visibility has direct impact on supply chain strategic performance.It also supports that visibility is important for enhancing supply chain reconfigurability,thus creating strategic value in supply chains.Supply chain visibility therefore enables firms to reconfigure their supply chain resources for better competitive advantage.From the perspective of practitioners,the results display several insights into how managers should create strategic value from supply chain visibility.Prominently,managers or decision makers need to take advantage of supply chain visibility in order to use and recombine resources in value creation manner.