Measurement and Simulation of the Flow Field around a Triangular Lattice Meteorological Mast

The international standard IEC 61400-12-1 Wind turbines--Part 12-1： Power performance measurements of electricity producing wind turbines＂ aims to provide a uniform methodology that will ensure consistency, accuracy and reproducibility in the measurement and analysis of power performance by wind turbines. Annex G of this standard provides a methodology for the appropriate arrangement of instruments on the meteorological mast to ensure accurate measurement. For cup anemometers it provides recommendations about their location relative to the mast so that the effect of mast and boom interference on their output may be minimised. These recommendations are given for both tubular masts and lattice masts. This paper compares the flow distortion predicted by the IEC standard and the results of a 3D CFD （computational fluid dynamics） simulation of a triangular lattice mast. Based on the results of wind tunnel and CFD simulation it was found that the flow distortion surrounding the lattice mast was overpredicted by the method suggested in appendix G oflEC61400-12-1. Using the CFD data it was possible to determine, for a range of flow directions and mast heights, the distance from the mast that anemometers would need to be in order to be outside the flow distortion field.     

Numerical Flow Simulation in Turbine Mode of Counter-Rotating Type Pumping Unit to Cooperate with Wind Turbine

This serial research has proposed the hybrid power system combined the wind power unit with the counter-rotating type pump-turbine unit, to provide the constant output for the grid system, even at the suddenly fluctuating/turbulent wind circumstance. In this paper, the tandem impellers prepared for the counter-rotating type pumping unit were operated at the turbine mode, and the performances and the flow conditions were investigated numerically with accompanying the experimental results. Even though providing the pumping unit for the turbine mode, the maximum hydraulic efficiency is close to one of the counter-rotating type hydroelectric unit designed exclusively for the turbine mode. Besides, the runners/impellers of the unit work evidently so as to coincide the angular momentum change through the front runners/impellers with that through the rear runners/impellers, namely to take the axial flow at not only the inlet but also the outlet, without the guide vanes. From these results, it can be concluded that this type unit is effective to work at not only the pumping but also the turbine modes.     

燃气涡轮机导片与转子叶片交互作用的非定常流场数值模拟

采用ICEM-CFD软件建构O-H网格系统,分别模拟二种不同的涡轮导片及转子叶片间隙在转动效应下流场结构.模拟的数据与实验值做比较后,发现在涡轮导片及转子叶片流场预测上,已能有效预测流场的边界层流、分离流的发展以及导角叶片与转子叶片间的多震波的流场现象,另外亦能针对涡轮叶片压力总损失及轮机效率加以分析,为涡轮机的改进设计和优化提供了理论依据.     

2009年中国将成为世界最大的风机生产国

国际风能委员会秘书长Steve Sawver称,2009年中国将成为世界最大的风力涡轮机生产国,这将为迅速发展的可再生能源领域带来新变革。根据该机构的数据,虽然2007年风力发电仅占全球电力供应的1％,但发展迅速,到2020年风力发电将满足世界12％的电力需求,这将对控制全球气候变暖大有益处。     

Malama推出生物基PU硬泡风力涡轮片

<正>美国Malama公司日前采用植物基树脂生产聚氨酯硬泡,并从大豆、蓖麻、麻风树及海藻中提炼多元醇来生产用作涡轮机叶片的核心材料,这些材料比石油基材料更环保,具有坚固、质量轻、价格低等优点。使用生物基聚氨酯硬泡打造的核心材料能减轻叶片质量、提高叶片     

“风力茎杆”发电机

据国外媒体报道,传统风力涡轮叶片存在很大的噪音,有时蝙蝠和鸟类会意外撞击导致死亡,甚至一些风力涡轮机设置地点只有微风而已,无法实现风力发电。目前,美国纽约AtelierDNA设计公司最新提出了一种     

美国Malama公司推出生物基聚氨酯硬泡风力涡轮片

美国Malama公司日前采用植物基树脂生产聚氨酯硬泡,并从大豆、蓖麻、麻风树及海藻中提炼多元醇来生产用作涡轮机叶片的核心材料,这些材料比石油基材料更环保,具有坚同、质量轻、价格低等优点。使用生物基聚氨酯硬泡打造的核心材料能减轻叶片重量、提高叶片转速、简化安装过程,此外还能减少齿轮系统的摩擦,延长使用寿命,使叶片保持平衡,并最终提高整个风力涡轮机的工作效率。     

信息技术下的智慧新能源

新能源产业中的新商业机遇十分重要,这依赖于创新型企业如何通过先进的信息技术提高核心技术能力、加强企业内外部管理以及市场策略。时值国内新能源产业发展的"寒冬"期,风电企业发展放缓、光伏"双反"调查导致利率下滑,从软件到硬件、从仿真到管理,每一个层面的应用都将对企业的整体运营与核心技术突破产生巨大影响。     

风力发电机叶片制造技术发展动态

风能行业是世界上发展最快的纤维增强塑料用户之一。随着风力涡轮机不断增大,其生产技术也日益进步。涡轮机的叶片是制造工艺最复杂的部件,现在叶片最大长度已超过80m,而且还将变得更长。