风电叶片用单向复合材料厚度变化研究与分析

风电叶片主梁帽通常采用单向经编织物,通过真空导入成型复合材料。由于真空导入工艺的特点以及织物参数的影响,都会对叶片设计带来一定的困难。选用国内外四种常用单行玻纤织物,研究了复合材料成型工艺和织物参数对复合材料厚度的影响。研究发现单向复合材料厚度与层数存在线性关系,而工艺参数对厚度影响不明显,织物参数对复合材料厚度有明显的影响。研究将为风电叶片设计提供一定支持,并为玻纤企业生产工艺参数调整提供了一定的借鉴意义。     

低压蒸汽节能回收改造总结

由于设计上的缺陷,导致废热锅炉副产的低压蒸汽不平衡,富余的低压蒸汽只能直接放空。为了降低能耗、节约生产成本,采用富余的低压蒸汽作为汽轮机的动能,由汽轮机拖动循环水泵,多余的能量用于发电。改造措施实施后,不仅回收利用了富余的低压蒸汽,而且具有明显的经济效益。     

燃汽轮机尾筒支架的工艺分析

针对燃汽轮机尾筒支架的加工与测量难点问题,重点介绍了尾筒支架的加工方法,并对工艺方法进行了分析。通过引入了多种工装夹具,加工中利用各加工基准面的转换,有力保证了尾筒支架的各主要尺寸的精度。     

绿色建筑中热电联供型微网的优化设计与运行

针对天津市某绿色建筑的热电联供系统,首先建立含电、热负荷并与电网连接的系统模型,该模型包括微型燃气轮机、光伏、储能装置;然后以规划期总成本净现值最小为优化目标进行优化设计,对天然气价格、电价和负荷变化进行敏感性分析;对系统各发电单元运行情况和系统配置方案的经济性进行分析。     

谈风电机组基础设计与构造要求

对风电机组基础的设计要点与构造要求进行了详细论述,包括设计资料的收集,基础底面尺寸的确定,基础设计与构造,以做出经济合理、安全稳妥的风电机组基础设计。     

Wind field simulation and wind‐induced responses of large wind turbine tower‐blade coupled structure

Herein, by a case study on a 5‐MW wind turbine system developed by Nanjing University of Aeronautics and Astronautics, the wind field simulation and wind‐induced vibration characteristics of wind turbine tower‐blade coupled systems is analyzed. First, the blade‐nacelle‐tower‐basis integrated finite element model with centrifugal forces induced by rotational blades is established. Then, based on a harmony superposition method and the modified blade element‐momentum theory, the fluctuating wind field of tower‐blade coupled systems is simulated, which considers wind shear effect, tower shadow effect, rotational effect, blade‐tower dynamic and model interaction effects. Finally, the wind‐induced dynamic responses and wind vibration coefficients of the wind turbine tower‐blade coupled structure are discussed through the ‘consistent coupled method’ previously proposed by us. The results indicate that the wind‐induced responses of a large wind turbine tower‐blade coupled structure present complicated modal responses and multimode coupling effect. Additionally, the rotational effect would amplify aerodynamic loads on blades with high frequency, wind‐induced dynamic responses and wind vibration coefficients of wind turbine tower. The centrifugal force effect could also amplify natural vibration frequency of the tower‐blade coupled system and reduce the wind‐induced dynamic responses and wind vibration coefficients of wind turbine tower. The research could contribute to wind‐resistant design of structure for a large‐scale wind turbine tower‐blade system. Copyright © 2014 John Wiley & Sons, Ltd.     

Effects of Various Geometric Features on the Performance of a 7:1 Pressure Ratio Deeply Scalloped and Split Radial Turbine in a Gas Turbine Engine

A 2 MW gas turbine engine has been developed for the distributed power market.This engine features a 7:1 pressure ratio radial inflow turbine.In this paper,influences of various geometry features are investigated including turbine tip and backface clearances.In addition to the clearances,the effects of the inducer deep scallop and exducer rounded trailing edge are investigated.Finally,geometric features associated with a split rotor(separate inducer and exducer)are studied.These geometry features are investigated numerically using CFD.Part of the numerical results is also compared to experimental data acquired during engine test to validate the CFD results.     

纤维增强复合材料风力发电机叶片性能检测综述

介绍了复合材料风力发电机叶片的特点、检测项目及相关技术标准、检测机构和检测能力.重点论述了复合材料风力发电机叶片材料性能试验和全尺寸试验情况,其中全尺寸试验主要包括静态试验、固有特性试验、疲劳试验、超声波检查试验、红外成像分析试验、声学检查试验、雷击试验等,对试验目的、原理及其研究状态进行了阐述.展望了本领域的技术发展趋势,对于复合材料风力发电机叶片的质量控制和性能可靠性有一定的参考价值.     

发电公司ETS故障原因分析

分析江苏徐塘发电有限责任公司7号机组ETS故障的原因,介绍了应急处理方法,并提出了电源改造的方案。     

实验室模拟风力机的研究

为了解决实验室风力机的模拟问题,提出了直流电机模拟风力机的方案。同时分析了风力机的运行特性及最佳风能利用原理,采用简单有效的转速、转矩控制,搭建风力机的Matlab仿真模型。该风力机模拟系统应用于变速恒频风力发电系统中,满足了双馈电机在不同状态下运行以及追踪最大风能的变速恒频发电运行等方面研究的需要。