风力机叶片气动设计与结构研究

采用Wilson模型优化设计水平轴风力机叶片的气动外形;利用有限元软件对玻璃钢叶片在风力、重力和离心力的耦合作用下的静力学、稳定性和动力学进行仿真分析.通过对叶片额定风况下的静力学和稳定性分析,不仅能获取叶片的应力和应变分布,而且可检验叶片设计的安全性和合理性.通过叶片动力学分析,计算叶片的振动频率,判断能否避免共振,实现正常运行.     

TiAl合金叶片铸造成形工艺研究

采用熔模精密铸造工艺制造TiAl合金叶片,通过对浇注系统设计、型壳制备工艺、熔炼浇注工艺的研究,实现了TiAl合金叶片完整成型。结果表明,合理设计浇注系统和型壳制备工艺可以减少集中缩孔、夹杂和气孔。     

手持叶片砂带磨床的研制

介绍了叶片的砂带磨削工艺方法及其手持叶片砂带磨削设备的主要结构,并经试验证明,该设备能高效、经济地解决采用手工磨削小型叶片的难题.     

复合材料风机转子叶片制造工艺的评价

本文主要介绍了制造风机叶片备选工艺的主要复合材料生产工艺，并对比其优缺点。根据其不同特点，选择适当工艺制造低成本高质量的叶片。     

航空发动机及燃气轮机叶片涂层概述

主要介绍了航空发动机和燃气轮机压气机叶片和涡轮叶片涉及涂层的分类、制备技术及主要性能指标;阐述了相关涂层的研究现状、发展趋势及存在问题,指明了后续这些涂层的重点攻关方向。     

Control of vibration and resonance in aero engines and rotating machinery – An overview

This paper presents an overview of the vibration problems which are experienced in running gas turbines, and other high-speed machinery. The primary problem is that of resonance, where response levels under dynamic loading can be 100 or 1000 times greater than the levels resulting from static loading of the same magnitude. These resonances can be caused by steady, non-oscillatory, forces being applied to a rotating disc and their prediction and observation from measurement under running conditions are essential capabilities for the machinery dynamics engineer. Additional problems can arise if instabilities are encountered, either from aerodynamic sources (flutter) or from rotor dynamics. In all cases where severe vibrations are encountered, they must be controlled by the introduction of extra damping to the critical components, usually by incorporating friction devices. The use of visual displays to illuminate and help to understand the complexities of vibration in rotating machinery structures is presented.     

气相色谱-质谱联用仪研究风电叶片用环氧树脂

本文采用气相色谱-质谱联用仪研究了四种风电叶片用环氧树脂的成分。结果发现:进口样品1#、2#、3#中双酚A(或F)环氧树脂所占的面积百分比分别为88.70%、83.48%、84.85%(其中双酚F占6.54%),比例大致相同;国产样品中双酚F占74.16%。进口样品1#、2#、3#和国产样品中的1,4-丁二醇二缩水甘油醚所占的面积百分比分别为5.52%、7.69%、7.76%和2.71%。     

基于Pro/E5.0的汽轮机叶片建模与加工仿真研究

为了解决汽轮机叶片复杂曲面的加工难题,采用Pro/E软件中的离散点文件编辑方式提高三维实体建模效率,并在建模基础上对汽轮机叶片的曲面多轴加工轨迹进行了研究,最后通过加工仿真功能验证了刀具路径的正确性.     

Experimental and computational studies on flow behavior around counter rotating blades in a double-spindle deck

Experimental and computational studies were performed to determine the effects of different blade designs on a flow pattern inside a double-spindle counter rotating mower deck. In the experimental study, two different blade models were tested by measuring air velocities using a forward-scatter LDV system. The velocity measurements were taken at several different azimuth and axial sections inside the deck. The measured velocity distributions clarified the air flow pattern caused by the rotating blades and demonstrated the effects of deck and blade designs. A high-speed video camera and a sound level meter were used for flow visualization and noise level measurement. In the computational works, two-dimensional blade shapes at several arbitrary radial sections have been selected for flow computations around the blade model. For three-dimensional computation applied a non-inertia coordinate system, a flow field around the entire three-dimensional blade shape is used to evaluate flow patterns in order to take radial flow interactions into account. The computational results were compared with the experimental results.     

编码器原理及其在风电控制系统中的应用

本文主要讨论增量式和绝对式旋转光电编码器如何在风电控制系统中准确测量变桨电机转子旋转速度和位置。以及双馈发电机转子转速的精确测量,实现对桨叶角度控制和双馈发电机的伺服控制。