弯扭叶片的设计思想、设计准则及其在汽轮机中的应用

根据对弯扭叶片的多年的研究和近几年来的使用经验，较系统地归纳出了弯扭叶片的设计思想和设计准则，对弯扭叶片的多种型面匹配准则和弯扭叶片叶列间的匹配准则进行了阐述，结合国产200MW汽轮机通流改造的实例，对上述思想及准则进行了验证。     

高性能风电叶片防护涂料的研制

分析了我国风电叶片防护涂料的现状,研制了一种高性能风电叶片防护涂料。该涂料具备优异的耐磨、抗高速粒子撞击性、耐候性和耐盐雾性能,还具备一定的防结冰性、防沾污和自清洁性。     

热处理温度对高速钢锯条锯切性能的影响

对高速钢锯条热处理过程中影响淬火温度准确性的因素进行了分析，探讨了淬火温度对高速钢锯条锯切性能的影响。     

Thermographic investigation of sandwich structure made of composite material

In this paper an experimental procedure, by means of thermographic technique, was set up in order to detect some typical defects, which could be found in composite material sandwich structures. The material thermal response was investigated for different artificially defects inserted in some specimens; every kind of defect was listed. Then the experimental procedure was applied to study a wind-turbine blade made of sandwich composite structure. The results fulfilled the expectations and confirmed the reliability of the thermographic technique to be used both in laboratory and in service.     

Characteristics of force acting on adjustable axial flow pump blade

The internal three-dimensional turbulent flow of adjustable axial-flow pump arrangement was simulated, and the force acting on the blade surface was calculated under different operating conditions. Based on the calculated results, finite element method (FEM) was adopted to analyze stress and strain distributions of the adjustment blade in different operations. Hydraulic moment, centrifugal moment and friction moment which must be conquered by adjusting the blades were also calculated. __________ Translated from Journal of Shanghai University (Natural Science), 2007, 13(3): 314–319 [译自: 上海大学学报]     

Performance and internal flow of sirocco fan using contra-rotating rotors

A sirocco fan using contra-rotating rotors in which an inner rotor is settled inside the sirocco fan rotor and each rotor rotates in an opposite direction was proposed for the purpose of getting the higher pressure and making the structure of a sirocco fan more compact. If the high discharge pressure is obtained with the adoption of the contra-rotating rotors, it could be used for various purposes. Pressure coefficient of a sirocco fan with contra-rotating rotors is 2.5 times as high as the conventional sirocco fan and the maximum efficiency point of contra-rotating rotors shifts to larger flow rate than a conventional sirocco fan. On the other hand, it was clarified from the flow measurement results that circumferential velocity component at the outlet of the outer rotor of contra-rotating ro- tors becomes larger than a conventional one. In the present paper, the performance of a conventional sirocco fan and a sirocco fan with contra-rotating rotors are shown and the internal flow field at the outlet of outer rotor of both cases is clarified. Then, the effect of different kind of contra-rotating rotors on the performance and internal flow field is investigated and the rotor design with higher performance would be discussed.     

硬质合金刀条线切割预成型技术研究

摆线齿锥齿轮用硬质合金刀条,在刃磨前刀条毛坯为矩形,如果将刀条直接用磨刀机床磨削,则既耗时又造成砂轮的大量磨损,成本较高。本文探讨了利用线切割技术对刀条进行预成型,将刀条毛坯首先切割至类似的形状,减少精磨的余量,以此降低成本,提高切割效率。     

Failure of last-stage turbine blades in a geothermal power plant

This paper presents an investigation into causes of failure of geothermal steam turbine blades. Several L-0 blades of geothermal steam turbines of 110 MW capacity suffered failures, causing forced outages of the turbines. To assess the causes of failure, the natural frequencies of the blades installed on the rotor were measured in the laboratory. The measured frequencies were compared with the natural frequencies calculated through a finite-element analysis (FEA) of the blade. The FEA was also used to calculate the vibratory stresses on the blade numerically. Also, the investigation analyzed the operational data and the history of the blade failures on several rotors of different units from the same system. The results of previous repairs were reviewed, and metallurgical investigations were conducted to identify the mechanical and metallurgical modes of failure. The results of the investigation showed that the fracture of two blades was attributed to installation and manufacturing errors and aggravated by general deterioration of the blades. The deterioration was caused by the erosion and corrosion process that resulted from moisture condensation in the steam.     

导叶闭合状态下立面间隙的接触分析

本文基于三维带摩擦的接触分析理论，建立了水轮机导叶在闭紧状态下的力学模型、导叶立面接触力及接触间隙的分析方程、确定了计算方法、开发了专用软件。使水轮机导叶立面的研究水平得到明显提高。