水轮发电机镜板泵外循环技术

本文提出了大型高转速水轮发电机镜板泵的参数设计范围,并在3000t推力轴承试验台上试验测试了镜板泵外循环的性能参数。结果表明,所设计的镜板泵参数合理,能够满足大型高转速水轮发电机的需要。     

大型水轮发电机推力轴承外加泵外循环冷却技术

本文介绍了大型水轮发电机推力轴承外加泵外循环冷却技术,分析了推力轴承瓦冷却技术特性.对大型水轮发电机推力轴承的外加泵外循环冷却技术设计提出了建议.     

水轮发电机轴承甩油原因分析及处理

以某电站水轮发电机轴承部件甩油的治理过程为例,介绍了油雾产生的原理,轴承甩油的原因、处理方案和效果,为水电站治理机组轴承部件的甩油问题提供了借鉴。     

CAD在水轮发电机设计中的应用

ＣＡＤ在水轮发电机设计中的应用杨树人，李林（昆明电机厂）ＡｐｐｌｉｃａｔｉｏｎｏｆＣＡＤｔｏｔｈｅＤｅｓｉｇｎｆｏｒＨｙｄｒｏｇｅｎｅｒａｔｏｒ￥ＹａｎｇＳｈｕｒｅｎ；ＬｉＬｉｎ（ＫｕｎｍｉｎｇＥｌｅｃｔｒｉｃＭａｃｈｉｎｅｒｙＷｏｒｋｓ）１前言昆明...     

大型水轮发电机推力轴承瓦温度

本文介绍了大型水轮发电机推力轴承瓦温度的概况及推力轴承的特性,分析了推力轴承瓦温度的限值。对推力轴承瓦温度的限值提出了建议。     

水轮发电机推力轴承润滑性能分析

对江口贾流式水轮发电机组推力轴承进行了研究。优选了轴承的支承结构，用有限元程序对推力轴承热弹性流体动力润滑性能进行了分析。并与其它贯流机组推力轴承进行了对比分析。2年多的稳定运行表明，所设计的江口推力轴承具有较好的性能。     

电磁与密封作用下水电机组振动的参数敏感性分析

从水轮发电机偏心转子的气隙磁场能表达式入手,推导电磁刚度矩阵,分别采用八参数模型和非线性Muszynska模型模拟水轮机转轮密封,综合考虑电磁与水力密封振源,建立由三个导轴承支承的机组轴系统三维有限元模型,分析电磁参数、密封参数、导轴承刚度及大轴外径等参数对轴系临界失稳转速的影响。为水电机组的动力设计及优化运行提供参考和依据。     

三峡大型水轮发电机组保护配置实现

简单介绍了三峡工程以及右岸机组配置及机组参数的一些情况,以及WFB-800发变组继电保护装置的技术特点。针对三峡右岸大型水轮发电机组的具体情况,介绍了WFB-800发变组继电保护装置在三峡右岸大型水轮发电机组保护实现上的应用,说明了如何实现双套主保护,双套后备保护,双套异常运行保护的配置方案,并论述了在实现主保护时应用的一些新技术,同时针对三峡右岸大型水轮发电机组一些特殊保护,较为详细地说明了所采用的实现方法。     

水轮发电机定子三维温度场的有限元计算

建立水轮发电机定子三维温度场计算的数学模型和泛函,用有限元法对水轮发电机定子1／2轴向长度的三维温度场进行求解,得到任意一个截面及沿轴向方向的温度分布曲线。对一台320MW的水轮发电机进行计算。结果表明,定子最高温度值与实测值基本相符。     

水轮发电机转子三维温度场的有限元计算

建立水轮发电机转子三维温度场计算的数学模型,用有限元法对水轮发电机转子1／2轴向长度的三维温度场进行求解,给出任意一个截面的温度分布曲线。对一台320MW的水轮发电机进行了数值计算。结果表明,最高温度值与实测值基本相符。     

Measurement of Faraday current in a disk MHD generator

The Faraday current flowing in a circumferential direction in a disk MHD generator was successfully measured using the Rogowski coil method. This fact allowed us to estimate the radial distributions of fluid and electrical properties, such as the gas flow velocity, Hall parameter, and electrical conductivity, from the experimental data. In this paper, a system for measuring the Faraday current measuring system and its calibration method are described in detail. As an example of the experimentally estimated properties, factors governing total pressure reduction along the radial direction are described. © 1998 Scripta Technica, Electr Eng Jpn, 125(4): 19–25, 1998     

Power control of coupled nonequilibrium disk MHD generator and line-commutated inverter system

A new power control method is proposed which is suitable for the MHD power generation system which consists of nonequilibrium disk generator and line-commutated inverter. The thermal input of the generator is controlled by changing the inlet stagnation pressure, whereas the seed mass flow rate instead of the inlet stagnation pressure is utilized as a manipulated variable of power control system. It is possible that the proposed method can realize both high performance for part load operation and fast output power control of which the time constant is much shorter than the response time of thermal input. Numerical simulations are carried out for the MHD power generation system connected to infinite bus and then it is confirmed that the system is stable and shows excellent power control performance.     

Numerical performance simulation of frozen helium plasma disk MHD generator

MHD electrical power generation with frozen helium plasma (FHP) is examined numerically. The FHP can be initiated by preionized helium without the alkali metal seed at the generator inlet. Since the three‐body recombination coefficient of helium ions is low at electron temperatures above 5000 K, the ionization degree can be kept almost constant in the entire region of the generator channel. The r?θ two‐dimensional numerical results show that the performance of the FHP MHD generator is comparable to that of the seeded plasma MHD generator, if the additional power consumed to preionization is ignored. In the FHP MHD generator, the ionization degree at the inlet should be controlled precisely, as well as the seed fraction in the seeded plasma MHD generator. Under an adequate inlet ionization degree for sustaining the FHP plasma, the plasma maintains the uniform structure. On the other hand, a slightly excess ionization degree causes a strong Lorentz force in the upstream region of the generator, deteriorating the generator performance. © 2002 Wiley Periodicals, Inc. Electr Eng Jpn, 140(3): 26–33, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10030     

锅炉给水泵组轴端密封循环液冷却系统的改进

介绍了对50CHTA/7型锅炉给水泵及前置泵的轴端密封循环液冷却系统的改进方法，通过改进提高了设备运行的可靠性，降低了设备大、小修的检修工作量。     

Transient phenomena of disk MHD generator due to change of load resistance

The results of an experimental study on transient phenomena in a closed cycle disk MHD generator are described in this paper. The transient phenomena were caused by a steplike change of load resistance during testing of the shock‐tube driven disk MHD generator. The load resistance was varied by using an IGBT (insulated gate bipolar transistor) installed in the load circuit. When the load resistance was changed from 0.096 Ω to 2.5 Ω, overshoot of the Hall output voltage and of the Hall electric field was observed, and a large fluctuation of static pressure was also observed. At the same time, a spikelike increase of the cesium recombination continuum and line spectrum appeared just after the load change. The results of quasi‐one‐ dimensional numerical simulation indicate that the observed overshoot was caused by the following phenomena: (1) a steep reduction of the Hall current and a steep increase in both the Faraday current and the electrical conductivity and (2) a slow reduction of the gas velocity due to the enhanced retarding force. Furthermore, the measured spikelike increase of the radiation intensity was ascribed to an increase of electron temperature and electron number density due to a steep increase of Joule heating. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 175(4): 34–42, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21004     

A design of a miniature ultrasonic pump using a bending disk transducer

If a pipe end is faced at a piston-vibrating surface with a small gap in liquid, the liquid is suctioned into the pipe. The present ultrasonic pump is based on this phenomenon to induce flow. For a low-profile configuration, we introduce a 30-mm-diameter bending disk driven by a ring-shaped PZT element bonded on the back of the disk. The disk vibrator is softly supported by frames via O-rings at its circumference, and is worked at the fundamental resonance frequency of 19 kHz of the bending mode. A pipe is installed perpendicularly to the center of the disk vibrator with a small gap. To improve the pump performance, we seek for the optimum vibration distribution of the disk vibrator. When the thickness around the disk center becomes large, the shape of the vibration distribution near the center approaches to a piston vibrator. If the flatness of the vibration distribution is defined as the vibration amplitude just under the pipe edge divided by the vibration amplitude at the disk center, it is 92.0% for the original bending disk. The flatness of the new design became 98.1% as a result of the optimization of the thickness profile of the disk. The pump pressure became high as the flatness became large when the gap size was small enough. The maximum pump pressure of 20.6 kPa was achieved when the vibration velocity at the disk center was 1.0 m/s and the gap size was 10 μm, while the maximum flow rate of 22.5 ml/min. was obtained with the input electrical power of 3.8 W.