水力激振作用下的蓄能机组泵工况稳定性分析

发布时间：2018-06-28 08:56

本文选题：蓄能机组 + 水力激振　；参考：《南水北调与水利科技》2017年05期

【摘要】：随着我国蓄能机组的大量投运,水力激振所引发的机组稳定性问题日益严重。针对蓄能机组泵工况运行时的水力激振问题,采用现场试验手段获得了额定转速下蓄能机组调相压水工况与稳定泵水工况运行时的机组振动、摆度数据,采用频谱对比分析方法,研究了两种工况下各稳定性测点频谱,通过频谱中频率成分的变化,指出了不同部位测点中频率成分存在的差异。分析结果表明:承受垂直载荷部件振动幅值水泵工况较调相工况略有增大趋势;112.5Hz动静干涉频率成分主要在机组垂直振动方向上传播,且逐渐衰减;水力干扰导致泵工况部分测点的频率成分中增加了叶片通过频率56.25Hz和动静干涉频率112.5 Hz,但频率成分的增加并不一定引起机组振动与摆度混频幅值的增大;由于机组振动中261Hz等高频成分的出现,未来厂房与机组的动力分析报告中应包含高频成分,并进行复核。本次观测为转轮设计及研发人员提供了翔实参考数据。
[Abstract]:With the large number of storage units in our country, the stability problem caused by hydraulic excitation is becoming more and more serious. By using the method of spectrum contrast analysis, the frequency spectrum of each stable measuring point under two working conditions is studied. The differences of frequency components in different parts of the measured points are pointed out by the change of frequency components in the frequency spectrum. The results show that the vibration amplitude of the components subjected to vertical load is slightly larger than that of the phase modulation mode. The frequency component of 112.5 Hz static and static interference propagates mainly in the vertical vibration direction of the unit and gradually attenuates. Hydraulic interference results in the increase of blade passing frequency (56.25Hz) and static interference frequency (112.5 Hz), but the increase of frequency component does not necessarily increase the amplitude of vibration and shimmy mixing. Due to the occurrence of 261Hz and other high frequency components in the unit vibration, the dynamic analysis report of the future plant and unit should contain the high frequency component and review it. This observation provides detailed reference data for runner design and R & D personnel.
【作者单位】：国网新源控股有限公司技术中心;国家电网公司抽水蓄能技术实验室;
【基金】：国家自然科学基金(51309258) 国家电网公司科技项目(52573016001G;52573015000R)~~
【分类号】：TV734;TV743

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