水轮机尾水管压力脉动分析方法研究

为掌握石家庄混合蓄能水电厂某水轮机尾水管的压力脉动特性.对水轮机尾水管压力脉动进行了现场测试.获得了多个工况下的测试数据.在测试数据的基础上,通过相空间重构理论,对尾水管压力脉动信号序列进行相空间重构,根据确定嵌入空间维数大小的嵌入定理.保证相空间容纳原状态空间吸引子的特征,选择恰当的嵌入维数m,计算其分形关联维数.再现动力学特性.研究结果表明,基于分形关联维的水轮机尾水管压力脉动状态分析方法是可行的.

Research on analytical method for pressure fluctuation in draft tube of water turbine

A field test is carried out on the pressure fluctuation in the draft tube of a water turbine in Shijiazhuang Mixed Pumped Storage Hydropower Station, so as to get the characteristics of it, from which the testing data of various operation modes are obtained. With these data, the phase space reconstruction for the signal serial of pressure fluctuation is made based on the Phase Space Reconstruction Theory. Moreover, by ensuring the character of the space containing space attractor under original condition and selecting a pertinent embedding dimension m in accordance with the Embedding Theorem, the dynamic characteristics of the system are reproduced by the calculation of fractal dimension. The result indicates that the fractal correlation dimension based dy- namic analytical method for pressure fluctuation in draft tube of water turbine is feasible.