计及可压缩性的水电站辅机管网时变系统计算研究

Compressibility analysis of hydraulic power plant auxiliary piping network system

水电站的油气水系统由于运行操作或事故的产生 ,其管网会产生“死点”或“死网”而使其实际结构发生变化。传统的管网计算方法 ,无法满足仿真对持续求解的要求。该文在考虑流动的阻尼的同时还考虑了流体的可压缩性 ,推导出相关的公式 ,并建立了数学模型 ,提出了计及可压缩性管网的结点法 ,编制了通用的程序从而使时变的管网系统得以持续求解 ,2个算例的计算结果准确 。

Malfunctions occur in hydraulic power plant auxiliary systems when the piping network is changed as a node or sub network is closed. Conventional analytical methods can not simulate such changes. This article presents an analytical model including the impedance and compressibility of the liquid. The model uses the compressibility node method which is based on the conventional node method. Simulated calculation has proved that the method in the paper could simulate real function changes. Two numerical examples show that the method is not only accurate, but also easy to develop an automatic piping network program.