摘要
为解决目前水轮机过渡过程计算中确定水轮机边界条件时通常使用的外特性法和内特性法的不足之处,结合这2种方法的优点,提出一种在水轮机过渡过程计算中处理水轮机边界条件的方法,即根据综合特性曲线的数据,利用统计分析方法和水轮机基本理论公式,计算水轮机基于内特性解析方程的基本参数,如出流角α、转轮出口安放角β、转轮出口相对宽度b2、导叶相对高度b0、转轮出口相对半径r2,在特性曲线上的规律。将求得的结果用于我国某电站机组甩负荷过渡过程的计算,得出了变量随时间的变化规律,计算结果与实际情况相符合。这种外特性法和内特性法相结合的方法,弥补了单独采用内特性法或外特性法计算特性曲线存在的问题,而且对小开度区特性曲线的研究具有一定的参考价值。
A simplified method was proposed to deal with the boundary condition at the turbine unit for transient calculation. This method is based on the statistical analysis of turbine hill chart and the Eular equation for water turbines. According to the Eular equation, the basic geometry parameters of the turbine, such as guide vane opening α, blade outlet angle β2, the relative blade width of outlet b2, the relative height of wicket gate b0 and the relative turbine exit radius 72 are obtained through curvilinear regression of the water turbine hill charts. As an example, the method was used to determine the boundary condition during transient calculation for a power station equipped with two Francis turbines and a surge tank. The simulated results are reasonable. The method is effective for estimating turbine characteristics under small opening conditions.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2006年第5期88-91,共4页
Journal of China Agricultural University
关键词
特性曲线
统计分析
水轮机
比转速
characteristics curves
statistical analysis
hydraulic turbine
specific-speed
作者简介
朱艳萍,硕士研究生;
时晓燕,副教授,博士,通讯作者,主要从事流体力学、地下热泵、流体机械及工程研究,E-mail:sxy36@163.com