水轮机效率曲线拟合的简便方法

针对水轮机效率曲线拟合传统方法存在的不足，平等地选取单位流量与单位转速作为自变量，建立其与效率值之间的二元高次多项式拟合函数模型，采用经典的最小二乘法确定其系数项，并利用MATLAB语言编程实现数据拟合和误差分析。通过实例分析验证，该方法模型简单，求解方便，具有较高的拟合精度和较强的适用性，易于计算机程序化实现。

A Simple Method of Hydraulic Turbine Efficiency Curve Fitting

Aiming to solve the existing deficiency of traditional turbine efficiency curve fitting, this paper equally chooses unit flow and unit speed as arguments, establishes two-argument high-order polynomial fitting function model between them and efficiency values, uses classical least squares to determine coefficients and realizes data fitting and error analysis by MATLAB. Through analyzing and verifying real example, it can be proved that this manner has a easy model to solve, has high fitting accuracy and applicability and can be easily come true by computer.