Abstract: According to the principle of least square method, the H-Q curve of the centrifugal pump is fitted with power function, polynomial and exponential function, and the error analysis of fitting curve is carried out by using the data of factory performance curve. The results show that the accuracy of fitting with polynomial is higher. After the fitting is completed, the centrifugal pump will have a certain deviation from the factory performance curve provided by the equipment manufacturer in actual operation. Because the number of pump operation data may be very small, the output performance curve is corrected by moving up and down from left to right. To correct the factory performance curve, the actual engineering data are used to correct the performance curve, which makes the corrected performance curve more applicable to actual production. An example analysis shows that the head is calculated to be 60 m without correction and 94 m after calibration. Assuming that a pump can provide a head of 60 m, if we use the pump scheme without correction, one pump is turned on, but in fact one pump is far from satisfactory. Therefore, the calibration of the pump's factory performance curve has a great influence on the subsequent pumping schemes.

Key words: Centrifugal pump, H-Q curve, Least square method, Fitting, Correction, Visual Basic

摘要： 泵的出厂性能曲线一般以图或数据的形式给出，与实际性能曲线存在一定偏差。根据最小二乘法原理，利用编程软件对离心泵的H-Q曲线进行幂函数、多项式以及指数函数拟合，运用出厂性能曲线数据对拟合曲线进行误差分析，结果显示多项式拟合的精确性更高。运用实际工程数据对性能曲线进行校正，并对校正后的曲线方程进行数据分析。结果表明，没有校正的计算扬程为60 m，校正后为94 m，假设一台泵能提供60 m的扬程，若采用没有校正的进行开泵方案设计，只开一台泵即可，但实际上一台泵远远达不到要求。

关键词: 离心泵, H-Q曲线, 最小二乘法, 拟合, 校正, Visual Basic