水泵全特性曲线的预测及对数值分析的影响

Prediction of pump′s complete characteristic curves and its influence on further numerical analysis

为了准确评估泵系统水力过渡过程特性并实施合理有效的水锤防护,基于水泵全特性曲线的Suter曲线表达形式,提出基于牛顿插值算法的水泵全特性曲线预测方法,进一步给出一种利用水泵基本特性曲线来修正水泵全特性曲线的数值变换方法.通过与常用的水泵全特性曲线预测拟合方法的比较,以及在泵站系统过渡过程计算中的应用分析,结果表明:基于牛顿插值算法的水泵全特性曲线预测方法应用方便,相比于常用的基于拉格朗日插值算法的曲线拟合方法,牛顿插值预测方法能灵活适应基础拟合数据的扩充,而且预测得到的水泵全特性Suter曲线是合理可靠的.经过水泵基本特性曲线修正后的Suter曲线,在提高泵系统水泵稳态计算工作点精度的同时,能较准确地反映水泵全工况的流量特性和能量特性,满足泵系统过渡过程计算分析的精度要求.

To evaluate the hydraulic transition characteristics of the pumping system,and conduct reasonable and effective water hammer protection,a newton interpolation algorithm-based prediction me-thod for the complete characteristic curve of the pump was proposed based on the Suter curves of the pump characteristics,and a numerical transformation method that uses the basic characteristic curve of the pump to correct the complete characteristic curve of the pump was further given.The comparison analysis with the commonly used methods for predicting and fitting the complete characteristic curve of water pumps was conducted,and the application analysis in the calculation of the transition process of the pumping system was introduced.The results show that the newton interpolation algorithm-based prediction method for pump′s complete characteristic curves is convenient for practical application,and this method flexibly adapt to the supplement of basic fitting data.Moreover,the predicted Suter curves of the pump are reasonable and reliable.These Suter curves can improve the accuracy of working para-meters as the pump system is in steady-state operation condition,and accurately provide the flow cha-racteristics and energy characteristics of the pump under complete conditions to meet the accuracy requirements for hydraulic transient analysis.