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通过分析水泵的全特性曲线,并利用通用公式和就近取值这两种方法,得到不同比转速的水泵全特性曲线的数值化离散数据,同时还分析了这两种方法所得数据的差异,最后通过工程实例进行停泵水锤计算,研究数值差异对大管径长距离平坦管道水力过渡过程的影响。结果表明,不同比转速的水泵全特性曲线具有较大差异,依据相似理论对水泵全特性曲线进行数值化改造在理论上是可行的;同类型水泵的全特性曲线差异不大,曲线数值化后也有相同的特点;对大管径长距离平坦管道进行安全的水锤防护时,应以管道稳压排气为主。
By analyzing the whole characteristic curve of the pump and using the general formula and the nearest value, the numerical discrete data of the full characteristic curve of the pump with different specific speed are obtained. At the same time, the differences of the data obtained by the two methods are analyzed. Finally, Through the engineering example, the water hammer calculation was carried out to study the effect of the numerical difference on the hydraulic transition process of the long pipelines with large diameter and long distance. The results show that the pump characteristic curves with different specific speed are quite different. Based on the similarity theory, it is theoretically feasible to carry out the numerical reconstruction of the pump full characteristic curve. The whole characteristic curve of the pump with the same type has little difference. After the curve is numerically Also have the same characteristics; for large diameter long-distance flat pipe safety water hammer protection, should be the main pipeline regulator exhaust.