滴灌加压泵站离心泵并联总流量分析模型

为了在滴灌加压泵站设计中,给并联工作离心泵数量的确定提供帮助,该文以并联水泵工况点的求解原理为基础,建立了分析离心泵并联总流量随并联数量的变化模型。模型分析结果显示,单泵工作流量随并联数量的增多而减小,而且减幅降低;离心泵并联总流量随并联数量的增多而增加,但是增幅衰减;而且其衰减速度大于单泵流量减幅的降低速度。利用设计实例验证了该模型的应用有效性。该研究可为滴灌灌区泵站设计提供参考。

Analysis model of total flow rate of centrifugal pumps in parallel operation for pressure pumping station of drip irrigation system

To determine the number of centrifugal pumps in parallel operation in the design of pressure pumping station for drip irrigation system, the models were developed on the principle of solving the duty point of pumps system operated in parallel to analyze the total flow rate of pumps system varied with the number of centrifugal pumps in parallel operation. It was obtained by the model analysis that the working flow rate of single centrifugal pump decreased with the number of parallel pumps, and the range of diminution decreased also; The total discharge of pumps system increased with the number of parallel pumps, but the range of increment decreased, which decay rate was large than that of single centrifugal pump flow capacity. An example was employed to verify the availability of the models for application. The results can provide a reference for design of pumping station for drip irrigation area.