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首页> 外文会议>First Joint Conference IAHR-IWA on Pumps, Electromechanical Devices and Systems Applied to Urban Water Management Vol.2; 2003; Polytechnic University of Valencia Spain >Experimental study on the performances prediction methodologies of pumps and their systems
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Experimental study on the performances prediction methodologies of pumps and their systems

机译：泵及其系统性能预测方法的实验研究

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摘要

According to the hydraulics theory, analyses of hydraulic losses in pumps and their systems have been conducted. It is put forward that affecting efficiency modification from model to prototype is the losses which are relative to Reynolds numbers, and local losses have no any scale-effect. Four new prediction formulas of pumps and their systems' performances have been formulated. Two axial-flow impellers, the specific speeds of which are 1250 and 1350 separately, are used to three input/output passages (standard testing pipes, tubular and dual-directions) for experiments. 31 experimental data are measured and recorded, and the regressing calculation of the relation between the index in the efficiency prediction formula and ratio of the speeds has been made. The results show that the index will reduce when the ratio increases. Then, by use of the new formulas, the performances have been forecasted. The forecasting results show the precision is higher than that of other methods, and the optimal efficiency point has a move to smaller discharge and the most efficiency has a little decrease compared with other methods.
机译：根据水力学理论，对泵及其系统的水力损失进行了分析。提出了影响效率从模型到原型的修正是相对于雷诺数的损失，而局部损失没有任何规模效应。制定了四个新的泵及其系统性能的预测公式。两个轴流式叶轮（分别比速分别为1250和1350）用于三个输入/输出通道（标准测试管，管状和双向）。测量并记录了31个实验数据，并对效率预测公式中的指标与速度比之间的关系进行了回归计算。结果表明，该指数随着比率的增加而降低。然后，通过使用新公式，可以预测性能。预测结果表明，该方法的精度高于其他方法，最佳效率点趋向于减小排放量，而最大效率则比其他方法有所降低。

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