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A model for the extrapolation of the characteristic curves of Pumps as Turbines from a datum Best Efficiency Point

机译：从基准最佳效率点外推水轮机涡轮特性曲线的模型

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摘要

Pumps used as Turbines (PATs) are a viable and low-cost technology of energy converters suitable for small-scale and in-pipe energy generation from water resources. However, amongst the main barriers to PAT technology diffusion is the unavailability of the characteristic curves of most hydraulic pumps on the market when used as turbines. Several methods exist in the literature to derive the shape of head and power characteristic curves of a PAT knowing its Best Efficiency Point (BEP). Such methods based on fixed-coefficient polynomials have been assessed here in a cross-comparison and a new method was developed based on a database of 113 experimentally tested PAT curves, which proved to reproduce the behaviour of the sampled machines more accurately by improving the overall goodness of fit up to 60%, 37% and 5% according to the different selected indicators. Finally, the mechanical efficiency and system efficiency of a PAT under variable flow rates has been compared and contrasted with that of conventional hydro turbines.
机译：用作涡轮机（PAT）的泵是一种可行且低成本的换能器技术，适用于从水资源中进行小型和管道内发电。但是，PAT技术推广的主要障碍之一是市场上大多数用作涡轮机的液压泵的特性曲线不可用。文献中存在几种方法，可以知道其最佳效率点（BEP）来得出PAT的磁头形状和功率特性曲线。本文在交叉比较中评估了这种基于固定系数多项式的方法，并基于113个经过实验测试的PAT曲线的数据库开发了一种新方法，该方法被证明可以通过改善整体性能来更准确地重现被采样机器的行为。根据选择的不同指标，拟合优度分别高达60％，37％和5％。最后，将PAT在可变流速下的机械效率和系统效率与常规水轮机进行了比较和对比。

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