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首页> 外文会议>7th Biennial Conference on Engineering Systems Design and Analysis 2004(ESDA 2004) vol.1: Advanced Energy Systems; Advanced Heat Transfer in Engineering Systems; ... >A ONE-DIMENSIONAL NUMERICAL MODEL FOR CALCULATING THE EFFICIENCY OF PUMPS AS TURBINES FOR IMPLEMENTATION IN MICRO-HYDRO POWER PLANTS
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A ONE-DIMENSIONAL NUMERICAL MODEL FOR CALCULATING THE EFFICIENCY OF PUMPS AS TURBINES FOR IMPLEMENTATION IN MICRO-HYDRO POWER PLANTS

机译：计算水力发电厂汽轮机效率的一维数值模型

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摘要

Increasing interest in renewable energy sources makes attractive the exploitation of many small power hydraulic resources (micro-hydro - less than 100 kW). However, the high cost of hydraulic turbines hinders the actual realization of micro-hydro plants. An alternative cheaper solution could be to replace the turbine with a reverse-mode centrifugal pump, developing therefore a pump as turbine (PAT) system. Unfortunately, although a wide number of centrifugal pumps are commercially available for micro-hydro engineering plant, manufacturers do not provide information regarding the performance of centrifugal pumps in turbine mode. In this paper, a simple method based on a one-dimensional numerical code is presented for deriving the turbine efficiency of commercially available centrifugal pumps. The code estimates a sizing of the component using information such as impeller diameter, specific speed, head and flow rate at pump BEP, machine overall dimension which are provided in manufacturer catalogues, to deduce geometrical parameters of the machine, calculating the losses and thus determining PAT performances. The method was validated by a comparison of the predicted characteristic curves with some experimental measurements available on PATs working in a range of specific speed (Head in meters and flow rate in m~3/s) from 9 to 65. The numerical code calculations effectively predicted the measured efficiency of PATs. At BEP, the efficiency was estimated with a relative error of ?10% which is a value much lower than one obtained by using the available in literature correlations. A prediction within this error range is generally accepted for this kind of application.
机译：对可再生能源的兴趣日益增长，吸引了许多小功率水力资源（微型水电-小于100 kW）的开发。然而，水力涡轮机的高成本阻碍了微型水力发电厂的实际实现。另一种更便宜的解决方案是用反向模式离心泵代替涡轮机，从而开发出一种作为涡轮机的泵（PAT）系统。不幸的是，尽管许多离心泵在商业上可用于微型水力发电站，但是制造商并未提供有关涡轮模式下离心泵性能的信息。在本文中，提出了一种基于一维数字代码的简单方法，用于推导市售离心泵的涡轮效率。该代码使用制造商目录中提供的信息（例如叶轮直径，比转速，扬程和泵BEP流量，机器总体尺寸）来估算组件的尺寸，以推断出机器的几何参数，计算损失并由此确定PAT表演。通过将预测特性曲线与一些实验测量值进行比较，验证了该方法的有效性，这些实验测量值适用于在9到65的特定速度范围内（以米为单位的扬程和以m〜3 / s为单位的流速）工作的PAT。有效地进行了数值计算预测了PAT的测量效率。在BEP处，效率的估计相对误差约为10％，该值比使用文献中的相关系数得出的值低得多。对于这种应用，通常接受在此误差范围内的预测。

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