Effect of Hub Configuration on the Performance of Mixed Flow Turbine for Micro Hydropower in Pipes

Volume 2: Fluid Applications and Systems; Fluid Measurement and Instrumentation Pub Date : 2021-08-10 DOI:10.1115/fedsm2021-63691

Seung-wan Jang, Ji-Hun Song, Youn-J. Kim

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Abstract

As environmental issues have been on the rise recently, the demand for hydropower is increasing. Micro hydropower in pipes is highly safe, sustainable, and easy to introduce. In this study, a mixed flow turbine is introduced to collect waste energy in pipes, and numerical analysis was conducted to estimate the performance. Efficiency was adopted as an indicator to evaluate the performance, and the performance of three different hub configurations, which are conical, convex, and concave, was investigated. The hydroturbine used in this study was modeled except for the guide vane due to the small scale, and the blade was designed using design of experiments. As a result, three different hub configurations have the best efficiency point between rotational speeds of 3000 rpm and 3200 rpm. The convex hub showed the highest efficiency, which was 1.60% and 3.63% higher than the conical and concave hub, respectively. It is related to the variation in the cross-sectional area of the flow path of the runner depending on the hub configuration. Consequently, the convex hub configuration showed the best performance.

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轮毂结构对管内微水电混流透平性能的影响

近年来，随着环境问题的日益严重，对水电的需求也在不断增加。管道微水电具有安全性、可持续性强、易于引进等特点。本研究引入了一种混合流涡轮来收集管道中的废能，并对其性能进行了数值分析。以效率为评价指标，对圆锥、凸、凹三种轮毂构型的性能进行了研究。本研究所用水轮机由于规模较小，除导叶外均进行了建模，叶片设计采用实验设计。因此，三种不同的轮毂配置在3000转/分和3200转/分的转速之间具有最佳效率点。凸轮毂的效率最高，分别比圆锥轮毂和凹轮毂高1.60%和3.63%。它与流道的横截面积的变化有关，这取决于轮毂的配置。因此，凸轮毂结构表现出最好的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 2: Fluid Applications and Systems; Fluid Measurement and Instrumentation

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