Multi-objective optimization of an axial flow hydraulic turbine with a collection device to be installed in an open channel

Multi-objective optimization of an axial flow hydraulic turbine with a collection device to be installed in an open channel
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DOI：
10.1016/j.renene.2023.03.130
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发表时间：
2023-04
期刊：
Renewable Energy
影响因子：
8.7
通讯作者：
Y. Nishi;Hiromi Koga;Yi Hong Wee
Y. Nishi;Hiromi Koga;Yi Hong Wee
中科院分区：
工程技术1区
文献类型：
--
作者：
Y. Nishi;Hiromi Koga;Yi Hong Wee

文献摘要

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本研究以功率系数和轴向推力系数为目标函数，将单相流分析与优化方法相结合，提出了一种多目标优化设计方法，对带集流装置的轴流式水轮机转轮和集流装置同时进行优化。为了验证该设计方法的有效性，通过验证实验和多相流分析对优化后的涡轮特性进行了研究，并与单相流分析结果进行了比较。单相流分析结果表明，优化后的涡轮轴向推力系数与原涡轮相当，功率系数显著提高。然而，多相流分析结果表明，与原涡轮相比，优化后的涡轮轴向推力系数虽然有所提高，但功率系数明显高于单相流分析结果，这与单相流分析不同，这是由于涡轮效率显著提高，加载系数和进口速比也有所增加。这表明该设计方法在提高产量方面是有效的。
In this study, a multi-objective optimization design method was developed by combining, among other methods, single-phase flow analysis and the optimization method to simultaneously optimize the runner and collection device of an axial-flow hydraulic turbine with a collection device, using the power coefficient and axial thrust coefficient as objective functions. To verify the effectiveness of this design method, the characteristics of the optimized turbine were investigated through verification experiments and multiphase flow analysis, and were compared with the results of single-phase flow analysis. The results of single-phase flow analysis showed that the axial thrust coefficient of the optimized turbine was equivalent to that of the original turbine, while the power coefficient improved dramatically. However, the results of the multiphase flow analysis showed that although the axial thrust coefficient of the optimized turbine was increased compared to that of the original turbine, the power coefficient was significantly higher than that of the results in the single-phase flow analysis, due to a significant increase in the efficiency of the turbine, as well as an increase in the loading coefficient and the inlet velocity ratio, unlike the single-phase flow analysis. This indicates that this design method is effective in terms of output improvement.