Extracting power from the excess pressure of urban water pipelines by in-pipe drag-based turbines is a newly developed method for clean energy production on a small scale. The performance improvement of these turbines as a sustainable and clean energy production device is subjected in this research by studying the effect of turbine blade geometry. In this regard, the focus of this research is on studying the performance of three common blade profiles for free flow drag-based turbines, including the S-Shaped, Semi-Elliptic, and Bach profiles. Firstly, using an existing test ring, the fabricated turbines with different blade profiles are experimentally tested. Numerical study is also performed and simulation accuracy is validated with the experimental results. After that a theoretical method is introduced for evaluation of the produced torque by turbines with different blade profiles. The outcome of these three methods unanimously proved that in case of in-pipe turbines, the turbine with Bach profile blades has better performance than the others. Also, the developed theoretical approach proved to be a fast and reliable method for performance evaluation of in-pipe turbines. Further analysis, which is performed by numerical simulations is used to show the flow field behavior around turbine in more detail. This is to distinguish the reasons for existing difference among the performance of the studied turbines.

中文翻译：

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叶片类型对基于阻力的管内水轮机性能影响的研究，以提高能量收集


通过管内拖动式涡轮机从城市供水管道的超压中提取电力是一种新开发的小规模清洁能源生产方法。本研究通过研究涡轮叶片几何形状的影响来提高这些涡轮机作为可持续清洁能源生产装置的性能。在这方面，本研究的重点是研究自由流阻力涡轮机的三种常见叶片型线的性能，包括 S 形、半椭圆形和巴赫型线。首先，使用现有的测试环，对制造的具有不同叶片轮廓的涡轮机进行实验测试。还进行了数值研究，并通过实验结果验证了模拟的准确性。然后介绍了一种评估不同叶片轮廓的涡轮机产生的扭矩的理论方法。这三种方法的结果一致证明，在管道内涡轮机的情况下，具有巴赫型叶片的涡轮机比其他涡轮机具有更好的性能。此外，所开发的理论方法被证明是一种快速可靠的管道涡轮机性能评估方法。通过数值模拟进行的进一步分析用于更详细地显示涡轮机周围的流场行为。这是为了区分所研究的涡轮机的性能存在差异的原因。