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Development of an inline vertical cross-flow turbine for hydropower harvesting in urban water supply pipes

机译：开发用于城市供水管道中水力发电的直列式垂直横流式涡轮机

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Continuous and reliable power supply plays an important role for water leakage monitoring systems used in urban water supply pipes. Renewable energies powered water leakage monitoring system is becoming a promising way to reduce the dependence on traditional chemical batteries. In this study, an inline vertical cross-flow turbine was developed to harvest the potential hydropower inside water supply pipes for supplying power to the water monitoring systems. Specifically, numerical investigations are carried out on the block shapes of a water turbine system to determine an optimal model. The effects of tip clearance on the turbine performance are conducted and it is found that a smaller tip clearance can reduce the reversing torque on the returning blades and increase the pressure drop through the runner for improving the turbine performance. Besides, a self-adjustable vane is designed to avoid excess water head loss. The simulation results show that the proposed self-adjustable vane is effective to limit the water head loss at high flow velocities (1.5-2.0 m/s) to 5 m. Finally, the turbine prototype is fabricated and tested on a lab test rig. The experimental results indicate that the numerical method adopted in this research is accurate enough for such micro water turbine performance prediction. A month-long test shows that the daily electricity generation of the proposed turbine is about 600 Wh and the water head loss is always below 5 m, which means that the proposed turbine can provide sufficient power for any general water leakage monitoring system without influencing normal water supply. (C) 2018 Elsevier Ltd. All rights reserved.
机译：连续可靠的电源在城市供水管道中使用的漏水监控系统中起着重要作用。可再生能源动力漏水监测系统正在成为减少对传统化学电池依赖性的一种有前途的方法。在这项研究中，开发了一种直列式垂直横流式涡轮机，以收集供水管道内部的潜在水电，以向水监控系统供电。具体地，对水轮机系统的块形状进行数值研究，以确定最佳模型。进行了叶尖间隙对涡轮性能的影响，发现较小的叶尖间隙可以减小返回叶片上的反向扭矩，并增加通过转轮的压降，从而改善了涡轮性能。此外，自调节叶片的设计避免了过多的水头损失。仿真结果表明，所提出的自调节叶片可以有效地将高流速（1.5-2.0 m / s）到5 m时的水头损失控制在最小范围内。最终，涡轮机原型被制造并在实验室测试台上进行测试。实验结果表明，本研究采用的数值方法对于这种微型水轮机性能的预测是足够准确的。长达一个月的测试表明，该涡轮机的每日发电量约为600 Wh，并且水头损失始终低于5 m，这意味着该涡轮机可为任何通用的漏水监测系统提供足够的功率，而不会影响正常运行。供水。 （C）2018 Elsevier Ltd.保留所有权利。

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