A Reduced-Order Model for the Preliminary Design of Small-Scale Radial Inflow Turbines

Marco Manfredi, M. Alberio, M. Astolfi, A. Spinelli
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引用次数: 1

Abstract

Power production from waste heat recovery represents an attractive and viable solution to contribute to the reduction of pollutant emissions generated by industrial plants and automotive sector. For transport applications, a promising technology can be identified in bottoming mini-organic Rankine cycles (ORCs), devoted to heat recovery from internal combustion engines (ICE). While commercial ORCs exploiting turbo-expanders in the power range of hundreds kW to several MW are a mature technology, well-established design guidelines are not yet available for turbines targeting small power outputs (below 50 kW). The present work develops a reduced-order model for the preliminary design of mini-ORC radial inflow turbines (RITs) for high-pressure ratio applications, suitable to be integrated in a comprehensive cycle optimization. An exhaustive review of existing loss models, whose development pattern is retraced up to the original approaches, is proposed. This investigation is finalized in a loss models effectiveness analysis performed by testing several correlations over six existing geometries. These test case turbines, operating with different fluids and covering a wide range of target expansion ratio, size, and gross power output, are then employed to carry out the validation procedure, whose results prove the robustness and prediction capability of the proposed reduced-order model.
小型径向流入水轮机初步设计的降阶模型
废热回收发电是一个有吸引力和可行的解决方案,有助于减少工业工厂和汽车行业产生的污染物排放。对于运输应用来说,一种很有前途的技术是用于内燃机(ICE)热回收的微型有机朗肯循环(ORCs)。虽然利用功率范围在数百千瓦到几兆瓦的涡轮膨胀器的商业orc是一种成熟的技术,但针对小功率输出(低于50千瓦)的涡轮机,还没有完善的设计指南。本工作为高压比应用的小型orc径向流入涡轮(RITs)的初步设计建立了一个降阶模型,适合集成在综合循环优化中。建议对现有的损失模型进行详尽的审查,其发展模式可以追溯到原始方法。通过测试六个现有几何形状的几个相关性,在损失模型有效性分析中完成了这项调查。这些试验用例涡轮机在不同的流体条件下运行,覆盖了广泛的目标膨胀比、尺寸和总功率输出,然后使用它们进行验证程序,其结果证明了所提出的降阶模型的鲁棒性和预测能力。
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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