Tip clearance effects on the performance of a hundred kW-class supercritical CO2 turbine

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-09-08 DOI:10.1016/j.supflu.2025.106780

Kang Yang , Zhijian He , Naxin Zhang , Laijie Chen , Zheng Qin , Lintao Wang , Keyong Dong , Hailiang Li , Xinyu Li , Huimin Liu , Jian Lan , Zhongshang Song , Zhenchang Fang , Xinqi Qiao

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引用次数: 0

Abstract

Supercritical carbon dioxide (S-CO₂) Brayton cycle technology offers significant efficiency and environmental benefits. The turbine, a core component, critically affects system performance. In hundred-kW-class S-CO₂ turbines, the large tip clearance-to-blade height ratio significantly impacts efficiency and flow characteristics. This study combines experiments and simulations to investigate tip clearance effects.Comparison of simulation results with experimental data validates the simulation method with a maximum discrepancy of 3.3 %, confirming its reliability. The results demonstrate that under design conditions, the CFD-simulated mass flow rate is 9.67 kg/s with an isentropic efficiency of 81.5 %, while experimental results show 9.35 kg/s and 83.9 %, respectively. Further analysis of different tip clearances reveals a near-linear relationship between clearance size and turbine performance. For every 0.25 mm increase in tip clearance, the mass flow rate decreases by approximately 0.04 kg/s, and turbine efficiency declines by 1.04 %. These findings provide valuable guidance for optimizing the design of hundred-kW-class S-CO₂ turbines.

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叶尖间隙对百千瓦级超临界CO2涡轮性能的影响

超临界二氧化碳（S-CO 2）布雷顿循环技术具有显著的效率和环境效益。汽轮机是影响系统性能的核心部件。在百千瓦级S-CO₂涡轮中，较大的叶尖间隙与叶片高度比会显著影响效率和流动特性。本研究结合实验和模拟研究了叶尖间隙的影响。仿真结果与实验数据的对比验证了仿真方法的有效性，最大误差为3.3 %，验证了仿真方法的可靠性。结果表明：在设计条件下，cfd模拟的质量流量为9.67 kg/s，等熵效率为81.5 %，而实验结果分别为9.35 kg/s和83.9 %。对不同叶尖间隙的进一步分析揭示了间隙大小与涡轮性能之间的近似线性关系。叶尖间隙每增加0.25 mm，质量流量下降约0.04 kg/s，涡轮效率下降1.04 %。这些研究结果为百千瓦级S-CO₂涡轮的优化设计提供了有价值的指导。

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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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.