Performance analysis of scCO2 closed Brayton cycle applied to aero engine thermal protection considering flow and heat transfer characteristics inside the scCO2-fuel heat exchanger

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-09-17 DOI:10.1016/j.supflu.2025.106787

Xingjian Li , Yulong Li , Jingqi Li , Shijie Xu

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Abstract

To clarify the cycle performance considering flow and heat transfer characteristics inside the heat exchanger, this paper constructs a calculation model which combines heat exchanger model for an onboard scCO₂ closed Brayton cycle cooling system. Based on the model, the influence of fluid mass flow rate and flow heat transfer characteristics on cycle performance are clarified. The results indicate that the scCO₂ pressure losses inside the heat exchanger is the dominate factor on the cycle performance. The heat transfer deterioration inside heat exchanger caused by laminar flow area of fuel deteriorate the cycle performance. A critical fuel mass flow rate is found that the increase in fuel mass flow rate improves cycle thermodynamics performance below it and remains roughly constant above it. Furthermore, the increase in the heat exchanger’s flow area improves cycle thermal efficiency, however decreases the power-to-weight ratio of the heat exchanger, limiting its feasibility. Ultimately, recuperated layout can enhance system thermodynamic performance but deteriorate cooling performance.

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考虑scCO2-燃料换热器内部流动和传热特性的scCO2闭式Brayton循环在航空发动机热防护中的应用性能分析

为了明确考虑换热器内部流动和换热特性的循环性能，本文结合换热器模型构建了车载scCO2闭式布雷顿循环冷却系统的计算模型。在此基础上，阐明了流体质量、流量和流动换热特性对循环性能的影响。结果表明，换热器内scCO2压力损失是影响循环性能的主要因素。燃料层流区引起的换热器内部换热恶化使循环性能恶化。在一个临界燃料质量流量下，燃料质量流量的增加可以改善循环热力学性能，而在临界燃料质量流量以上循环热力学性能基本保持不变。此外，换热器流面积的增加提高了循环热效率，但降低了换热器的功率重量比，限制了换热器的可行性。最终，回热布局可以提高系统的热力学性能，但会降低冷却性能。

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.