SCO2单射流冲击传热的实验与计算研究

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
John Richardson, Ryan Wardell, Erik Fernandez, Jayanta Kapat
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引用次数: 0

摘要

摘要本文通过实验和计算研究了超临界二氧化碳(sCO2)单射流撞击的换热性能。计算得到的射流雷诺数范围在80000 ~ 600000之间,无量纲射流-靶面间距为2.8。在大多数实验中,CO2撞击射流的停滞条件保持在大约200 bar和400°C。目的是了解上述参数的变化如何影响工作流体和受热表面之间的传热。此外,由于空气和CO2之间的雷诺数升高以及热力学性质的差异,空气导出的撞击相关性可能不适用于CO2撞击;这些相关性是根据实验sCO2数据进行评估的。在本研究中,没有与sCO2功率循环相关的sCO2撞击数据。目标表面是一个直径1.5英寸的铜块,以3毫米孔为中心。在铜块的底部,云母加热器提供均匀的热流。嵌入在铜块中的热电偶用于确定表面温度。比较了实验sCO2数据的Nusselt数和空气导出的面积平均相关性。比较表明,当使用二氧化硅作为工质时,空气相关性大大低估了传热。在现有的空气相关性的基础上,利用所讨论条件下的实验数据推导了修正的sCO2相关性。此外,还进行了CFD研究,以进一步研究sCO2的传热特性,并评估该问题类型的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental and Computational Heat Transfer Study of SCO2 Single-Jet Impingement
Abstract This study experimentally and computationally investigates the heat transfer capability of supercritical carbon dioxide (sCO2) single jet impingement. The evaluated jet Reynolds number range is between 80000 and 600000, with a non-dimensional jet-to-target surface spacing of 2.8. CO2 impinging jet stagnation conditions were maintained at approximately 200 bar and 400°C for most experiments. The goal is to understand how changes in the aforementioned parameters influence heat transfer between the working fluid and the heated surface. Additionally, due to the elevated Reynolds numbers and difference in thermodynamic properties between air and CO2, air derived impingement correlations may not be appropriate for CO2 impingement; these correlations are evaluated against experimental sCO2 data. At the time of this study, no sCO2 impingement data was available relevant to sCO2 power cycles. The target surface is a 1.5- inch diameter copper block centered on the 3 mm orifice. At the bottom of the copper block, a mica heater provides a uniform heat flux. Thermocouples embedded in the copper block are used to determine the surface temperature. The Nusselt numbers from experimental sCO2 data and air derived area averaged correlations are compared. The comparisons showed that air correlations drastically underpredict the heat transfer when sCO2 is used as the working fluid. A modified sCO2 correlation using experimental data at discussed conditions, is derived based on an existing air correlation. A CFD study is also performed to further investigate sCO2 heat transfer characteristics, and assess the applicability to this problem type.
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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