王亚慧,雷贤良,刘云帆,方寅,李雨声

• 1:西安交通大学动力工程多相流国家重点实验室

摘要(Abstract)：

高性能超临界二氧化碳（S-CO_2）换热器是实现S-CO_2布雷顿循环系统高效紧凑化的关键核心设备，S-CO_2在光滑通道内换热系数较低，寻求高换热性能与低阻换热结构是发展高效紧凑式换热器的关键。采用五轴电火花成型技术制造出直肋管，通过实验方法研究了S-CO_2在四头直肋管内传热规律，系统分析了流动参数对直肋管强化传热特性影响，定量评估了直肋管与光管换热能力的差异；采用数值模拟方法研究了直肋管结构参数对强化传热和阻力特性的影响规律，获得最优的直肋管结构。结果表明：增加压力和质量流速可以降低壁面温度，提高对流换热系数，直肋管的平均换热能力是圆形光管的1.96倍左右；相较于圆形光管，直肋管可以有效延迟传热恶化发生，且使传热恶化延迟能力提升0.3～1.8倍；当固定肋宽0.5 mm，肋高2.5 mm，直肋管的综合换热能力最好，综合换热因子为1.58；而固定肋高为0.5 mm，高宽比0.33，直肋管的综合换热能力最好，综合换热因子为1.22。

关键词(KeyWords)： 直肋管;超临界二氧化碳;结构参数;强化传热;优化设计

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目（U1867218）;; 中国华能集团有限公司总部科技项目（HNKJ20-H87-04）~~

作者(Author): 王亚慧,雷贤良,刘云帆,方寅,李雨声

DOI: 10.19666/j.rlfd.202301010

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