高月,张丽,海笑,李洋,杨帆,李鹏飞,王长顺

• 1:辽宁石油化工大学石油天然气工程学院
• 2:辽宁石油化工大学机械工程学院

摘要(Abstract)：

针对发动机换热器的冷却问题，开展了超临界压力下氢气在竖直管和U形管内流动传热特性研究。采用数值方法研究了压力和质量流率对管道换热的影响，从而得到换热规律，深入讨论弯管段的换热机理，分析了无量纲力对换热的影响。结果表明：压力贴近拟临界或质量流率增大均会增加对流换热系数，产生换热强化；U形管的弯管段可有效强化换热，在θ=90°附近达到峰值；入口直管段存在浮升力作用，但当压力高于2.0 MPa时，由于密度差影响，浮升力作用在弯管段后可忽略；由二次流引起的迪恩涡是强化弯管段换热性能的主要因素，其中对入口段的影响显著弱于出口段。

关键词(KeyWords)： 氢气;超临界流体;U形管;传热特性;迪恩涡

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目（52006094）;; 辽宁省教育厅基本科研项目（LJKMZ20220725）~~

作者(Author): 高月,张丽,海笑,李洋,杨帆,李鹏飞,王长顺

DOI: 10.19666/j.rlfd.202404080

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