| 摇摆条件下竖直圆管内干涸型临界沸腾的数值研究 |
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| 引用本文： | 祁伟,步珊珊,李振中,马在勇,张卢腾,陈德奇.摇摆条件下竖直圆管内干涸型临界沸腾的数值研究[J].核动力工程,2022,43(5):63-69. |
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| 作者姓名： | 祁伟 步珊珊 李振中 马在勇 张卢腾 陈德奇 |
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| 作者单位： | 重庆大学低品位能源利用技术及系统教育部重点实验室，重庆，400044 |
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| 摘 要： | 针对摇摆条件下竖直圆管内干涸型临界热流密度（Dryout CHF）进行了三维数值计算，研究了摇摆条件下竖直圆管内相态分布特性、圆管内临界热流密度（CHF）的位置以及最高壁面温度，同时对管壁沿程换热系数特性进行了分析。结果表明:在摇摆条件下，圆管内相分布呈现周期性变化，CHF的位置也会发生周期性变化；同时发现摇摆运动会导致壁面最高温度更高，因此摇摆条件会使沸腾临界现象更严重。随着流型转变和沸腾传热机制的变化，管壁换热系数沿流动方向也会显著变化。本研究可以为摇摆条件下Dryout CHF的数值预测提供参考。
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| 关 键 词： | 干涸型临界热流密度（Dryout CHF） 摇摆条件 壁面温度 换热系数 |
| 收稿时间： | 2021-10-22 |
Numerical Study on Dryout Critical Boiling in Vertical Circular Tube under Rolling Conditions |
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| Affiliation: | Key Laboratory of Low-Grade Energy Utilization Technologies & System, Chongqing University, Chongqing, 400044, China |
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| Abstract: | The three-dimensional numerical calculation of the dryout critical heat flux (Dryout CHF) in a circular tube under rolling conditions is carried out. The phase distribution characteristics, the location of critical heat flux (CHF) and the maximum wall temperature in the circular tube under rolling condition are studied, and the characteristics of heat transfer coefficient along the tube wall are analyzed. The results show that under the rolling condition, the phase distribution in the circular tube changes periodically, and the position of CHF also changes periodically; At the same time, it is found that the rolling motion leads to a higher maximum wall temperature, so the rolling condition will make the boiling critical phenomenon more serious. With the change of flow pattern and boiling heat transfer mechanism, the wall heat transfer coefficient will also change significantly along the flow direction. This study can provide a reference for the numerical prediction of dryout CHF under rolling condition. |
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