基于汽泡动力学特性的窄矩形通道内的CHF机理模型  

A new CHF mechanism model for a narrow rectangular channel based on bubble dynamics characteristics

作　　者：闫美月 潘良明[1,2] 马在勇 李想[1,2] 万灵峰 YAN Meiyue;PAN Liangming;MA Zaiyong;LI Xiang;WAN Lingfeng(Key Laboratory of Low-grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China;Department of Nuclear Engineering and Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]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 [2]重庆大学核工程与核技术系,重庆400044

出　　处：《核技术》2022年第10期101-109,共9页Nuclear Techniques

基　　金：国家重点研发计划(No.02120023710003);重庆市研究生科研创新项目(No.CYB21023)资助。

摘　　要：窄矩形通道因具有结构紧凑,换热面积大等优点而被广泛应用于各大热流领域。通过完善窄矩形通道中临界热流密度的预测方法,建立临界热流密度(Critical Heat Flux,CHF)机理模型,可以提高反应堆安全性和经济性。本文对窄矩形通道内竖直向上流动CHF进行了实验研究,并结合相关实验研究发现,对窄矩形通道中存在的两种典型的汽泡(滑移型汽泡和浮升型汽泡)进行分析验证。在此基础上,开发了一种基于窄矩形通道汽泡动力学特性的CHF机理模型,并提供一组本构关系用于封闭所开发的模型,同时使用实验数据对提出的模型进行评价,对比结果发现,新模型在窄矩形通道中预测结果良好,误差小于±30%。[Background]Narrow rectangular channels are widely used in major thermal flow fields because of the compact structure and large heat transfer area.[Purpose]This study aims to improve the prediction method of critical heat flux in the narrow rectangular channel and establishing the critical heat flux(CHF)mechanism model for the enhancement of reactor safety and economy.[Methods]CHF experiments was carried out in the present study to identify the dominant mechanism in a narrow rectangular channel at different gap sizes.The visualization experiments were performed at pressures ranging from 1 MPa to 4 MPa,inlet subcooling from 60 K to 120 K,and mass flux from 350 kg·(m^(2)·s)^(−1)to 2000 kg·(m^(2)·s)^(−1) .[Results]According to the visual experiment results,two typical bubble behaviors are investigated in the narrow rectangular channel.Based on the bubble dynamics characteristics of narrow rectangular channels,a new CHF mechanism model was proposed,and a set of constitutive relations will be provided to close the developed model.[Conclusion]A comprehensive assessment of new model has been conducted and analyzed by using the experimental data for the upward flow in a vertical narrow rectangular channel and it has good accuracies of less than±30%as relative to the experimental values.

关 键 词：临界热流密度 窄矩形通道 汽泡动力学 机理模型 

分 类 号：TL334[核科学技术—核技术及应用]