倾斜上升光管上母线处超临界压力水传热关联式的建立  

Establishment of Heat Transfer Correlation for the Supercritical Water Flow near the Upper Generating Line of an Inclined Upward Smooth Tube

作　　者：郭宇朦 李会雄[1] 张庆[1] 雷贤良[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2016年第1期72-77,123,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50876090);国家重点基础研究发展计划资助项目(2015CB251502)

摘　　要：为发展精度高、对不同倾角条件通用性强的倾斜上升光管内上母线处超临界压力水传热关联式,收集、整理了公开文献中非传热恶化工况条件下相关实验数据和传热关联式,并对现有关联式预测性能进行了分析和定量评价,发现现有关联式对倾斜上升光管内上母线处超临界压力水的换热系数的预测误差较大,且通用性差。考虑到物性变化以及光管与水平方向夹角对倾斜光管内超临界压力水传热的影响,建立了新的传热关联式。结果表明,新传热关联式预测误差较小,平均相对误差、平均相对绝对误差、标准偏差分别为0.88%、12.80%、16.68%,落在±30%误差带内的数据百分比为90.06%,其对不同倾斜角度的光管的通用性强,能够用来预测倾斜上升光管内上母线处超临界压力水在非传热恶化工况条件下的换热系数,对超(超)临界锅炉设计和安全运行具有重要的工程实际意义。In order to develop an accurate and universal correlation for predicting the heat transfer coefficient of the supercritical water（SCW）flow near the upper generating line in an upward smooth tube with different inclined angles,the existing empirical correlations were evaluated in this paper based on the collected experimental data from literature under the working conditions without heat transfer deterioration.It is shown that the prediction error of these correlations were quite large.Considering the effects of the SCW thermal physical properties and the inclined angle of the tube on heat transfer performance in a smooth tube,a new correlation was proposed.The prediction error of this new correlation was smaller compared with the existing empirical correlations and its mean relative deviation,mean relative absolute deviation and standard deviation are 0.88%,12.80% and 16.68%,respectively and 90.06% of the data fall within the error zone of ±30%.It means that the proposed correlation can be used to predict the heat transfer coefficient of the SCW flow near the upper generating line in an inclined upward smooth tube under the working condition without heat transfer deterioration,providing a basis for the design and safe operation of supercritical pressure boilers.

关 键 词：倾斜光管 超临界压力水 传热 关联式 

分 类 号：TK124[动力工程及工程热物理—工程热物理]