厚壁矩形带肋通道内蒸汽流动及传热特性

doi:10.13229/j.cnki.jdxbgxb20170246

摘要/Abstract

摘要： 针对厚壁带肋通道蒸汽冷却的问题,基于试验数据改进了含有内热源项的耦合传热计算方法;研究了壁厚对具有三维导热效应的厚壁矩形带肋通道内蒸汽流动及传热特性的影响;分析了肋高比e/D为0.047~0.188和肋角度α为30°~90°时厚壁带肋通道内蒸汽的流动和换热性能,并建立了反映通道壁厚δ、肋高比和肋角度对厚壁带肋通道传热特性影响的关联式。研究表明:壁面厚度对带肋通道流动及传热性能的影响较小,通道的传热性能随着壁厚的增大而降低。肋高比为0.141和0.047时,厚壁通道的综合性能因子分别达到了最高和最低;取肋片之间区域平均努塞尔数比时,60°厚壁带肋通道的综合性能因子最高,而取整个带肋壁面的平均努塞尔数比时,45°厚壁带肋通道的综合性能因子最高。

关键词: 动力机械工程, 带肋通道, 蒸汽冷却, 三维导热, 耦合计算

Abstract: To study the steam cooling in thick-wall ribbed channel, a conjugate calculation model was established on the basis of experiment data. The influence of the wall thickness on the flow and heat transfer characteristics of thick-wall ribbed channel with 3D heat conduction effect was investigated. The flow and heat transfer performance of steam in thick-wall ribbed channel for rib height-to-hydraulic diameter ratio (e/D) ranging from 0.047 to 0.188 and rib angle-attack ranging from 30° to 90° was also analyzed. Then, the relationship of Nu with wall thickness, e/D and rib angle was developed. The results show that the influence of the wall thickness on the flow and heat transfer performance of the ribbed channel is small, and the heat transfer coefficients of the channel decrease with the increase in the wall thickness. When e/D is 0.141 and 0.047, the comprehensive performance factor of the thick-wall ribbed channel reaches it maximum and minimum, respectively. When the Nu on the rib walls is not considered, the comprehensive performance factor of 60° thick-wall channel is the highest. When the average Nu is obtained from the whole walls, the comprehensive performance factor of 45° thick-wall ribbed channel is the highest.

Key words: power machinery engineering, ribbed channel, steam cooling, 3D heat conduction, conjugate calculation

中图分类号:

TK47

席雷, 徐亮, 高建民, 赵振, 王明森. 厚壁矩形带肋通道内蒸汽流动及传热特性[J]. 吉林大学学报(工学版), 2018, 48(3): 752-759.

XI Lei, XU Liang, GAO Jian-min, ZHAO Zhen, WANG Ming-sen. Flow and heat transfer characteristics of steam in thick-wall rectangular ribbed channel[J]. 吉林大学学报(工学版), 2018, 48(3): 752-759.

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