Numerical Simulation for Flow and Heat Transfer Characteristics in Steam-Cooled Square Ribbed Channel

doi:10.7652/xjtuxb201603010

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Numerical Simulation for Flow and Heat Transfer Characteristics in Steam-Cooled Square Ribbed Channel

更新时间：2025-07-09

- Numerical Simulation for Flow and Heat Transfer Characteristics in Steam-Cooled Square Ribbed Channel
- Vol. 50, Issue 3, Pages: 62-67(2016)
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201603010
  CLC： TK474.7
- Online First：10 March 2016，
  
  Published：2016
- 稿件说明：
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Numerical Simulation for Flow and Heat Transfer Characteristics in Steam-Cooled Square Ribbed Channel[J]. 2016, 50(3): 62-67.
DOI：

Numerical Simulation for Flow and Heat Transfer Characteristics in Steam-Cooled Square Ribbed Channel[J]. 2016, 50(3): 62-67. DOI： 10.7652/xjtuxb201603010.

摘要

为了阐明蒸汽冷却带肋矩形通道的换热增强机理

基于三维RANS方程和标准k-ω湍流模型

数值模拟了带肋矩形通道的流场和换热特性

研究了雷诺数、入口宽高比和肋间距对流动和换热特性的影响

进一步分析了努塞尔数与雷诺数、入口宽高比、肋间距之间的关系

由此得出带肋矩形通道的传热关联式。结果表明:肋片的存在破坏了较厚的换热边界层

增强了换热性能。雷诺数增大

平均努塞尔数、综合换热因子均增大

阻力系数小幅上升; 宽高比增大

平均努塞尔数、综合换热因子均增大

阻力系数大幅上升; 肋间距增大

平均努塞尔数增加

阻力系数先增后减

综合换热因子先减后增。所得传热关联式可为先进燃机蒸汽冷却叶片的设计提供参考。

Abstract

To clarify the underlying principle of heat transfer enhancement in a steam-cooled square ribbed channel

the flow field and heat transfer characteristics of a square ribbed channel were numerically simulated by 3-D steady RANS equations coupled with standard k-ω turbulence model. The influences of Reynolds number

inlet aspect ratio and rib pitch on the flow and heat transfer characteristics were investigated

the heat transfer correlation of square ribbed channel was analyzed

and then the relationship of Nusselt number with Reynolds number

inlet aspect ratio and rib pitch was obtained. The result indicates that heat transfer enhancement is caused by the existence of ribs which destroy the thick heat transfer boundary layer. As Reynolds number grows up

the average Nusselt number and thermal enhancement factor increase while the friction factor increases slightly. Larger inlet aspect ratio also leads to greater thermal enhancement factor and better average Nusselt number

and the friction factor also increases obviously. The increase of rib pitch results in a growing average Nuusselt number. When the rib pitch increases

the friction factor increases firstly and then decreases

while thermal enhancement factor decreases firstly and then increases.

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references

史晓军, 税琳棋, 高建民, 等. 蒸汽冷却带肋矩形通道传热和压降实验关联式 [J]. 西安交通大学学报, 2013, 47(11): 1-6.

SHI Xiaojun, SHUI Linqi, GAO Jianmin, et al. Heat transfer and pressure drop correlations for rectangular channels with ribs [J]. Journal of Xi'an Jiaotong University, 2013, 47(11): 1-6.

SHI X, GAO J, XU L, et al. Experimental investigation on heat transfer and friction characteristics of ribbed rectangular channels using steam as coolant [J]. Proceedings of the Institution of Mechanical Engineers: Part A Journal of Power and Energy, 2013, 227(4): 426-437.

SHUI L, GAO J, SHI X, et al. Effect of duct aspect ratio on heat transfer and friction in steam-cooled ducts with 60 angled rib turbulators [J]. Experimental Thermal and Fluid Science, 2013, 49: 123-134.

SHUI L, GAO J, XU L, et al. Numerical investigation of heat transfer and flow characteristics in a steam-cooled square ribbed duct [C]∥ASME Turbo Expo 2010: Power for Land, Sea, and Air. New York, USA: ASME, 2010: 163-171.

SHUI L, GAO J, SHI X, et al. The effect of cooling conditions on convective heat transfer and flow in a steam-cooled ribbed duct [J]. Journal of Mechanical Science and Technology, 2014, 28(1): 331-341.

ELWEKEEL F N M, ZHENG Q, ABDALA A M M. Numerical study of turbulent flow through rib-roughened channels with mist injection [C]∥ASME 2014 Turbine Technical Conference and Exposition. New York, USA: ASME, 2014: V05AT12A011.

ZHU J, GAO T, LI J, et al. The effect of vortex core distribution on heat transfer in steam cooling of gas turbine blade internal ribbed channels [C]∥ASME 2014 Turbine Technical Conference and Exposition. New York, USA: ASME, 2014: V05AT12A005.

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