迷宫密封传热特性的数值研究

晏鑫; 李军; 丰镇平

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迷宫密封传热特性的数值研究

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- 迷宫密封传热特性的数值研究
- Numerical Investigations on Heat Transfer Characteristics in Labyrinth Seals
- 西安交通大学学报 2012年46卷第11期页码：1-5+29
- 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：
  
  : 2012-05-01. 作者简介: 晏鑫(1983-), 男, 讲师. 基金项目: 国家自然科学基金资助项目(51106122);中央高校基本科研业务费专项基金资助项目
- DOI：
  中图分类号： TK262
- 网络首发：2012-11-10，
  
  纸质出版：2012
- 稿件说明：
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晏鑫, 李军, 丰镇平. 迷宫密封传热特性的数值研究[J]. 西安交通大学学报, 2012,46(11):1-5+29.

Numerical Investigations on Heat Transfer Characteristics in Labyrinth Seals[J]. 2012, 46(11): 1-5+29.
晏鑫, 李军, 丰镇平. 迷宫密封传热特性的数值研究[J]. 西安交通大学学报, 2012,46(11):1-5+29. DOI：

Numerical Investigations on Heat Transfer Characteristics in Labyrinth Seals[J]. 2012, 46(11): 1-5+29. DOI：

摘要

采用包含固体域和流体域的耦合传热数值求解方法

研究了典型燃气轮机迷宫密封的传热特性

并与实验值进行了对比.通过计算得到了2种间隙下13齿迷宫密封转子面和静子面附近的努力塞尔数Nu分布

计算值与实验值吻合良好.研究结果表明:在所考核的涡黏湍流模型中

由k-ω和SST湍流模型计算得到的Nu与实验值吻合良好

标准k-ε湍流模型和k-ε RNG湍流模型计算得到的Nu比实验值约高70%; 对于直通型光滑面迷宫密封

在静子面上

第1齿前区域的Nu沿轴向逐渐增大

齿后区域的Nu在某一值上下波动; 在转子面上

腔室区域的Nu沿轴向逐渐增大

齿尖区域的Nu有较大突跳.静子面上Re对迷宫密封平均Nu的影响大于转子面; 随Re的增加

静子和转子固体域的温度梯度逐渐增大

但Nu分布曲线的形状基本不变.

Abstract

By using the conjugated heat transfer computational method

heat transfer characteristics in the straight through the labyrinth seal used in a typical gas turbine were numerically investigated and the predictions were compared with the experimental data. At two different sealing clearances

the Nu distributions on the rotor and stator surfaces were computed for the smooth labyrinth seal with 13 fins. The calculated Nu distributions agree well with the experimental data in a range of Re numbers. The results show that the turbulence model has a significant effect on the heat transfer computations. Among the selected eddy viscosity turbulence models

the k-ω and SST models show superior accuracy to the k-ε and k-ε RNG models which over-predict Nu by about 70%. On the labyrinth seal stator

Nu increases in the axial direction before the first clearance while it fluctuates with a certain value after the first clearance. On the rotor surface

Nu increases in the axial direction in the chamber region and jumps sharply in the clearance region. The temperature gradients in the solid domains of the stator and rotor increase with an increase in Re

but the distribution profiles of Nu in the axial direction are nearly similar for each Re.

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Keywords

references

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晏鑫, 李军, 宋立明, 等. 蜂窝面迷宫密封内流动和总温升特性的研究 [J]. 西安交通大学学报, 2008, 42(7): 823-827, 869.

YAN Xin, LI Jun, SONG Liming, et al. Study on flow and total temperature increase of honeycomb labyrinth seals [J]. Journal of Xi'an Jiaotong University, 2008, 42(7): 823-827,869.

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