刷式密封传热特性研究

邱波; 李军

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刷式密封传热特性研究

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- 刷式密封传热特性研究
- Investigation on the Heat Transfer Characteristics of Brush Seals
- 西安交通大学学报 2011年45卷第9期页码：94-100
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
  
  李军(通信作者),教授,博士生导师。基金项目: 国家自然科学基金资助项目(52376029)。
- 基金信息：
  
  : 2011-03-07. 作者简介: 邱波(1987-),男,博士生;李军(联系人),男,教授,博士生导师. 基金项目: 国家自然科学基金资助项目(50976083)
- DOI：
  中图分类号： TK474.7
- 网络首发：2011-09-10，
  
  纸质出版：2011
- 稿件说明：
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邱波, 李军. 刷式密封传热特性研究[J]. 西安交通大学学报, 2011,45(9):94-100.

Investigation on the Heat Transfer Characteristics of Brush Seals[J]. 2011, 45(9): 94-100.
邱波, 李军. 刷式密封传热特性研究[J]. 西安交通大学学报, 2011,45(9):94-100. DOI：

Investigation on the Heat Transfer Characteristics of Brush Seals[J]. 2011, 45(9): 94-100. DOI：

摘要

采用求解Non-Darcian多孔介质模型的完全雷诺平均Navier-Stokes(RANS)方程和能量方程的方法

在考虑刷丝束内部空隙、安装角和转轴旋转效应下

数值研究了刷式密封的几何结构参数

即刷丝束厚度、干涉量

以及刷式密封的运行工况参数

即转速和压差等

对单级刷式密封传热特性的影响规律

刷丝束多孔介质的内部阻力系数是利用Eugrn方程推导并经过实验数据校准确定的.研究结果表明:刷丝束厚度内的温度沿轴向近似均匀分布

刷丝束围栏高度区域内的温度沿径向呈指数迅速下降; 随着压差的增大

温度下降更加集中在刷丝束围栏高度区域内; 随着热流量增加

最高温度呈指数迅速升高; 随着刷丝束厚度增加

泄漏量减少

最高温度升高; 随着转速提高和刷丝束与转轴间的干涉量增大

最高温度升高.

Abstract

The leakage flow and heat transfer characteristics of a typical brush seal was numerically investigated using the Reynolds-averaged Navier-Stokes(RANS)equations and the energy equation based on the non-Darcian porous medium model. The influence of the bristle pack thickness and bristle interference

as well as the rotational speed and pressure difference

on the heat transfer characteristics of one stage brush seal was explored with consideration of the bristle pack lay angle

voids and the shaft rotation effect. The inertial and viscous resistance coefficients of the bristle pack porous domain were estimated by the Eugrn equation and calibrated by the published experimental leakage data. The numerical results show that the temperature is almost uniform through the bristle pack in the axial direction

and the radial temperature decreases exponentially in the fence height region. The temperature drop occurs mainly in the fence height region when the pressure difference is greater. The maximum temperature increases exponentially with the frictional heat generation. The leakage flow rate decreases and the maximum temperature increases with the increase in the bristle pack thickness. In addition

the maximum temperature increases with the rotational speed and the bristle interference.

关键词

Keywords

references

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Hendricks R C, Schlumberger S, Braun M J, et al. A bulk flow model of a brush seal system, ASME 91-GT-325 [R]. New York, USA: ASME, 1991.

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李军,晏鑫,丰镇平,等,基于多孔介质模型的刷式密封泄漏流动特性研究[J].西安交通大学学报, 2007, 41(7): 768-771,779.

LI Jun, YAN Xin, FENG Zhenping, et al. Study on the leakage flow characteristics of brush seal based on porous medium model[J]. Journal of Xi'an Jiaotong University, 2007, 41(7): 768-771,779.

CARLILE J A, HENDRICKS R C, YODER D A. Brush seal leakage performance with gaseous working fluids at static and low rotor speed conditions[J]. ASME Journal of Engineering for Gas Turbines and Power, 1993, 115(2): 397-403.

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HOLLE G F, CHUPP R E, DOWLER C A. Brush seal leakage correlations based on effective thickness[C]∥Proceedings of the 4th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery. Honolulu,USA: ISROMAC, 1992:296-304.

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