基于多孔介质局部非热平衡方法的刷式密封耦合传热特性

邱波; 李军

doi:10.13224/j.cnki.jasp.2015.05.006

基于多孔介质局部非热平衡方法的刷式密封耦合传热特性

doi: 10.13224/j.cnki.jasp.2015.05.006

邱波,
李军

西安交通大学能源与动力工程学院, 西安 710049

基金项目:

国家自然科学基金(50976083)

详细信息

作者简介:
邱波(1987-),男,新疆哈密人,博士生,主要从事叶轮机械密封的研究.

中图分类号: V233.5
计量
- 文章访问数: 1562
- HTML浏览量: 2
- PDF量: 799
- 被引次数: 0
出版历程
- 收稿日期: 2013-12-15
- 刊出日期: 2015-05-28

Conjugate heat transfer characteristics of brush seal based on local thermal non-equilibrium porous medium approach

QIU Bo,
LI Jun

School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China

摘要

摘要: 建立了刷式密封流动传热与摩擦接触的多物理场耦合分析的计算模型.推导了描述刷式密封在局部非热平衡条件下耦合传热过程的双能量方程,该方程既考虑了刷丝与气流的对流换热,同时也考虑了刷丝束内导热过程的各向异性.采用所建立的耦合计算模型数值预测了刷式密封在不同压比和转速下的温度分布.结果表明:刷式密封的摩擦热效应使刷丝与转子相接触的附近区域形成局部高温,刷丝的高温区域主要集中在围栏高度以下;泄漏气流与刷丝间强烈的对流换热使刷丝的温度分布和气流的温度分布非常相近;刷丝的最高温度随压比增大而升高,但围栏高度以下区域的平均温度随压比增大而降低;刷丝的最高温度和围栏高度以下区域的平均温度均随转速升高而升高;摩擦热效应引起的泄漏气流的温升效应使刷式密封泄漏量随转速升高而减小.
- 刷式密封 /
- 摩擦热效应 /
- 多孔介质 /
- 局部非热平衡 /
- 耦合传热
Abstract: Computational model was developed for multi-physics coupling simulation of the flowing, heat transfer, frictional contact of the brush seal. A dual-energy equation was proposed to describe the conjugate heat transfer in the brush seal under local thermal non-equilibrium condition. Both the heat convection between the bristle and airflow and the anisotropy of heat conduction in the bristle pack were considered in the dual-energy equation. The temperature distributions of brush seal were numerically predicted using the developed computational model at various pressure ratios and rotational speeds. Results show that a local high temperature region is formed around the bristle-rotor contact area due to frictional heat effect of brush seal. The high temperature region of bristles is mainly located under fence height. The temperature distribution of airflow is similar to that of bristles due to strong heat convection between leakage airflow and bristles. The maximum temperature of bristles increases with the increasing pressure ratio. The average temperature under fence height region of bristles decreases with the increasing pressure ratio. The maximum temperature and average temperature under fence height region of bristles increase with the increasing rotational speed. The temperature rise effect of leakage airflow arising from frictional heat effect makes the leakage rate of brush seal decrease with the increasing rotational speed.
- brush seal /
- frictional heat effect /
- porous medium /
- local thermal non-equilibrium /
- conjugate heat transfer

HTML

参考文献(18)

[1]	LI Jun, QIU Bo, FENG Zhenping.Experimental and numerical investigations on the leakage flow characteristics of the labyrinth brush seal[J].Journal of Engineering for Gas Turbines and Power, 2012, 134(10):102509.1-102509.9.
[2]	Owen A K, Jones T V, Guo S M, et al.An experimental and theoretical study of brush seal and shaft thermal interaction[R].ASME Paper GT-2003-38276, 2003.
[3]	Chew J W, Guardino C.Simulation of flow and heat transfer in the tip region of a brush seal[J].International Journal of Heat Fluid Flow, 2004, 25(4):649-658.
[4]	Demiroglu M, Tichy J A.An investigation of heat generation characteristics of brush seals[R].ASME Paper GT2007-28043, 2007.
[5]	Dogu Y, Aksit M F.Brush seal temperature distribution analysis[J].Journal of Engineering for Gas Turbines and Power, 2006, 128(3):599-609.
[6]	Pekris M J, Franceschini G, Gillespie D R H.Effect of geometric changes in an idealised contacting brush seal bristle pack on typical key performance measures[R].ASME Paper GT2011-46492, 2011.
[7]	丁水汀, 陶智, 徐国强.刷式封严流动和换热的数值模拟[J].推进技术, 1999, 20(1):65-67. DING Shuiting, TAO Zhi, XU Guoqiang.Numerical simulation on fluid flow and heat transfer of a brush seal configuration[J].Journal of Propulsion Technology, 1999, 20(1):65-67.(in Chinese)
[8]	黄学民, 史伟, 王洪铭.刷式密封中泄漏流动的多孔介质数值模型[J].航空动力学报, 2000, 15(1):55-58. HUANG Xuemin, SHI Wei, WANG Hongming.Porous medium leakage flow model of brush seal[J].Journal of Aerospace Power, 2000, 15(1):55-58.(in Chinese)
[9]	曹广州, 吉洪湖, 袁艳平.模拟刷式封严泄漏流动的多孔介质模型[J].航空动力学报, 2008, 23(3):443-447. CAO Guangzhou, JI Honghu, YUAN Yanping.A porous medium model for simulating leakage flows through brush seals[J].Journal of Aerospace Power, 2008, 23(3):443-447.(in Chinese)
[10]	李理科, 王之栎, 宋飞, 等.刷式密封温度场数值研究[J].航空动力学报, 2010, 25(5):1018-1024. LI Like, WANG Zhili, SONG Fei, et al.Numerical investigation of temperature field in brush seals[J].Journal of Aerospace Power, 2010, 25(5):1018-1024.(in Chinese)
[11]	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. QIU Bo, LI Jun.Investigation on the heat transfer characteristics of brush seals[J].Journal of Xi'an Jiaotong University, 2010, 45(9):94-100.(in Chinese)
[12]	邱波, 李军, 陈春新, 等.基于CFD和FEM方法的刷式密封传热特性研究[J].工程热物理学报, 2012, 33(12):2067-2071. QIU Bo, LI Jun, CHEN Chunxin, et al.Investigations on the heat transfer characteristics of brush seals based on computational fluid dynamics and finite element analysis[J].Journal of Engineering Thermophysics, 2012, 33(12):2067-2071.(in Chinese)
[13]	邱波, 李军, 丰镇平.考虑刷丝变形的刷式密封摩擦热效应研究[J].工程热物理学报, 2013, 34(11):1-5. QIU Bo, LI Jun, FENG Zhenping.Investigations on frictional heat generation of brush seals with consideration of bristle deflections[J].Journal of Engineering Thermophysics, 2013, 34(11):1-5.(in Chinese)
[14]	QIU Bo, LI Jun.Numerical investigations on the heat transfer behavior of brush seals using combined computational fluid dynamics and finite element method[J].Journal of Heat Transfer, 2013, 135(12):122601.1-122601.10.
[15]	刘伟, 范爱武, 黄晓明.多孔介质传热传质理论与应用[M].北京:科学出版社, 2006.
[16]	Ergun S.Fluid flow through packed columns[J].Chemical Engineering Progress, 1952, 48:89-94.
[17]	Bergman T L, Lavine A S, Incropera F P, et al.Introduction to heat transfer[M].6th ed.Hoboken, US:John Wiley & Sons, 2011.
[18]	Bayley F J, Long C A.A combined experimental and theoretical study of flow and pressure distributions in a brush seal[J].Journal of Engineering for Gas Turbines and Power, 1993, 115(2):404-410.