干气密封螺旋槽内润滑气膜的热力过程

doi:10.3969/j.issn.1674-8530.2012.04.016

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (2094 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要基于滑移边界条件下的雷诺方程,不考虑密封环的变形,通过PH线性化方法、迭代法求解获得了气膜压力函数式．根据气膜微尺度流体流动过程中的熵变方程,得到了螺旋槽内气膜温度场分布．考虑微槽道内气流在不同阶段的熵变过程,分析了气膜温度场在不同多变指数下的分布规律,进而在不同多变指数下计算出密封环的热弹变形量及气膜厚度近似表达式,利用广义雷诺方程求解热弹变形下的气膜压力分布．在不同多变指数下对泄漏量进行计算并与无变形时的理论泄漏量进行比对．结果表明:随着气体从外径流入内径,槽内温度先升高后降低,密封环的变形量先增大后减小,泄漏量随变形量增大而变大,从而对密封性能产生影响．试验验证了泄漏量在采用不同多变指数时更接近于实际工况．这为螺旋槽干气密封的优化设计奠定了理论基础．

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	韩明君
	李有堂
	苏虹
	丁雪兴
	俞树荣

关键词 ：热力过程, 螺旋槽, 熵变方程, 多变指数, 热弹变形

Abstract：An analytical pressure distribution function in the gas film is obtained by using the PH linearization and an iterative method without considering deformation of the seal rings based on the Reynolds equation under the sliding boundary conditions. From the equation relating to entropy change of microfluid flow in the spiral grooves, the temperature field in the gas film was obtained. The temperature distribution in the gas film under the different polytropic exponents was analyzed by considering the process of entropy change of the fluid in the spiral groove. The thermoelastic deformation of the seal rings and an approximate analytical formula for the gas film thickness were obtained for different polytropic exponent, the pressure distribution for the thermoelastic deformation was worked out as well based on the generalized Reynolds equation. The leakage through the seals was predicted and compared with the theoretical one without deformation for different polytropic exponents. The results demonstrated that the highest temperature in the film appears inside the seals as a fluid flows inwards and the most significant deformation occurs there. The leakage was increased with deformation, eventually affecting the sealing performance. The leakages under different polytropic exponents were much closer to the experimental measurements. The results can be used as a theoretical basis for optimization design of dry gas seals.

Key words： thermal process spiral groove entropy variation equation polytropic exponent thermoelastic deformation

收稿日期: 2011-12-07 出版日期: 2012-07-30

基金资助:

国家自然科学基金资助项目（51165020）

通讯作者: 韩明君（1975—），男，甘肃会宁人，讲师，博士研究生(hanmj5188@163.com)，主要从事流体动密封研究.

作者简介: 李有堂（1963—），男，甘肃定西人，教授，博士生导师(liyt@lut.cn),主要从事裂纹加工理论与应用、抗疲劳设计理论与应用、产品创新设计等研究.

引用本文:

韩明君, 李有堂, 苏虹, 丁雪兴, 俞树荣. 干气密封螺旋槽内润滑气膜的热力过程[J]. 排灌机械工程学报, 2012, 30(4): 457-462. Han-Ming-Jun, LI You-Tang, SU Hong, DING Xue-Xing, YU Shu-Rong. Thermodynamic process of lubricating gas film in dry gas seals with spiral grooves. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(4): 457-462.

链接本文:

http://zzs.ujs.edu.cn/pgjx/CN/10.3969/j.issn.1674-8530.2012.04.016 或 http://zzs.ujs.edu.cn/pgjx/CN/Y2012/V30/I4/457

［1］Ezquerra Larrodé F, Housiadas Christos, Drossinos Yannis. Slipflow heat transfer in circular tubes［J］. International Journal of Heat and Mass Transfer, 2000,43(15):2669-2680.

［2］GadelHak Mohamed. The fluid mechanics of microdevices—The freeman scholar lecture［J］. Journal of Fluids Engineering, Transactions of the ASME, 1999,121(1):5-33.

［3］Kassner M E, NematNasser Sia, Suo Zhigang, et al. New directions in mechanics［J］. Mechanics of Materials, 2005,37(2／3):231-259.

［4］Hakak Khadem M, Shams M, Hossainpour S. Effects of rarefaction and compressibility on fluid flow at slip flow regime by direct simulation of roughness［J］. World Academy of Science, Engineering and Technology, 2008,41:231-237.

［5］李娜, 朱维兵, 王和顺,等. T型槽干气密封动环稳态温度分布规律研究［J］. 液压与气动, 2009(5): 46-49.

Li Na,Zhu Weibing,Wang Heshun, et a1. Research on distribution law of steadystate temperature for the rotating ring of Tshape groove dry gas seal［J］. Chinese Hydraulics ＆ Pneumatics, 2009(5):46-49.(in Chinese)

［6］Pecht G G, Netzel J P. Design and application of noncontacting gas lubricated seals for slow speed services［J］. Lubrication Engineering, 1999,55(7):20-25.

［7］Ruan Bo. Finite element analysis of the spiral groove gas face seal at the slow speed and the low pressure conditions—Slip flow consideration［J］. Tribology Transactions, 2000,43(3):411-418.

［8］尹晓妮,彭旭东.考虑滑移流条件下干式气体端面密封的有限元分析［J］.润滑与密封,2006(4):55-57.

Yin Xiaoni, Peng Xudong. Finite element analysis of a dry gas seal under slip flow conditions［J］. Lubrication Engineering, 2006(4):55-57.(in Chinese)

［9］肖睿,辛明道,朱恂.微矩形槽道内的气体滑移流动和传热分析［J］.重庆大学学报:自然科学版, 2001,24(1):99-103.

Xiao Rui, Xin Mingdao, Zhu Xun. Analysis of gaseous slip flow and heat transfer in micro rectangular channels［J］. Journal of Chongqing University: Natural Science Edition, 2001,24(1):99-103.(in Chinese)

［10］肖睿,辛明道.边界条件对滑移区气体微槽流动和传热的影响［J］.西安交通大学学报, 2001,35(10):1067-1071.

Xiao Rui, Xin Mingdao. Boundary condition effects on gaseous slip flow and heat transfer in micro rectangular channels［J］. Journal of Xi′an Jiaotong University, 2001,35(10):1067-1071.(in Chinese)

［11］丁雪兴,陈德林,张伟政, 等. 螺旋槽干气密封微尺度流动场的近似计算及其参数优化［J］. 应用力学学报,2007,24(3):425-428.

Ding Xuexing, Chen Delin, Zhang Weizheng, et a1. Approximate calculation and parameters optimization for microscale flow field in spiral grooved gas seals［J］. Chinese Journal of Applied Mechanics, 2007, 24 (3):425-428.(in Chinese)

［12］Offermann S, Beaudoin J L, Bissieux C, et al. Thermoelastic stress analysis under nonadiabatic conditions［J］. Experimental Mechanics, 1997,37(4):409-413.

［13］黄健萌,高诚辉. 粗糙面变形特性对摩擦温度与接触压力的影响［J］. 农业机械学报, 2012, 43(4): 202-207.

Huang Jianmeng, Gao Chenghui. Influence of deformation characteristic of rough surface on frictional temperature and contact pressure［J］. Transactions of the Chinese Society for Agricultural Machinery, 2012, 43(4):202-207.(in Chinese)

［14］童钧耕.工程热力学［M］. 4版. 北京:高等教育出版社,2007.

［15］顾永泉. 机械密封实用技术［M］. 北京:机械工业出版社,2007.