浮环密封结构弹性对间隙泄漏量和动力学系数的影响

推进技术 ›› 2017, Vol. 38 ›› Issue (12): 2815-2821.

浮环密封结构弹性对间隙泄漏量和动力学系数的影响

夏鹏,刘占生

哈尔滨工业大学能源科学与工程学院，黑龙江哈尔滨 150000,哈尔滨工业大学能源科学与工程学院，黑龙江哈尔滨 150000

发布日期:2021-08-15
作者简介:夏鹏，男，博士生，研究领域为动力机械间隙密封设计和轴系故障诊断。
基金资助:
国家自然科学基金(11176010)。

Effects of Structure Elasticity on Leakage and Rotordynamic Coefficients of Floating Ring Seals

School of Energy Science and Engineering，Harbin Institute of Technology，Harbin 150000，China and School of Energy Science and Engineering，Harbin Institute of Technology，Harbin 150000，China

Published:2021-08-15

摘要/Abstract

摘要： 为了研究高压条件下浮环密封结构弹性变形对间隙流体激励产生的影响，基于bulk flow模型、有限单元法和位移-位移耦合模式，建立密封间隙流体激励和浮环结构耦合模型。通过与文献和商业软件对比，验证耦合模型的正确性和计算方法的准确性。研究结果表明高压条件下浮环结构弹性导致密封间隙明显缩小，对心条件下，入口处弹性变形达到21.43%，泄漏量减小19.2%。同时，主刚度降低，交叉刚度相对增加，锁死偏心率越大，结构弹性的影响越明显，导致转子临界转速降低和振动响应增大。

关键词: 浮环密封；结构弹性；Bulk flow；泄漏量；动力学系数

Abstract: To study the effects of elastic deformation of floating ring seals on hydrodynamic forces under high pressure，a coupled model of flow field in the seal clearance and elastic structure of the floating ring is established，by making use of bulk flow model，finite element method and displacement-displacement coupled method. By comparison with reference and commercial software result，the coupled model and calculation procedure are proved to be accurate. The results show that structural elasticity of floating ring seals results in narrowing clearance height with 21.43% deformation at the seal entrance and leakage reducing 19.2%. Direct stiffness decreases and coupled stiffness increases relatively when structural elasticity is taken into consideration. With eccentricity ratio increasing，the effect of structural elasticity becomes much evident. Elastic deformation of floating ring seals results in the decrease of the critical speed of rotor decreases and the increase of vibration amplitude.

Key words: Floating ring seal；Structural elasticity；Bulk flow；Leakage；Rotordynamic coefficients

夏鹏,刘占生. 浮环密封结构弹性对间隙泄漏量和动力学系数的影响[J]. 推进技术, 2017, 38(12): 2815-2821.

XIA Peng ,LIU Zhan-sheng. Effects of Structure Elasticity on Leakage and Rotordynamic Coefficients of Floating Ring Seals[J]. Journal of Propulsion Technology, 2017, 38(12): 2815-2821.

参考文献

[1] Manoj K Gupta, Thomas A Soulas, Dara W Childs. New Steps to Improve Rotordynamic Stability Predictions of Centrifugal Compressors[J]. Journal of Engineering for Gas Turbines and Power, 2008, 130(2): 1-8.
[2] Allaire P E, Kocur Jr J A. Oil Seal Effects and Subsynchronous Vibrations in High-Speed Compressors[R]. NASA 1986-002-0704.
[3] Andres L S. Analysis of Multi-Land High Pressure Oil Seals[J]. Tribology Transactions, 1993, 36(4): 661-669.
[4] Baheti S K, Kirk R G. Thermo-Hydrodynamic Solution of Floating Ring Seals for High Pressure Compressors Using the Finite-Element Method[J]. Tribology Transactions, 1994, 37(2): 336-346.
[5] Baheti S K, Kirk R G. Finite Element Thermo-Hydrodynamic Analysis of a Circumferentially Grooved Floating Oil Ring Seal[J]. Tribology Transactions, 1995, 38(1): 86-96.
[6] Childs D W, Rodriguez L E, Cullotta V, et al. Rotordynamic-Coefficients and Static Characteristics for Short, Laminar-Flow Annular Seals[J]. Journal of Tribology, 2005, 128(2):378-387.
[7] Andres L S, Delgado A. A Novel Bulk-Flow Model for Improved Predictions of Force Coefficients in Grooved Oil Seals Operating Eccentrically[J]. Journal of Engineering for Gas Turbines and Power, 2012, 134(5): 1-10.
[8] Ha T-W, Lee Y-B, Kim C-H. Leakage and Rotordynamic Analysis of a High Pressure Floating Ring Seal in the Turbo Pump Unit of a Liquid Rocket Engine[J]. Tribology International, 2002, 35(3): 153-161.
[9] Lee Y B, Shin S K, Ryu K, et al. Test Results for Leakage and Rotordynamic Coefficients of Floating Ring Seals in a High-Pressure, High-Speed Turbopump[J]. Tribology Transactions, 2005, 48(3): 273-82.
[10] Duan W, Chu F, Kim C-H, et al. A Bulk-Flow Analysis of Static and Dynamic Characteristics of Floating Ring Seals[J]. Tribology International, 2007, 40(3): 470-478.
[11] Childs D W, Dressman J B. Convergent-Tapered Annular Seals: Analysis and Testing for Rotordynamic Coefficients[J]. Journal of Tribology, 1985, 107(3): 307-316.
[12] Lindsey W T, Childs D W. The Effects of Converging and Diverging Axial Taper on the Rotordynamic Coefficients of Liquid Annular Pressure Seals: Theory Versus Experiment[J]. Journal of Vibration and Acoustics, 2000, 122(2): 126-131.
[13] Baheti S K, Kirk R G. Analysis of High Pressure Liquid Seal Ring Distortion and Stability Using Finite Element Methods[J]. Journal of Tribology, 1999, 121(4).
[14] Kirk R G. Transient Response of Floating Ring Liquid Seals[J]. Journal of Tribology, 1988, 110(3): 572-577.
[15] Arghir M, Nguyen M-H, Tonon D, et al. Analytic Modeling of Floating Ring Annular Seals[J]. Journal of Engineering for Gas Turbines and Power, 2012, 134(5).
[16] Mariot A, Arghir M, Helies P, et al. Experimental Analysis of Floating Ring Annular Seals and Comparisons with Theoretical Predictions[J]. Journal of Engineering for Gas Turbines and Power, 2016, 138(4).
[17] Athavale M M, Robert C Hendricks, Bruce M Steinetz. Numerical Simulation of Flow in a Whirling Annular Seal and Comparison with Experiments[R]. NASA 1995-002-4289.
[18] 高庆, 李军. 涡轮蜂窝面径向轮缘密封封严性能的数值研究[J]. 推进技术, 2016, 37(5). (GAO Qing, LI Jun. Numerical Investigations on Sealing Performance of Turbine Honeycomb Radial Rim Seal[J]. Journal of Propulsion Technology, 2015, 37(5).)
[19] 李钰洁, 刘永葆, 贺星. 间隙变化对新型涡轮密封气动性能影响的数值分析[J]. 推进技术, 2015, 36(8). (LI Yu-jie, LIU Yong-bao, HE Xing. Numerical Simulation for Effects of Clearance Change of a Novel Seal on Aerodynamic Performance of Gas Turbine[J]. Journal of Propulsion Technology, 2015, 36(8).)
[20] Gocha Chochua, Thomas A Soulas. Numerical Modeling of Rotordynamic Coefficients for Deliberately Roughened Stator Gas Annular Seals[J]. Journal of Tribology, 2007, 129(2): 424-429.
[21] Xin Yan, Jun Li, Zhenping Feng. Investigations on the Rotordynamic Characteristics of a Hole-Pattern Seal Using Transient CFD and Periodic Circular Orbit Model[J]. Journal of Vibration and Acoustics, 2011, 133(4).
[22] Luis A, San Andres. Analysis of Variable Fluid Properties, Turbulent Annular Seals[J]. Journal of Tribology, 1991, 113(4): 694-702.
[23] 王勖成. 有限单元法[M]. 北京:清华大学出版社, 2003.
[24] 夏鹏, 王祥和, 刘占生, 等. CFD优化火箭涡轮泵间隙密封静动态特性计算模型[J]. 推进技术, 2017, 38(7). (XIA Peng, WANG Xiang-he, LIU Zhan-sheng, et al. CFD Optimized Calculation of Static and Dynamic Characteristics for Annular Seals in Rocket Turbo Pumps[J]. Journal of Propulsion Technology, 2017, 38(7).)(编辑:史亚红)　　　　　　　　　　　　　*　收稿日期:2016-07-23；修订日期:2016-10-08。基金项目:国家自然科学基金(11176010)。作者简介:夏鹏,男,博士生,研究领域为动力机械间隙密封设计和轴系故障诊断。E-mail: chandlergogo@163.com