水蒸汽参数对密封动静特性的影响

何文强; 郑志豪; 张万福

doi:10.3969/j.issn.1673-3185.2017.05.016

水蒸汽参数对密封动静特性的影响

doi: 10.3969/j.issn.1673-3185.2017.05.016

1.
中国舰船研究设计中心, 上海 201108
2.
上海理工大学能源与动力工程学院, 上海 200093

基金项目:

国家自然科学基金青年科学基金资助项目 11402148

详细信息

作者简介:
郑志豪, 女, 1990年生, 硕士, 助理工程师

张万福, 男, 1986年生, 博士, 讲师

通信作者:
何文强(通信作者), 男, 1990年生, 硕士, 助理工程师

中图分类号: U664.1
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- 文章访问数: 249
- HTML全文浏览量: 64
- PDF下载量: 122
- 被引次数: 0
出版历程
- 收稿日期: 2017-02-13
- 网络出版日期: 2017-09-26
- 刊出日期: 2017-10-01

Influence of steam parameters on static and dynamic characteristics of labyrinth seal

1.
Shanghai Division, China Ship Development and Design Center, Shanghai 201108, China
2.
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

水蒸汽参数对密封动静特性的影响由何文强，等创作，采用知识共享署名4.0国际许可协议进行许可。

摘要

摘要: 目的为了研究工质参数对透平机械中密封动静特性的影响，方法建立梳齿密封三维数值模型，分别以空气和水蒸汽为工质，应用计算流体力学（CFD）方法和旋转坐标系方法分析不同水蒸汽参数对密封泄漏性能和动力特性系数的影响。结果结果表明：工质为空气和水蒸汽时，密封的泄漏特性区别很大，其流体激振力与涡动速度分别呈线性和二次非线性的变化关系。当水蒸汽温度增加时，密封动力特性系数的变化将导致系统的稳定性下降。结论因此工质参数对透平机械的系统稳定性具有重要意义，在实际应用中需要考虑工质参数对密封动静特性及转子系统的影响。
- 密封 /
- 水蒸汽 /
- 泄漏量 /
- 计算流体力学 /
- 动力特性系数
Abstract: Objectives In order to study the influence of working medium parameters on the static and dynamic characteristics of seals in turbomachinery, Methods a three-dimensional model of a labyrinth seal was created, and air and steam were applied in the numerical simulation. The Computational Fluid Dynamics (CFD) method and a rotating frame were applied to analyze the influence of different steam parameters on the leakage characteristics and dynamic characteristic coefficients. Results The results show that great differences in leakage flow rate are apparent under different air and steam conditions, and the fluid-induced force shows linear and nonlinear variation with the increasing whirl speed. When the steam temperature increases, the system stability decreases as the dynamic characteristic coefficients change. Conclusions In consequence, working medium parameters are of great significance for turbine stability, and the influence of working medium parameters on the static and dynamic characteristics of seals should be given great attention in practical application.
- seal /
- steam /
- leakage flowrate /
- Computational Fluid Dynamics (CFD) /
- dynamic characteristic coefficient

HTML全文

图 1 梳齿密封二维模型

Figure 1. Two-dimensional model of the labyrinth seal

下载: 全尺寸图片幻灯片

图 2 旋转坐标系

Figure 2. Rotating frame

下载: 全尺寸图片幻灯片

图 3 气流力随涡动速度的变化（T=366.7 K，空气）

Figure 3. Fluid induced force versus whirl speed(T=366.7 K, Air)

下载: 全尺寸图片幻灯片

图 4 气流力随涡动速度的变化（T=366.7 K，水蒸汽）

Figure 4. Fluid induced force versus whirl speed (T=366.7 K, steam)

下载: 全尺寸图片幻灯片

图 5 密封入口温度对动力特性系数的影响

Figure 5. Influence of seal inlet temperature on the dynamic characteristic coefficients

下载: 全尺寸图片幻灯片

图 6 密封入口温度对泄漏特性的影响（水蒸汽）

Figure 6. Influence of seal inlet temperature on the leakage characteristics(steam)

下载: 全尺寸图片幻灯片

表 1 CFD仿真模型的参数

Table 1. Parameters of CFD simulation model

参数	仿真值
转子转速/（r·min^-1）	11 097
入口压力/MPa	3.447
入口温度T/K	366.7, 523, 549, 575, 601
出口压力/MPa	1.724
工质	空气（理想气体）、水蒸汽

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表 2 密封泄漏量对比

Table 2. Comparison of seal leakage flowrate

工质	文献[19]仿真值	本文仿真值
空气	1.08	1.094
水蒸汽	-	6.54

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表 3 动力特性系数对比

Table 3. Comparison of dynamic characteristic coefficients

动力特性系数	文献[19]仿真值	本文仿真值
动力特性系数	空气	空气	水蒸汽
K /（N·m^-1）	1.88×10⁶	4.59×10⁶	3.55×10⁶
k /（N·m^-1）	-7.20×10⁵	-8.19×10⁵	-3.93×10⁵
C /（N·s·m^-1）	1.6×10³	1.56×10³	1.39×10⁴
c /（N·s·m^-1）	1.24×10³	1.27×10³	1.97×10⁴
M / kg	-	-0.438	15.78
m / kg	-	-0.653	-11.89

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表 4 不同水蒸汽温度的密封泄漏特性

Table 4. Seal leakage characteristics under different steam temperatures

温度T/K	泄漏量/（kg·s^-1）	比容/（m³·kg^-1）	运动粘度/（m²·s^-1）
366.7	6.54	1.037×10^-3	3.137×10^-7
418	6.52	1.083×10^-3	2.058×10^-7
444	6.49	1.114×10^-3	1.773×10^-7
470	6.43	1.150×10^-3	1.575×10^-7
496	6.36	1.194×10^-3	1.434×10^-7
523	6.23	5.985 9×10^-2	1.052 9×10^-6
549	6.11	6.519×10^-2	1.227×10^-6
575	5.89	6.998 2×10^-2	1.401 2×10^-6
601	5.44	7.445 6×10^-2	1.578 5×10^-6

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参考文献(21)

[1]	杨建, 牛茂升, 郭栋, 等.某超超临界汽轮机高压进汽腔整圈斜置静叶的数值仿真[J].中国舰船研究, 2016, 11(3):97-101. http://www.ship-research.com/CN/abstract/abstract1565.shtml YANG J, NIU M S, GUO D, et al. Numerical simula-tion of skew stators with inlet chamber of ultra super-critical steam turbines[J]. Chinese Journal of Ship Re-search, 2016, 11(3):97-101(in Chinese). http://www.ship-research.com/CN/abstract/abstract1565.shtml
[2]	何国安, 赵利军, 任纬, 等. 1000 MW汽轮机汽流激振的故障分析及处理[J].中国电力, 2014, 47(4):27-31. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDL201404007.htm HE G A, ZHAO L J, REN W, et al. Analyzing and troubleshooting the steam-flow exciting vibration fault for 1000 MW unit[J]. Electric Power, 2014, 47(4):27-31(in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-ZGDL201404007.htm
[3]	史进渊, 孙庆, 危奇, 等.超超临界汽轮机汽流激振的研究[J].动力工程, 2003, 23(5):2620-2623. http://cdmd.cnki.com.cn/Article/CDMD-10286-1016329173.htm SHI J Y, SUN Q, WEI Q, et al. Research on the steam-excited vibration of ultra supercritical steam tur-bines[J]. Power Engineering, 2003, 23(5):2620-2623(in Chinese). http://cdmd.cnki.com.cn/Article/CDMD-10286-1016329173.htm
[4]	荆建平, 孟光, 赵玫, 等.超超临界汽轮机汽流激振研究现状与展望[J].汽轮机技术, 2004, 46(6):405-407, 410. http://www.cnki.com.cn/Article/CJFDTOTAL-QLJV200406002.htm JING J P, MENG G, ZHAO M, et al. Survey and out-look on the research of the steam excitation of superior ultra-critical steam turbine[J]. Turbine Technology, 2004, 46(6):405-407, 410(in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-QLJV200406002.htm
[5]	骆名文. 大型透平机械叶轮偏心引起的叶顶间隙气流激振研究[D]. 武汉: 华中科技大学, 2007. http://cdmd.cnki.com.cn/Article/CDMD-10487-2009036773.htm
[6]	李志刚, 李军, 丰镇平.迷宫密封泄漏特性影响因素的研究[J].西安交通大学学报, 2010, 44(3):16-20. doi: 10.7652/xjtuxb201003004 LI Z G, LI J, FENG Z P. Effects of gap pressure ratio and rotational speed on discharge behavior of labyrinth seal[J]. Journal of Xi'an Jiaotong University, 2010, 44(3):16-20(in Chinese). doi: 10.7652/xjtuxb201003004
[7]	丁学俊, 杨彦磊, 冯慧雯, 等.迷宫密封齿角对动力特性系数的影响[J].流体机械, 2005, 33(4):16-19, 30. http://www.cnki.com.cn/Article/CJFDTOTAL-LTJX200504004.htm DING X J, YANG Y L, FENG H W, et al. Influence of angle of the labyrinth seal teeth on the rotor dynamic characteristics[J]. Fluid Machinery, 2005, 33(4):16-19, 30(in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-LTJX200504004.htm
[8]	沈庆根, 郑水英, 朱祖超, 等.透平压缩机械一种消振型迷宫密封的研究[J].流体机械, 1997, 25(1):3-7. http://www.cnki.com.cn/Article/CJFDTOTAL-LTJX199701000.htm
[9]	LELLI D, CHEW J W, COOPER P. Combined threedimensional fluid dynamics and mechanical modeling of brush seals[J]. Journal of Turbomachinery, 2006, 128(1):188-195. doi: 10.1115/1.2103093
[10]	苏华. 指尖密封结构和性能的设计分析与试验研究[D]. 西安: 西北工业大学, 2006. http://cdmd.cnki.com.cn/Article/CDMD-10699-2007214226.htm
[11]	YÜCEL U. Calculation of leakage and dynamic coeffi-cients of stepped labyrinth gas seals[J]. Applied Mathematics and Computation, 2004, 152(2):521-533. doi: 10.1016/S0096-3003(03)00574-5
[12]	CHILDS D W, GANSLE A J. Experimental leakage and rotor dynamic results for helically grooved annu-lar gas seals[J]. Journal of Engineering for Gas Tur-bines and Power, 1996, 118(2):389-393. doi: 10.1115/1.2816601
[13]	张强, 何立东.蜂窝密封动力特性系数的计算方法[J].中国电机工程学报, 2007, 27(11):98-102. doi: 10.3321/j.issn:0258-8013.2007.11.019 ZHANG Q, HE L D. Study on calculation of the dy-namic coefficients of honeycomb seals[J]. Proceed-ings of the CSEE, 2007, 27(11):98-102(in Chi-nese). doi: 10.3321/j.issn:0258-8013.2007.11.019
[14]	何立东, 袁新, 尹新.蜂窝密封减振机理的实验研究[J].中国电机工程学报, 2001, 21(10):24-27. doi: 10.3321/j.issn:0258-8013.2001.10.006 HE L D, YUAN X, YIN X. Experimental invertiga-tion on the suppression mechanism for honeycomb seals[J]. Proceedings of the CSEE, 2001, 21(10):24-27(in Chinese). doi: 10.3321/j.issn:0258-8013.2001.10.006
[15]	李志刚, 李军, 丰镇平.蜂窝密封流动特性的数值研究和泄漏量计算公式的构造[J].机械工程学报, 2011, 47(2):142-148. http://www.cnki.com.cn/Article/CJFDTOTAL-JXXB201102023.htm LI Z G, LI J, FENG Z P. Numerical investigation on discharge behavior and predication formula establish-ment of leakage flow rate of honeycomb seal[J]. Jour-nal of Mechanical Engineering, 2011, 47(2):142-148(in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-JXXB201102023.htm
[16]	ERTAS B, GAMAL A, VANCE J. Rotor dynamic force coefficients of pocket damper seals[J]. Journal of Turbomachinery, 2006, 128(4):725-737. doi: 10.1115/1.2221327
[17]	PUGACHEV A O, DECKNER M. CFD prediction and test results of stiffness and damping coefficients for brush-labyrinth gas seals[R]. Glasgow, UK:ASME, 2010:175-185.
[18]	LAOS H E, VANCE J M, BUCHANAN S E, et al. Hybrid brush pocket damper seals for turbomachinery[J]. Journal of Engineering for Gas Turbines and Pow-er, 2000, 122(2):330-336. doi: 10.1115/1.483211
[19]	HIRANO T, GUO Z L, KIRK R G. Application of computational fluid dynamics analysis for rotating ma-chinery, Part 2:labyrinth seal analysis[J]. Journal of Engineering for Gas Turbines and Power, 2005, 127(4):820-826. doi: 10.1115/1.1808426
[20]	ATHAVALE M M, HENDRICKS R C. A small per-turbation CFD method for calculation of seal rotor dy-namic coefficients[J]. International Journal of Rotat-ing Machinery, 1996, 2(3):167-177. doi: 10.1155/S1023621X96000048
[21]	VENKATESAN G. CFD determination of flow pertur-bation boundary conditions for seal rotor dynamic modeling[D]. Texas:Texas A & M University, 2002.