Investigation on the Rotordynamic Characteristics of Straight-Through Labyrinth Seal Using Bulk-Flow Model

doi:10.7652/xjtuxb202105004

您当前的位置：

首页 >

文章列表页 >

Investigation on the Rotordynamic Characteristics of Straight-Through Labyrinth Seal Using Bulk-Flow Model

更新时间：2025-07-09

- Investigation on the Rotordynamic Characteristics of Straight-Through Labyrinth Seal Using Bulk-Flow Model
- Vol. 55, Issue 5, Pages: 25-33(2021)
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202105004
  CLC： TK262
- Online First：10 May 2021，
  
  Published：2021
- 稿件说明：
移动端阅览
Investigation on the Rotordynamic Characteristics of Straight-Through Labyrinth Seal Using Bulk-Flow Model[J]. 2021, 55(5): 25-33.
DOI：

Investigation on the Rotordynamic Characteristics of Straight-Through Labyrinth Seal Using Bulk-Flow Model[J]. 2021, 55(5): 25-33. DOI： 10.7652/xjtuxb202105004.

摘要

为了选择最佳泄漏模型并探究运行工况参数对直通式迷宫密封转子动力特性的影响规律

基于单控制体等熵过程Bulk-Flow模型发展了迷宫密封转子动力特性预测方法并开发了计算程序。通过对72种泄漏模型进行适用性分析

获得的最佳泄漏模型是采用Neumann泄漏方程、Chaplygin流量系数、Swamee & Jain切应力系数以及Kurohashi动能输运系数(正预旋工况)或Neumann动能输运系数(负预旋工况)的模型。所发展的方法结合这一模型对迷宫密封交叉刚度和直接阻尼的平均预测误差约为10%。研究了压比(0.3

0.5

0.7)和预旋比(-0.8

-0.4

0.4

0.8)对迷宫密封转子动力特性的影响

结果表明:迷宫密封交叉刚度和直接阻尼对密封进口压力敏感

而受出口压力的影响有限

穿越频率几乎不受进出口压力的影响; 迷宫密封有效阻尼随预旋比增大而减小

在正预旋时出现负值

且其穿越频率随预旋比增大而显著增大

不利于转子系统的稳定运行; 进口预旋速度的影响在密封上游腔室更为显著

应在迷宫密封进口采用防旋流装置来抑制泄漏流的周向流动。所发展的预测方法和计算程序可为迷宫密封转子动力特性系数的快速评估提供技术手段。

Abstract

To select the best leakage model and investigate the effects of the operational conditions on the rotordynamic characteristics of the straight-through labyrinth seal

the rotordynamic characteristics prediction method and program of labyrinth seals are developed based on the one-control-volume Bulk-Flow model considering the isentropic process. Through the applicability analysis of 72 leakage models

it is found that the best leakage model is the one that uses Neumann's leakage equation

Chaplygin's discharge coefficient

Swamee & Jain's friction factor and Kurohashi's kinetic energy carryover coefficient(for positive preswirl conditions)or Neumann's kinetic energy carryover coefficient(for negative preswirl conditions). The developed method combined with the best leakage model has an average prediction error of about 10% for the cross-coupled stiffness and direct damping of labyrinth seals. The developed prediction program is used to investigate the effects of pressure ratios(0.3

0.5

0.7)and preswirl ratios(-0.8

-0.4

0.4

0.8)on the rotordynamic characteristics of labyrinth seals. The results show that the cross-coupled stiffness and direct damping of labyrinth seals are sensitive to the inlet pressure

but are insensitive to the outlet pressure. The crossover frequency is hardly affected by the inlet and outlet pressures. Increasing preswirl ratio results in a decrease in the effective damping of labyrinth seals. For positive preswirl conditions

negative effective damping exists and the crossover frequency significantly increases with the preswirl ratio

which is a destabilizing factor for rotor system. The influence of inlet preswirl velocity is more significant at the upstream cavities of the seal. Therefore

anti-swirl devices should be installed at the seal entrance to suppress the circumferential flow of the leakage flow. The presented prediction method and program can provide technical approaches for rapid evaluation of the rotordynamic coefficients of labyrinth seals.

关键词

Keywords

references

CHUPP R E, HENDRICKS R C, LATTIME S B, et al. Sealing in turbomachinery [J]. Journal of Propulsion and Power, 2006, 22(2): 313-349.

IWATSUBO T. Evaluation of instability forces of labyrinth seals in turbines or compressors [C]∥Proceedings of Rotordynamic Instability Problems in High Performance Turbomachinery. College Station, TX, USA: NASA Lewis Research Center, 1980: 139-167.

LI Zhigang, LI Jun, YAN Xin. Multiple frequencies elliptical whirling orbit model and transient RANS solution approach to rotordynamic coefficients of annual gas seals prediction [J]. Journal of Vibration and Acoustics, 2013, 135(3): 031005.

CHILDS D W, SCHARRER J K. An Iwatsubo-based solution for labyrinth seals: comparison to experimental results [J]. Journal of Engineering for Gas Turbines and Power, 1986, 108(2): 325-331.

SCHARRER J K. Theory versus experiment for the rotordynamic coefficients of labyrinth gas seals: part I A two control volume model [J]. Journal of Vibration and Acoustics, 1988, 110(3): 270-280.

PICARDO A, CHILDS D W. Rotordynamic coefficients for a tooth-on-stator labyrinth seal at 70 bar supply pressures: measurements versus theory and comparisons to a hole-pattern stator seal [J]. Journal of Engineering for Gas Turbines and Power, 2005, 127(4): 843-855.

晏鑫, 李军, 丰镇平. Bulk Flow方法分析孔型密封转子动力特性的有效性 [J]. 西安交通大学学报, 2009, 43(1): 24-28.

YAN Xin, LI Jun, FENG Zhenping. Validation of two-control-volume bulk flow method for rotordynamic characteristics of hole-pattern seals [J]. Journal of Xi'an Jiaotong University, 2009, 43(1): 24-28.

袁振伟, 王海娟, 岳希明, 等. 密封进口涡动系数对转子系统动力学性能的影响 [J]. 工程力学, 2011, 28(11): 231-236.

YUAN Zhenwei, WANG Haijuan, YUE Ximing, et al. Influences of liquid-seal inlet swirl ratio on the dynamic properties of a rotor system [J]. Engineering Mechanics, 2011, 28(11): 231-236.

席文奎, 许吉敏, 张宏涛, 等. 迷宫密封对高参数转子系统稳定性的影响分析及公理设计方法应用 [J]. 中国电机工程学报, 2013, 33(5): 102-111.

XI Wenkui, XU Jimin, ZHANG Hongtao, et al. Investigation on influences of labyrinth seal on stability of high-parameter rotor system and application of axiomatic design method [J]. Proceedings of the CSEE, 2013, 33(5): 102-111.

CANGIOLI F, PENNACCHI P, VANNINI G, et al. Effect of energy equation in one control-volume bulk-flow model for the prediction of labyrinth seal dynamic coefficients [J]. Mechanical Systems and Signal Processing, 2018, 98: 594-612.

SHULTZ R R. Analytical and experimental investigations of a labyrinth seal test rig and damper seals for turbomachinery [D]. College Station, TX, USA: Texas AM University, 1997.

NEUMANN K. Zur frage der verwendung von durchblickdichtungen im dampfturbinenbau [J]. Maschinenbautechnik, 1964, 13(4): 188-195.

GAMAL ELDIN A M. Leakage and rotordynamic effects of pocket damper seals and see-through labyrinth seals [D]. College Station, TX, USA: Texas AM University, 2007.

DERELI Y. Comparison of rotordynamic coefficients for labyrinth seals using a two-control volume method [J]. Proceedings of the Institution of Mechanical Engineers: Part A Journal of Power and Energy, 2008, 222(1): 123-135.

VANNINI G, CIONCOLINI S, CALICCHIO V, et al. Development of a high pressure rotordynamic test rig for centrifugal compressors internal seals characterization [C]∥Proceedings of the 40th Turbomachinery Symposium. College Station, TX, USA: Texas AM University, 2011: 46-59.

VANNINI G, CIONCOLINI S, DEL VESCOVO G, et al. Labyrinth seal and pocket damper seal high pressure rotordynamic test data [J]. Journal of Engineering for Gas Turbines and Power, 2014, 136(2): 022501.

CHILDS D W. Turbomachinery rotordynamics: phenomena, modeling, and analysis [M]. New York, USA: John Wiley Sons, Inc., 1993.

王天昊, 李志刚, 李军. 基于Bulk-Flow模型的直通式迷宫密封泄漏特性预测模型适用性研究 [C]∥中国工程热物理学会热机气动热力学学术会议. 北京: 中国工程热物理学会, 2020: 202103.

晏鑫, 李军, 丰镇平. 预旋对蜂窝密封和迷宫密封内流动传热特性影响 [J]. 航空动力学报, 2009, 24(4): 772-776.

YAN Xin, LI Jun, FENG Zhenping. Influence of inlet preswirl on discharge and heat transfer characteristics of honeycomb and smooth labyrinth seals [J]. Journal of Aerospace Power, 2009, 24(4): 772-776.

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Fluid Excited Rotordynamic Characteristics of Labyrinth Seal During Non-Uniform Inlet Flowing

Investigations on the Leakage Characteristics and Rotordynamic Coefficients of Labyrinth Seal with Tooth Bending Damage

Rotordynamic Characteristics of Labyrinth Seals with Integrated Design of Swirl Brake and Shaft Configuration

Investigation on the Rotordynamic Characteristics of Labyrinth Seal with Swirl Brakes

Experimental Research on Rotordynamic Characteristics of Labyrinth Seals at High Inlet Preswirl

Related Author

陈尧兴 1

李军 1

李志刚 1

晏鑫 1

LI Jun

LI Zhigang

Related Institution

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

Institute of Turbomachinery, Xi'an Jiaotong University

(Institute of Turbomachinery, Xi'an Jiaotong University,,)

Shenyang Blower Works Group Corporation

Nanjing Electric Power Experimental Research Co., Ltd.

⁰