| Citation: | SU Guozheng, SUN Dan, LI Yu, et al. Mechanism of influence of eccentricity on aeroelastic stability of labyrinth seal ring[J]. Journal of Aerospace Power, 2025, 40（5）：20220916 doi: 10.13224/j.cnki.jasp.20220916
|
In view of the aeroelastic stability problem of the labyrinth seal ring under eccentric whirling state of the aeroengine, the rotating coordinate system, three-dimensional interpolation and unsteady dynamic mesh technology were used to establish a solution model for the aeroelastic stability of the labyrinth seal ring based on the energy method, taking into account the factors of eccentric whirling and modal shape of the labyrinth seal ring. On the basis of verifying the accuracy of the solution model, the aeroelastic stability of the labyrinth seal ring under the eccentric condition was studied. The influence law of whirling frequency, precession form and mode shape on the aeroelastic stability of labyrinth seal ring was analyzed. The distribution characteristics of the aerodynamic work of labyrinth seal ring in different regions of the tooth cavities were analyzed, and the influence mechanism of eccentricity on the aeroelastic stability of labyrinth seal ring was revealed. The results showed that the aerodynamic damping ratio of labyrinth seal ring with low nodal diameter was more susceptible to eccentric whirling than that of other nodal diameters. The aerodynamic damping ratio of the first nodal diameter gradually decreased with the increase of eccentricity and changed from positive to negative value, leading to aerodynamic instability. Compared with the forward precession, the backward precession had larger aerodynamic damping ratio. Under stable state, the aerodynamic damping ratio increased with the increase of the whirling frequency. The aerodynamic work of the labyrinth seal ring presented waveform attenuation and oscillation distribution along the axial direction, and the amplitude of oscillation decayed step by step along the direction of the air flow. The aerodynamic work of the low pressure side of the labyrinth seal ring under stable state changed from negative work to positive work. The increase of eccentricity led to gradual increase of aerodynamic work in each axial region of the labyrinth seal ring, resulting in the change of the total aerodynamic work from negative to positive, resulting in instability. The increase of eccentricity did not change the contribution rate of aerodynamic work in each region to the total work.
| [1] |
周敏,孙丹,赵欢,等. 基于流固热耦合的非金属迷宫密封泄漏特性与公式构造[J]. 航空动力学报,2021,36(8): 1783-1792. ZHOU Min,SUN Dan,ZHAO Huan,et al. Leakage characteristics and formula establishment of nonmetallic labyrinth seal based on fluid-solid-thermal coupling[J]. Journal of Aerospace Power,2021,36(8): 1783-1792. (in Chinese
ZHOU Min, SUN Dan, ZHAO Huan, et al. Leakage characteristics and formula establishment of nonmetallic labyrinth seal based on fluid-solid-thermal coupling[J]. Journal of Aerospace Power, 2021, 36(8): 1783-1792. (in Chinese)
|
| [2] |
张万福,杨建刚,曹浩,等. 偏心密封内切向气流力及其对稳定性影响的理论与试验研究[J]. 机械工程学报,2011,47(17): 92-98. ZHANG Wanfu,YANG Jiangang,CAO Hao,et al. Theoretical and experimental research of tangential fluid-induced force and its influence on stability in eccentric seal[J]. Journal of Mechanical Engineering,2011,47(17): 92-98. (in Chinese doi: 10.3901/JME.2011.17.092
ZHANG Wanfu, YANG Jiangang, CAO Hao, et al. Theoretical and experimental research of tangential fluid-induced force and its influence on stability in eccentric seal[J]. Journal of Mechanical Engineering, 2011, 47(17): 92-98. (in Chinese) doi: 10.3901/JME.2011.17.092
|
| [3] |
LEWIS D A,PLATT C E,SMITH E B. Aeroelastic instability in FlOO labyrinth air seals[J]. Journal of Aircraft,1979,16(7): 484-490. doi: 10.2514/3.58552
|
| [4] |
陈桂彬,邹丛青,杨超. 气动弹性设计基础[M]. 北京: 北京航空航天大学出版社,2004. CHEN Guibin,ZOU Congqing,YANG Chao. Aeroelastic design foundation[M]. Beijing: Beijing University of Aeronautics & Astronautics Press,2004. (in Chinese
CHEN Guibin, ZOU Congqing, YANG Chao. Aeroelastic design foundation[M]. Beijing: Beijing University of Aeronautics & Astronautics Press, 2004. (in Chinese)
|
| [5] |
《航空发动机设计手册》总编委会. 航空发动机设计手册:第18册 叶片轮盘及主轴强度设计[M]. 北京: 航空工业出版社,2001.
|
| [6] |
WANG Nengmao,WANG Yanrong,TIAN Aimei. Influence of structure parameters on aeroelastic stability for labyrinth seal based on energy method[J]. Propulsion and Power Research,2018,7(4): 288-295. doi: 10.1016/j.jppr.2018.11.002
|
| [7] |
PHIBEL R,DI MARE L,GREEN J S,et al. Numerical investigation of labyrinth seal aeroelastic stability[C]// Proceedings of The ASME Turbo Expo 200. Orlando,US: ASME: 573-583.
|
| [8] |
RICHARD P. A numerical investigation of labyrinth seal flutter[D]. London,UK: Imperial College London,2012.
|
| [9] |
CORRAL R,VEGA A. Conceptual flutter analysis of labyrinth seals using analytical models: Part Ⅰ theoretical support[J]. Journal of Turbomachinery-Transactions of the ASME,2018,140(12): 121006.1-121006.11.
|
| [10] |
VEGA A,CORRAL R. Conceptual flutter analysis of labyrinth seals using analytical models: Part Ⅱ physical interpretation[C]//Proceedings of ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition,2018
|
| [11] |
ZHUANG Q Y. Parametric study on the aeroelastic stability of rotor seals[D]. Stockholm: Turbomachinery Aeromechanical University,2012.
|
| [12] |
MIURA T,SAKAI N. Numerical and experimental studies of labyrinth seal aeroelastic instability[J]. Journal of Engineering for Gas Turbines and Power,2019,141(11): 111005.1-111005.9.
|
| [13] |
王能茂,王延荣,田爱梅. 篦齿封严结构气弹稳定性数值分析[J]. 航空动力学报,2018,33(5): 1144-1150. WANG Nengmao,WANG Yanrong,TIAN Aimei. Numerical analysis for aeroelastic stability of labyrinth seals[J]. Journal of Aerospace Power,2018,33(5): 1144-1150. (in Chinese
WANG Nengmao, WANG Yanrong, TIAN Aimei. Numerical analysis for aeroelastic stability of labyrinth seals[J]. Journal of Aerospace Power, 2018, 33(5): 1144-1150. (in Chinese)
|
| [14] |
WANG Nengmao,WANG Yanrong. Aeroelastic stability of labyrinth seal with different structure parameters[J]. MATEC Web of Conferences,2018,179: 01013. doi: 10.1051/matecconf/201817901013
|
| [15] |
ALFORD J S. Protecting turbomachinery from self-excited rotor whirl[J]. Journal of Engineering for Power,1965,87(4): 333-343. doi: 10.1115/1.3678270
|
| [16] |
BACHSCHMID N,PENNACCHI P,VANIA A. Steam-whirl analysis in a high pressure cylinder of a turbo generator[J]. Mechanical Systems and Signal Processing,2008,22(1): 121-132. doi: 10.1016/j.ymssp.2007.04.005
|
| [17] |
张万福,王应飞,张晓斌,等. 基于阻抗法的密封动力特性系数实验识别[J]. 航空学报,2022,43(1): 554-565. ZHANG Wanfu,WANG Yingfei,ZHANG Xiaobin,et al. Experimental identification for rotordynamic coefficients of labyrinth seal based on impedance method[J]. Acta Aeronautica et Astronautica Sinica,2022,43(1): 554-565. (in Chinese doi: 10.7527/j.issn.1000-6893.2022.1.hkxb202201042
ZHANG Wanfu, WANG Yingfei, ZHANG Xiaobin, et al. Experimental identification for rotordynamic coefficients of labyrinth seal based on impedance method[J]. Acta Aeronautica et Astronautica Sinica, 2022, 43(1): 554-565. (in Chinese) doi: 10.7527/j.issn.1000-6893.2022.1.hkxb202201042
|
| [18] |
STOCKER H,COX D,HOLLE G. Aerodynamic performance of conventional and advanced design labyrinth seals with solid-smooth abradable,and honeycomb lands. [gas turbine engines][R]. NASA,CR-135307,1977.
|
| [19] |
李辉,李其汉,晏砺堂. 某实际发动机篦齿封严装置振动特性和稳定性分析[J]. 航空动力学报,2003,18(1): 130-133. LI Hui,LI Qihan,YAN Litang. Vibration character and aeroelastic stability analysis of real labyrinth gas seals[J]. Journal of Aerospace Power,2003,18(1): 130-133. (in Chinese doi: 10.3969/j.issn.1000-8055.2003.01.023
LI Hui, LI Qihan, YAN Litang. Vibration character and aeroelastic stability analysis of real labyrinth gas seals[J]. Journal of Aerospace Power, 2003, 18(1): 130-133. (in Chinese) doi: 10.3969/j.issn.1000-8055.2003.01.023
|
| [20] |
ABBOTT D R. Advances in labyrinth seal aeroelastic instability prediction and prevention[J]. Journal of Engineering for Power,1981,103(2): 308-312. doi: 10.1115/1.3230721
|
DownLoad:
