|Table of Contents|

Analysis on rotor dynamic of a turbopump considering seal coupling effect(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2022年03期
Page:
16-24
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis on rotor dynamic of a turbopump considering seal coupling effect
Author(s):
YANG Baofeng1;  JIN Lu1;  XU Kaifu1;  CHEN Hui1; 2;  HUANG Jinping1; 2
(1.Xian Aerospace Propulsion Institute, Xian 710100, China 2.Science and Technology on Liquid Rocket Engine Laboratory, Xian 710100, China)
Keywords:
turbopump rotor dynamics seal coupling critical speed unbalanced response
PACS:
V434.21
DOI:
-
Abstract:
In the turbopump of a liquid rocket engine, the stiffness coefficient and the damping coefficient introduced by the annular seal with small gap vary with the rotating speed of the rotor, showing as the weak coupling effect, and then it has further impacts on dynamic characteristics of the rotor system.To obtain the influence of the seal coupling effects on the rotordynamic characteristics of turbopump, the dynamic equations of the rotor-seal system were derived based on the finite element method and the matrix operation method.A coupling solving method considering the variation of seal dynamic coefficient with the operating conditions of turbopump was proposed, and the influence of the seal coupling effect on the critical speed and unbalance response of the rotor system was achieved.The results show that the first-order and the second-order critical speeds of the rotor system increase obviously when considering the seal effects, and the second-order critical speed increases more significantly.With the increase of the support stiffness of the turbine end, the effect of seal on the first-order critical speed is enhanced, and the variation amplitude increases from 8.13 to 37.42.The unbalanced response of the key components in turbopump rotor system dramatically reduces due to the introduction of seal damping, and the reduction can be more than 50.

References:

[1] 杨宝锋,贾少锋,李斌,等.大偏心及大扰动下涡轮泵密封转子动力特性[J].火箭推进,2019,45(6):1-9.
YANG B F,JIA S F,LI B,et al.Investigation on rotordynamic characteristics of a turbopump seal under large eccentricities and disturbances[J].Journal of Rocket Propulsion,2019,45(6):1-9.
[2] 王正.转动机械的转子动力学设计[M].北京:清华大学出版社,2015.
[3] 杨永锋,任兴民,徐斌.国外转子动力学研究综述[J].机械科学与技术,2011,30(10):1775-1780.
[4] 张大义,刘烨辉,洪杰,等.航空发动机整机动力学模型建立与振动特性分析[J].推进技术,2015,36(5):768-773.
[5] 张大义,刘烨辉,梁智超,等.航空发动机双转子系统临界转速求解方法[J].推进技术,2015,36(2):292-298.
[6] 金路,朱东华,王伟,等.基于转子动力学特性分析的局部共振诊断研究[J].火箭推进,2017,43(3):6-9.
JIN L,ZHU D H,WANG W,et al.Fault diagnosis of local resonance based on rotordynamic analysis[J].Journal of Rocket Propulsion,2017,43(3):6-9.
[7] 黄金平,张峥岳,黄道琼,等.高速永磁电机转子动力学特性研究[J].火箭推进,2019,45(3):20-25.
HUANG J P,ZHANG Z Y,HUANG D Q,et al.Research on rotordynamic characteristics of high speed permanent magnet motor[J].Journal of Rocket Propulsion,2019,45(3):20-25.
[8] 赵经明.涡轮泵表面织构间隙密封-转子系统动力学特性研究[D].哈尔滨:哈尔滨工业大学,2018.
[9] CHILDS D W.The space shuttle main engine high-pressure fuel turbopump rotordynamic instability problem[J].Journal of Engineering for Power,1978,100(1):48-57.
[10] CHILDS D.SSME turbopump technology improvements via transient rotordynamic analysis[EB/OL].https://www.semanticscholar.org/paper/SSME-turbopump-technology-improvements-via-analysis-Childs/e66c56ba9fd2b1df3f2f9 7b01d7943f546d9bb02,1975.
[11] EK M C.Solving subsynchronous whirl in the high-pressure hydrogen turbomachinery of the SSME[J].Journal of Spacecraft and Rockets,1980,17(3):208-218.
[12] JEON S M,KWAK H D,YOON S H,et al.Rotordynamic analysis of a turbopump with the casing structural flexibility[J].Journal of Propulsion and Power,2008,24(3):433-436.
[13] JEON S M,KWAK H D,YOON S H,et al.Rotordynamic analysis of a high thrust liquid rocket engine fuel(Kerosene)turbopump[J].Aerospace Science and Technology,2013,26(1):169-175.
[14] 窦唯,褚宝鑫,刘占生.轴承支承总刚度对液体火箭发动机涡轮泵转子系统稳定性影响研究[J].推进技术,2013,34(2):254-262.
[15] 窦唯,叶志明,闫宇龙.液体火箭发动机氢涡轮泵转子动力学特性研究[J].导弹与航天运载技术,2016(4):17-21.
[16] 夏德新.高压多级氢涡轮泵转子动力学设计与试验研究[J].导弹与航天运载技术,2001(6):21-26.
[17] 郑继坤,吴建军.氢氧火箭发动机高速氧涡轮泵转子动力学特性研究[J].导弹与航天运载技术,2005(5):5-9.
[18] 蒋庆磊.环形密封和多级转子系统耦合动力学数值及实验研究[D].杭州:浙江大学,2012.
[19] JIANG Q L,ZHAI L L,WANG L Q,et al.Fluid-structure interaction analysis of annular seals and rotor systems in multi-stage pumps[J].Journal of Mechanical Science and Technology,2013,27(7):1893-1902.
[20] 周文杰.多级离心泵转子耦合系统动力学特性研究[D].杭州:浙江大学,2016.
[21] WANG L Q,ZHOU W J,WEI X S,et al.A coupling vibration model of multi-stage pump rotor system based on FEM[J].Mechanics,2016,22(1):31-37.
[22] 姜新阔.环形密封瞬态流场模拟及其动力学特性研究[D].杭州:浙江大学,2016.
[23] 关醒凡.泵的理论与设计[M].北京:机械工业出版社,1987.

Memo

Memo:
-
Last Update: 1900-01-01