|Table of Contents|

Dynamic behavior of multi-component coupling rotor system in high-speed turbopumps(PDF)

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

Issue:
2023年05期
Page:
46-58
Research Field:
目次
Publishing date:

Info

Title:
Dynamic behavior of multi-component coupling rotor system in high-speed turbopumps
Author(s):
ZHANG Guoyuan1;  LIAN Jiaru1;  ZHAO Weigang2;  LIANG Maotan1;  ZHAO Yangyang1
(1.School of Electromechanical Engineering, Xidian University, Xi'an 710071, China; 2.Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)
Keywords:
multi-component coupling;  rotor dynamic;  floating-ring seal;  mechanical seal;  stability
PACS:
V231.96; TH113
DOI:
-
Abstract:
The high-speed turbopump in cryogenic liquid rocket engines is composed of some important tribological basic components constrained by small gaps, such as multistage floating-ring seals, shaft end mechanical seal, rolling bearings, etc. The inter-coupling of fluids in gaps and multiple solid components has an effect on the dynamic behavior of the whole rotor system. Therefore, the study on the mechanism of dynamic behavior evolution has become the theoretical basis for the development of the whole rotor system towards higher performance and more extreme conditions(high-speed, high-pressure, low/high-temperature). Firstly, considering the fluid film thickness equation, dynamic Reynolds equation, lubricant property equation and force balance equation of the support spring element, the thermoelastic flow model of the mechanical seal and the dynamic performance analysis model of the floating-ring seal are constructed. Secondly, by coupling the above models for tribological components, a dynamic model for the rotor system of the high-speed turbopump containing the mechanical seal, floating-ring seal, and rolling bearings are developed. Finally, a numerical method for the above dynamic model is proposed, and the evolution mechanism of the dynamic behavior of the turbopump system under typical working conditions is discussed. The results show that the combined floating-ring seals have little effect on critical characteristics and lead to an increase in the transient response of the system and a decrease in unstable speed.

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