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Dynamic characteristics simulation and analysis for the flexible rotor of an ultrahigh speed hydrogen turbopump(PDF)

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

Issue:
2022年02期
Page:
86-93
Research Field:
目次
Publishing date:

Info

Title:
Dynamic characteristics simulation and analysis for the flexible rotor of an ultrahigh speed hydrogen turbopump
Author(s):
DU Jialei; WANG Yixuan; LI Ming; JIANG Xuqiang; CHU Baoxin
(Beijing Aerospace Propulsion Institute, Beijing 100076, China)
Keywords:
hydrogen turbopump flexible rotor rotor dynamics critical speed stability
PACS:
V434.1
DOI:
-
Abstract:
This paper concerns the design of rotor dynamic characteristics of an ultrahigh speed hydrogen turbopump for a 25 tf expander cycle engine.The dynamic model of the rotor-bearing system was established using finite element method.The influence of design parameters on the critical speeds and stability of the rotor was calculated and analyzed, considering the effects of vibration of supporting structure, fluid forces of seals and variation of supporting stiffness and damping coefficients with rotational speed, etc.Some improvement measures for the rotor system were put forward.The results show that the presented design scheme of the turbopump rotor system can meet the rotor critical speed and bending strain energy rate design criteria, and the initial design objectives.The minimum first-order logarithmic decrement of the rotor in the working speed range is about 0.15, which achieves the minimum standard for rotor stability design criteria.According to the test experiences of other turbopumps, measures should be taken to increase the logarithmic decrements to more than 0.22.It is suggested that the stiffness of the elastic supporter at the pump end should be weakened properly, and the fluid seals in the cantilever section of the rotor should be redesigned from a tooth-shaped structure to a more damped orifice structure, so as to further improve the stability margin of the rotor.

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