|Table of Contents|

Analysis and diagnosis of turbine pump rotor instability(PDF)

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

Issue:
2020年04期
Page:
23-30
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis and diagnosis of turbine pump rotor instability
Author(s):
JIN Lu1; 2;  WANG Yankai1;  WANG Tong1;  LIAO Mingfu1;  HUANG Hong2
(1.School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China; 2.Science and Technology on Liquid Rocket Engine Laboratory,Xi’an 710100,China)
Keywords:
sleeve structure;  stability;  internal friction instability;  turbine pump;  rotor
PACS:
V434.21
DOI:
-
Abstract:
As a typical structure of liquid rocket engine turbo pump, the sleeve structure has the risk of vibration instability during its high-speed operation.Therefore, it is necessary to dissect the failure mechanism of the sleeve structure and reveal the nature of instability.In this paper, the dynamic model of the inner friction of the sleeve structure was established, and the expression of the internal friction of the sleeve structure was derived.The dynamic model of the inner friction of the rotor with the sleeve was obtained, and the cause of the instability vibration was explained.The simulation was obtained.The vibration characteristics of internal friction instability of the sleeve rotor were summarized.The influences of various influencing factors on the instability threshold and the instability vibration characteristics were summarized, and the experimental verification was carried out.Through the above research, it is found that the factors such as the shaft span, the mating surface diameter, the shaft stiffness, the eccentricity and the fit clearance are the key parameters for the instability, and the stability check is required during the design and assembly process.The influence of the influencing factors on the instability vibration can provide technical support for rotor stability design with similar structure.

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Last Update: 2020-07-30