|Table of Contents|

Critical speed identification of quasi-rigid rotor for turbo-pump(PDF)

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

Issue:
2022年03期
Page:
25-31
Research Field:
研究与设计
Publishing date:

Info

Title:
Critical speed identification of quasi-rigid rotor for turbo-pump
Author(s):
HUANG Jinping;  XUE Jie;  DOU Yu;  QIN Jie;  LEI Dangbin
(Science and Technology on Liquid Rocket Engine Laboratory,Xian Aerospace Propulsion Institute,Xian 710100, China)
Keywords:
turbo-pump rotor gravity sub-criticality critical speed
PACS:
V43
DOI:
-
Abstract:
Taking the Jeffcott rotor system as the study object, the phenomenon of gravity subcriticality is introduced theoretically.On the basis of the finite element model of rotating shaft and the correction of bearing support stiffness, the first two critical speeds and modes of the turbo-pump of a large thrust liquid rocket engine with staged combustion cycle are simulated.Through the high speed operation test, the first two critical speeds of the rotor have been identified with the help of gravity subcriticality, and compared with the identification results and simulation results of full speed operation, the errors of the first-order and the second-order critical speed identification results were less than 4.74 and 6.74, respectively.The results show that the slight change of rolling body contacting state of angular contact bearing will change the bearing stiffness and the rotor system response at high speed, so it is difficult to accurately identify the critical speed from the response data in the full speed range.The running stability of the rolling bearing-rotor is good at low speed and the identification of rotor critical speed(especially the first-order critical speed identification)using the gravity subcritical method based on the data of low speed operation has a high accuracy.

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