|Table of Contents|

Investigation on rotordynamic characteristics of a turbopump seal under large eccentricities and disturbances(PDF)

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

Issue:
2019年06期
Page:
1-9
Research Field:
研究与技术
Publishing date:

Info

Title:
Investigation on rotordynamic characteristics of a turbopump seal under large eccentricities and disturbances
Author(s):
YANG Baofeng1; 2;  JIA Shaofeng2;  LI Bin1; 3;  CHEN Hui1; 2
(1.Science and Technology on Liquid Rocket Engine Laboratory, Xi’an 710100, China; 2.Xi’an Aerospace Propulsion Institute, Xi’an 710100, China; 3.Academy of Aerospace Propulsion Technology, Xi’an 710100, China)
Keywords:
turbopump;  seal;  large eccentricity;  large disturbance;  Bulk-Flow;  computational fluid dynamics;  dynamic characteristics
PACS:
V434.21
DOI:
-
Abstract:
A revised Bulk-Flow model and the quasi-steady CFD method were adopted to investigate the rotordynamic characteristics of a turbopump floating ring seal under large eccentricities and disturbances.The precision and reliability of these two methods were verified by the seal test data and the variation of the rotordynamic characteristics of the seal under different eccentricities and disturbances were obtained.Results show that the revised Bulk-Flow model and the CFD method can effectively predict the rotordynamic coefficients of seals and the CFD method presents better accuracy.For high-pressure-speed turbopumps, the stiffness introduced by a floating ring seal is comparable to the stiffness of the rolling bearing, thus the influence of the seal on rotor dynamic characteristics should not be ignored.The rotordynamic coefficients increase significantly under large eccentricities while the complex nonlinear relationship is depicted between these coefficients and large disturbances.

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Last Update: 2019-12-20