|Table of Contents|

Analysis on modal influence factors and vibration safety of rocket engine turbine disk(PDF)

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

Issue:
2021年01期
Page:
21-28
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis on modal influence factors and vibration safety of rocket engine turbine disk
Author(s):
DU Dahua1; HUANG Daoqiong1; HUANG Jinping1; WU Zhihua2
(1. Science and Technology on Liquid Rocket Engines Laboratory, Xi'an 710100, China; 2. R&D Center of System Engineering Department, Academy of Aerospace Propulsion Technology, Xi'an 710100, China)
Keywords:
modal characteristics;  vibration safety;  turbine disk;  liquid rocket engine
PACS:
V434.2
DOI:
-
Abstract:
The modal characteristics and vibration safety of the turbine disk structure are the basis for its dynamics design. First, on the basis of the modal test, an accurate dynamic model of the disk was established. Secondly, the modal analysis was carried out under the effect of multi-physics field, which aimed at studying the influence of temperature field, stress field and coupling effect on the modal characteristics during the disk operating. Finally, the vibration safety of disk was evaluated to obtain its vibration safety margin. The research shows that, the rotational "stiffening" effect of centrifugal force increases the modal frequencies, the temperature effect causes the structural stiffness to decrease and the frequency to decrease, and the aerodynamic force causes the structure to "stiffening" and the frequency to reduce. Under the combined action of force and heat, the order of the degree of influence on the first 6-order modal frequencies are speed, temperature, elastic modulus, thermal stress and aerodynamic force, and the influence of aerodynamic force is negligible. The force and thermal load affect the modal frequency, but not the modal shape. Moreover, the possibility of low-order diameter modals traveling wave coupling resonance of the disk structure excited by turbine gas is very small.

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Last Update: 2021-02-20