|Table of Contents|

Identification of attenuation coefficient for thermoacoustic oscillation in combustion chamber based on variational mode decomposition(PDF)

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

Issue:
2023年05期
Page:
23-31
Research Field:
目次
Publishing date:

Info

Title:
Identification of attenuation coefficient for thermoacoustic oscillation in combustion chamber based on variational mode decomposition
Author(s):
FAN Zhiwei;  ZHONG Zhan;  LI Geng;  NIE Wansheng;  HE Bo
(Department of Aerospace Science and Technology, Aerospace Engineering University, Beijing 101400, China)
Keywords:
combustion stability;  attenuation coefficient;  system identification;  resonant frequency;  filter width;  variational mode decomposition
PACS:
V231.1
DOI:
-
Abstract:
Based on the pressure oscillation signal of the stable combustion stage of the liquid rocket engine combustion chamber, extracting the thermoacoustic resonant mode frequency and its amplitude, and establishing the theoretical model of thermoacoustic oscillation of different complexity to identify and obtain the attenuation coefficients of each mode, is an important means to evaluate the combustion stability margin of the combustion chamber in current experiments. A theoretical model of thermoacoustic oscillation with a second-order stochastic oscillator is established, and the thermoacoustic resonant mode of the pressure oscillation signal is extracted by the steep maximum variational mode decomposition algorithm, and then the mode extraction algorithm and the time/frequency domain identification method are verified. In addition, it is applied to the combustion stability margin evaluation and analysis of a needle-bolt gas oxygen/ethanol model engine. The results show that compared with the traditional bandpass filtering algorithm,the steep maximum variational mode algorithm effectively improves the extraction accuracy and convenience of thermoacoustic resonant mode.

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