|Table of Contents|

Time domain distributed parameter system dynamic model of combustion components(PDF)

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

Issue:
2022年04期
Page:
29-35
Research Field:
目次
Publishing date:

Info

Title:
Time domain distributed parameter system dynamic model of combustion components
Author(s):
LI Yuanqi1;  ZHAO Xiaohui1;  CHEN Hongyu1;  LIU Hongjun2;  LIU Shang1
(1.Xian Aerospace Propulsion Institute, Xian 710100, China 2.School of Aerospace, Northwestern Polytechnical University, Xian 710072, China)
Keywords:
liquid rocket engine combustion components distributed parameter method nonlinear time domain model
PACS:
V433.9
DOI:
-
Abstract:
The dynamic characteristics of liquid rocket engines, especially the system dynamics characteristics related to combustion components, have always been an important research content in theoretical research and engineering design.In this paper, the dynamic model of nonlinear distributed parameter combustion module was established in time domain.The research range of frequency in the time domain was extended from low frequency to middle and high frequency which covers the first order longitudinal acoustic frequency.The numerical solution of the model was carried out by the method of space and time separation, the model was spatially discretized by the ROE scheme, and the time discretized by the Dassl implicit variable step size scheme.So the problem of rigid partial differential equation was solved.Examples of passive isocross section, passive variable cross section and linear heat source show that the correct steady-state solution of gas path and basically capture the discontinuous characteristics of flow field can be obtained by the model.The gas-path examples of entropy wave and sound wave show that the characteristics of low-frequency entropy wave and high-frequency sound wave can accurately be reflected by the model.The dissipation phenomenon of entropy wave at high frequency can also be described.

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