|Table of Contents|

Research on effects of longitudinal pressure oscillation on fuel mixing process in combustion chamber(PDF)

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

Issue:
2020年06期
Page:
60-68
Research Field:
研究与设计
Publishing date:

Info

Title:
Research on effects of longitudinal pressure oscillation on fuel mixing process in combustion chamber
Author(s):
WANG Guangxu1; LIU Zhanyi1; TAN Yonghua2; CHEN Jianhua1; CHEN Hongyu1
(1.Science and Technology on Liquid Rocket Engine Laboratory, Xi'an Aerospace Propulsion Institute, Xi'an 710100, China; 2.Academy of Aerospace Propulsion Technology, Xi'an 710100, China)
Keywords:
pressure oscillation;  jet flow and mixing;  combustion instability
PACS:
V231.1
DOI:
-
Abstract:
For gas/gas shear coaxial injector, the propellant is mixed by coherent vortex produced coaxial jet flow and its shear process.This process not only determined final heat release distribution downstream, but also prone to be affected by pressure oscillation in combustion chamber.Research on this problem has a significant meaning for further understanding of high frequency combustion instability.Through unsteady combustion field simulation, longitudinal pressure oscillation process and corresponding vorticity field of a combustor with single injector under different stability conditions was given.Effects of pressure oscillation with different amplitudes on fuel mixing process by shear jet flow was analyzed through compared analysis.Relation between the concentration and position to antinode of main combustion zone and the stability was also discussed.It is indicated that pressure oscillation in combuston chamber will significantly affect the jet flow and mixing process of gaseous fuel.Transverse vibration of coherent vortex structure will be enhanced, which lead to corresponding heat release zone and temperature distribution more close to the acoustic antinode near the injector face.Furthermore, improve the outlet kinetic energy of fuel jet will make combustion heat release zone more scattered along axial direction, which is beneficial to stability.

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