LES Investigation of Combustion Instability on GO2/GCH4 Shear Flame Based on Dynamic Thickened Flame Model

被引：0

作者：

Yuan M.-C. ^{[1
]}

Wang P. ^{[1
]}

Yu N.-J. ^{[2
]}

Zhang Y. ^{[1
]}

Cheng K. ^{[1
]}

机构：

[1] Institute for Energy Research, Jiangsu University, Zhenjiang

[2] School of Astronautics, Beihang University, Beijing

来源：

Tuijin Jishu/Journal of Propulsion Technology | 2022年 / 43卷 / 12期

关键词：

Combustion instabili⁃ ty; DTF combustion model; Large eddy simulation; Liquid rocket engine; POD decomposition;

D O I：

10.13675/j.cnki.tjjs.210808

中图分类号：

学科分类号：

摘要：

In order to improve the understanding of flow-induced combustion instability mechanism in liq⁃ uid rocket engines，Large Eddy Simulation（LES）was carried out for gas-oxygen/gas-methane coaxial shear in⁃ jection combustion test using the Dynamic Thickened Flame（DTF）model. Two cases with different fuel-oxy⁃ gen velocity ratio under the same oxygen-fuel mixing ratio were simulated. The predicted OH distribution is in good agreement with the PLIF results. When the fuel-oxygen velocity ratio is 0.5，the flame transits from lami⁃ nar to turbulent along the flow direction，while the thickness of shear layer and the level of wrinkle increase sig⁃ nificantly. When the velocity ratio is 1.5，the flame becomes unstable with periodic quenching and reignition. The large-scale coherent structure that plays a dominant role in quenching was obtained by Proper Orthogonal Decomposition（POD）associating OH with velocity distribution sequences，which further linked the recon⁃ structed flow with the dynamic evolution of flame and revealed the influence process of flow factors on flame in⁃ stability. © 2022 Journal of Propulsion Technology. All rights reserved.

引用

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