Mixing Enhancement of Opposed Quench Jets in a RQL Combustor

DOI

10.2991/asei-15.2015.44How to use a DOI?

Keywords

Combustion, RQL, Mixing, Jet, PLIF.

Abstract

Rich burn - Quick quench - Lean burn (RQL) combustion technology is one of the most promising low emission combustion technologies for aeroengines. During the whole process of RQL, rapid and effective mixing in the quenching zone is critical for its key role of bridging rich burn and lean burn processes. This paper carries out experiments and numerical simulation to investigate the mixing characteristics of the opposed quench jets on the annular RQL combustor simulator liners with the swirl flow. Acetone (CH3COCH3) Planar Laser Induced Fluorescence (PLIF) is used to capture concentration distribution reflecting mixing of jets and main flow on the quench holes center section. The jet Reynolds number (1860-5580) and momentum flux ratio (0.04-5.76) are two key parameters investigated. Mixing non-uniformity is then analyzed based on the concentration results and non-swirl main flow conditions results were also obtained for comparison. CFD simulation model of the combustor test rig is created and Large-Eddy-Simulation (LES) model is adopted to demonstrate transient flow pattern details as well as to predict penetration trajectories. Results of mixing non-uniformity shows combination effect of the jet Reynolds number and momentum flux ratio, pointing out that optimal momentum flux ratio can be utilized to realize the most uniform mixing at certain jet Reynolds number. While for jets penetration performance, jet Reynolds number seems to make no difference, which is only influenced by the momentum flux ratio. Besides, effect rule obtained from non-swirl mixing cannot be applied to jets mixing with swirling main flow.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Ronghai Mao
AU  - Suhua Shen
AU  - Bing Ge
AU  - Yongbin Ji
PY  - 2015/05
DA  - 2015/05
TI  - Mixing Enhancement of Opposed Quench Jets in a RQL Combustor
BT  - Proceedings of the 2015 International conference on Applied Science and Engineering Innovation
PB  - Atlantis Press
SP  - 210
EP  - 219
SN  - 2352-5401
UR  - https://doi.org/10.2991/asei-15.2015.44
DO  - 10.2991/asei-15.2015.44
ID  - Mao2015/05
ER  -