CFD analysis of jet mixing in low NO sub x flametube combustors

The Rich-burn/Quick-mix/Lean-burn (RQL) combustor has been identified as a potential gas turbine combustor concept to reduce NO{sub x} emissions in High Speed Civil Transport (HSCT) aircraft. To demonstrate reduced NO{sub x} levels, cylindrical flametube versions of RQL combustors are being tested a...

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Bibliographic Details
Published in:Journal of engineering for gas turbines and power 1992-04, Vol.114:2
Main Authors: Talpallikar, M.V., Smith, C.E., Lai, M.C., Holdeman, J.D.
Format: Article
Language:English
Subjects:
330701 - Emission Control- Nitrogen Oxides
421000 - Engineering- Combustion Systems
990200 - Mathematics & Computers
ADVANCED PROPULSION SYSTEMS
AIRCRAFT
ASPECT RATIO
CHALCOGENIDES
COMBUSTORS
COMPUTER CODES
DYNAMICS
ENGINEERING
FLAMES
FLUIDS
GAS TURBINES
GASES
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
INHIBITION
JETS
MACHINERY
MATHEMATICS
MECHANICS
MIXING
NASA
NATIONAL ORGANIZATIONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL ANALYSIS
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
R CODES
THREE-DIMENSIONAL CALCULATIONS
TURBINES
TURBOMACHINERY
US ORGANIZATIONS
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Summary:The Rich-burn/Quick-mix/Lean-burn (RQL) combustor has been identified as a potential gas turbine combustor concept to reduce NO{sub x} emissions in High Speed Civil Transport (HSCT) aircraft. To demonstrate reduced NO{sub x} levels, cylindrical flametube versions of RQL combustors are being tested at NASA Lewis Research Center. A critical technology needed for the RQL combustor is a method of quickly mixing bypass combustion air with rich-burn gases. In this paper, just mixing n a cylindrical quick-mix section was numerically analyzed. The quick-mix configuration was five inches in diameter and employed 12 radial-inflow slots. The numerical analyses were performed with an advanced, validated 3-D Computational Fluid Dynamics (CFD) code named REFLEQS. Parametric variation of jet-o-to-mainstream momentum flux ratio (J) and slot aspect ratio was investigated. Both nonreacting and reacting analyses were performed. Results showed mixing and NO{sub x} emissions to be highly sensitive to J and slot aspect ratio. Lowest NO{sub x} emissions occurred when the dilution jet penetrated to approximately midradius. The viability of using 3-D CFD analyses for optimizing jet mixing was demonstrated.
ISSN:0742-4795
1528-8919
DOI:10.1115/1.2906607