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Title: Premixed burner experiments: Geometry, mixing, and flame structure issues

This research program is exploring techniques for improved fuel-air mixing, with the aim of achieving combustor operations up to stoichiometric conditions with minimal NO x and maximum efficiency. The experimental studies involve the use of a double-concentric natural gas burner that is operable in either premixed or non-premixed modes, and the system allows systematic variation of equivalence ratio, swirl strength shear length region and flow momentum in each annulus. Flame structures formed with various combinations of swirl strengths, flow throughput and equivalence ratios in premixed mode show the significant impact of swirl flow distribution on flame structure emanating from the mixedness. This impact on flame structure is expected to have a pronounced effect on the heat release rate and the emission of NO{sub x}. Thus, swirler design and configuration remains a key factor in the quest for completely optimized combustion. Parallel numerical studies of the flow and combustion phenomena were carried out, using the RSM and thek-{epsilon} turbulence models. These results have not only indicated the strengths and limitations of CFD in performance and pollutants emission predictions, but have provided guidelines on the size and strength of the recirculation produced and the spatio-temporal structure of the combustion flowfield. The firstmore » stage of parametric studies on geometry and operational parameters at Morgan State University have culminated in the completion of a one-dimensional flow code that is integrated with a solid, virtual model of the existing premixed burner. This coupling will provide the unique opportunity to study the impact of geometry on the flowfield and vice-versa, with particular emphasis on concurrent design optimization.« less
Authors:
; ;  [1]
  1. Univ of Maryland, College Park, MD (United States) [and others
Publication Date:
OSTI Identifier:
269469
Report Number(s):
DOE/METC--96/1023-Vol.2; CONF-9510109--Vol.2
ON: DE96000562; CNN: Contract 94-01-SR028; TRN: 96:002470-0020
Resource Type:
Conference
Resource Relation:
Conference: Advanced turbine systems (ATS) annual review, Morgantown, WV (United States), 17-18 Oct 1995; Other Information: PBD: Oct 1995; Related Information: Is Part Of Proceedings of the Advanced Turbine Systems Annual Program Review meeting. Volume 2; PB: 412 p.
Research Org:
USDOE Morgantown Energy Technology Center, WV (United States); USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States). Office of Industrial Technologies
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 33 ADVANCED PROPULSION SYSTEMS; GAS TURBINES; COMBUSTORS; GEOMETRY; PERFORMANCE; NITROGEN OXIDES; AIR POLLUTION CONTROL; GAS TURBINE POWER PLANTS; MIXING; FLAMES; FLUID FLOW