NDLI: Laser-Based Investigation on a Dry Low Emission Industrial Prototype Burner at Atmospheric Pressure Conditions

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Subash, Arman Ahamed Collin, Robert Aldén, Marcus Kundu, Atanu Klingmann, Jens
Copyright Year	2016
Abstract	Experiments were performed at atmospheric pressure conditions on the prototype 4th generation DLE burner. The combustion changes that occur for alteration of the operating conditions by changing the equivalence ratios (ϕ) for CH4 as fuel at different sections of the burner, were optically investigated. The burner assembly has three concentrically arranged premixed burner sections: an outer Main section, an intermediate section (Pilot) and a central pilot body or pre-chamber combustor, called RPL (Rich-Pilot-Lean) section. All sections are facilitated to vary equivalence ratios to achieve optimal combustion. Planar laser-induced fluorescence (PLIF) of OH radicals and flame chemiluminescence imaging were applied to study the local flame characteristics in order to investigate turbulence-flame interaction and formation of reaction zone at the burner exit. The results show that the position and shape of the flame are clearly affected by the variation of equivalence ratios at different sections of the burner. During the experiments, first the RPL, then the Pilot and the Main flame were added in a step wise manner keeping constant the total air flow for the global ϕ = 0.5 in order to understand the flame contributions from the different combustion sections. It is observed that for the RPL fuel lean conditions, the primary combustion starts and reaches completion before exiting the burner throat while for rich conditions, the residual fuel escapes out through the RPL exit with primary combustion products and starts secondary combustion along with the Pilot and Main combustion. At the global ϕ = 0.5, for changing the RPL ϕ from lean to rich conditions, the flame stabilization region moves downstream of the burner exit and the flame front fluctuation along inner shear layer increases. For increasing the global ϕ and increasing the Pilot fuel ratio (PFR) without changing the RPL and the global ϕ, the total extension of the flame becomes shorter and the flame stabilization region moves upstream.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791849767
DOI	10.1115/GT2016-57242
Volume Number	Volume 4B: Combustion, Fuels and Emissions
Conference Proceedings	ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
Language	English
Publisher Date	2016-06-13
Publisher Place	Seoul, South Korea
Access Restriction	Subscribed
Subject Keyword	Methane Turbulence Atmospheric pressure Fluorescence Combustion Chemiluminescence Fuels Emissions Flames Air flow Lasers Imaging Manufacturing Shapes Combustion chambers Shear (mechanics) Engineering prototypes
Content Type	Text
Resource Type	Article

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