Application of Dielectric Barrier Discharge to improve the flashback limit of a lean premixed dump combustor

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Proceedings titleProceedings of the ASME Turbo Expo
ConferenceASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011, 6 June 2011 through 10 June 2011, Vancouver, BC
Pages175184; # of pages: 10
SubjectAir flow-rate; Combustion zones; Core flow; Dielectric barrier discharges; Dump combustor; Equivalence ratios; Experimental setup; Flame propagation; High temperature; Ionic wind; Low Power; Natural gas-air mixture; Novel applications; Operating condition; Premixed; Syn-gas; Velocity profiles; Actuators; Combustion; Dielectric devices; Exhibitions; Flow control; Flow rate; Fuels; Gas turbines; Hydrogen; Natural gas; Quartz; Rate constants; Synthesis gas; Combustors
AbstractIn recent years, lean-premixed (LP) combustors have been widely studied due to their potential to reduce NOx emissions in comparison to diffusion type combustors. However, the fact that the fuels and oxidizers are mixed upstream of the combustion zone makes LP type of combustors a candidate for upstream flame propagation (i.e., flashback) in the premixer that is typically not designed to sustain high temperatures. Moreover, there has been a recent demand for fuel-flexible gas turbines that can operate on hydrogen-enriched fuels like Syngas. Combustors originally designed for slower kinetics fuels like natural gas can potentially encounter flashback if operated with faster burning fuels like those containing hydrogen as a constituent. There exists a clear need in fuel-flexible lean-premixed combustors to control flashback that will not only prevent costly component damage but will also enhance the operability margin of engines. A successful attempt has been made to control flashback in an atmospheric LP combustor, burning natural gas-air mixtures, via the application of Dielectric Barrier Discharge (DBD). A low-power DBD actuator was designed, fabricated and integrated into a premixer made out of quartz. The actuator was tuned to produce a low magnitude ionic wind with an intention to modify the velocity profile in the premixer. Flashback conditions were created by decreasing the air flow rate while keeping the fuel flow rate constant. Within this experimental setup, flashback happened in the core flow along the axis of the cylindrical premixer. Results show that the utilization of the DBD delays the occurrence of flashback to higher equivalence ratios. Improvements as high as about 5% of the flashback limit have been obtained without compromising the blowout limit. It is anticipated that this novel application of DBD will lead to future demonstrations of the concept under realistic gas turbine operating conditions. Copyright © 2011 by Her Majesty the Queen in Right of Canada.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271160
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Record identifier3b225ec2-5e8b-4d16-8b42-ff6859a16205
Record created2014-03-24
Record modified2016-05-09
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