Journal
COMBUSTION AND FLAME
Volume 160, Issue 4, Pages 796-807Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2012.12.006
Keywords
Plasma; Diagnostics; Laminar flames; Ignition; Microwave enhancement
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Funding
- US Air Force Office of Scientific Research MURI
- Air Force Office of Scientific Research through a National Defense Science and Engineering Graduate (NDSEG) fellowship
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An investigation of pulsed microwave energy addition to laminar methane/air flame fronts is undertaken. Microwave coupling efficiencies of up to 60% are measured in a microwave resonator with very low average power requirements (<30 W). Pulsed microwave energy addition to laminar flame fronts is quantified using power absorption measurements and compared with filtered Rayleigh scattering temperature measurements of a laminar stagnation flame. Relative increases in nitric oxide concentrations are measured using a selective radar REMPI laser technique. For outwardly propagating methane/air flames, short microwave pulse bursts increase the effective flame speed up to 25%. With microwave pulse bursts, results show the ability to sustain deflagration fronts at ultra-lean equivalence ratios of 0.3 (compared to the 0.6 normal lean limit) with microwave energy deposition of 10% of the available thermal energy content of the fuel. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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