Mesoscale burner array performance analysis

Rajavasanth Rajasegar, Jeongan Choi, Brendan McGann, Anna Oldani, Tonghun Lee, Stephen D. Hammack, Campbell D. Carter, Jihyung Yoo

Research output: Contribution to journalArticlepeer-review

Abstract

Combustion characteristics of a mesoscale burner array have been studied using several diagnostic and analysis techniques. The array was specifically configured to enhance overall combustion stability, particularly under lean operating conditions, by promoting flame to flame interactions between neighboring elements. The 4 × 4 burner array demonstrated stable operations up to 3 kW and is designed to flexibly accommodate wide range of combustion power outputs by scaling the element dimensions or array size. Flame stabilizing mechanisms were experimentally examined using OH, CH, and CH2O planar laser induced fluorescence (PLIF) of premixed CH4 and air flames at operating equivalence ratios between 0.7 and 1.2. A quantitative measure of flame stability was obtained through dynamic mode decomposition (DMD) analysis of high speed OH-PLIF images. Lean blow off limits and emissions were also characterized across a wider range of equivalence ratios to better understand mesoscale burner array combustion characteristics. Lastly, combustion experiments using liquid fuel, pentane (C5H12), were also carried out. Marked improvement in combustion stability was observed compared to a single swirl-stabilized flame of similar power output. Results indicate mesoscale burner arrays can potentially serve as flexible and scalable next generation propulsion and power generation systems.

Original languageEnglish (US)
Pages (from-to)324-337
Number of pages14
JournalCombustion and Flame
Volume199
DOIs
StatePublished - Jan 2019

Keywords

  • Acoustic perturbation
  • Combustion instability
  • Dynamic mode decomposition
  • High-speed PLIF
  • Lean blow off limits
  • Swirl stabilization

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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