Control of heat release and no emissions in a combustor through modulation of transverse air-jets

Onur Tuncer, Sumanta Acharya*, Jong Ho Uhm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The effect of modulated air jets, introduced through the combustor shell, on the temperature distribution and nitric oxide emissions is investigated. Temperature and emissions measurements have been made at a number of forcing frequencies in the range of 100-850Hz, blowing ratios in the range of 4-10 and equivalence ratios between 0.6 and 1.0. Open-loop flame response to forcing has also been acquired by recording pressure spectra. Results show that substantial reductions in nitric oxide emissions index (15-30%) can be obtained over a wide range of flow conditions with side-air jet forcing. In addition, forcing also alters the time averaged temperature field, with higher mean temperatures close to the dump plane, due to enhanced fuel-air mixing. The higher temperatures and volumetric heat release obtained with forcing can enable more compact combustor designs. The lower emissions are potentially linked to greater unsteadiness with forcing.

Original languageEnglish
Pages (from-to)2255-2278
Number of pages24
JournalCombustion Science and Technology
Volume179
Issue number11
DOIs
Publication statusPublished - Nov 2007
Externally publishedYes

Keywords

  • Emissions
  • Forced jet
  • Mixing
  • Spray combustion

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