Effect of fuel injection location on a plasma jet assisted combustion with a backward-facing step

Chae Hyoung Kim, In Seuck Jeung, Byungil Choi, Toshinori Kouchi, Kenichi Takita, Goro Masuya

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Non-reacting and reacting experiments on the ignition by a plasma jet (PJ) torch were performed to understand the correlation between fuel injection location and combustion characteristics in unheated Mach 2 airflow. Fuel was injected through three sonic injectors in the recirculation region behind a backward-facing step: a parallel injector at 2 mm from the bottom wall and two normal injectors at 2 and 9 mm from the step wall. In order to mitigate the combustion pressure interaction with nozzle, an isolator was installed between the nozzle and combustor. The combustion performance of normal injection was little affected by the difference of fuel injection locations. Moreover, normally injected fuel was escaped not to be held in the recirculation region despite of low fuel injection rates. This led to lower combustion performance relative to the parallel injection which provided fuel not to leave the recirculation region. In this case, the role of the recirculation region was to fully hold fuel, and the PJ torch provided hot gases as a heat source and acted as a flame-holder to ignite fuel-air mixtures. In a low temperature inflow condition, combustible regions were constrained around the bottom wall where embedded with the PJ torch. When thermal choking occurred in the combustor, it induced shock train both in the combustor and isolator. Under this unstable condition, the combustion performance of the normal injection was lower than that of the parallel injection. This is because the normal injection led most fuel into low temperature incoming air-stream.

Original languageEnglish
Pages (from-to)2375-2382
Number of pages8
JournalProceedings of the Combustion Institute
Volume33
Issue number2
DOIs
Publication statusPublished - 2011
Externally publishedYes

Fingerprint

backward facing steps
fuel injection
Plasma jets
Fuel injection
plasma jets
torches
injection
combustion chambers
Combustors
injectors
isolators
nozzles
Nozzles
flame holders
air
high temperature gases
heat sources
Air
Mach number
ignition

Keywords

  • Backward-facing step
  • Fuel injection location
  • Plasma jet torch
  • Shock train
  • Thermal choking

ASJC Scopus subject areas

  • Mechanical Engineering
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Effect of fuel injection location on a plasma jet assisted combustion with a backward-facing step. / Kim, Chae Hyoung; Jeung, In Seuck; Choi, Byungil; Kouchi, Toshinori; Takita, Kenichi; Masuya, Goro.

In: Proceedings of the Combustion Institute, Vol. 33, No. 2, 2011, p. 2375-2382.

Research output: Contribution to journalArticle

Kim, Chae Hyoung ; Jeung, In Seuck ; Choi, Byungil ; Kouchi, Toshinori ; Takita, Kenichi ; Masuya, Goro. / Effect of fuel injection location on a plasma jet assisted combustion with a backward-facing step. In: Proceedings of the Combustion Institute. 2011 ; Vol. 33, No. 2. pp. 2375-2382.
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