Effect of hydrogen addition on autoignited methane lifted flames

Handle URI:
http://hdl.handle.net/10754/562050
Title:
Effect of hydrogen addition on autoignited methane lifted flames
Authors:
Choin, Byung Chul; Chung, Suk-Ho ( 0000-0001-8782-312X )
Abstract:
Autoignited lifted flames in laminar jets with hydrogen-enriched methane fuels have been investigated experimentally in heated coflow air. The results showed that the autoignited lifted flame of the methane/hydrogen mixture, which had an initial temperature over 920 K, the threshold temperature for autoignition in methane jets, exhibited features typical of either a tribrachial edge or mild combustion depending on fuel mole fraction and the liftoff height increased with jet velocity. The liftoff height in the hydrogen-assisted autoignition regime was dependent on the square of the adiabatic ignition delay time for the addition of small amounts of hydrogen, as was the case for pure methane jets. When the initial temperature was below 920 K, where the methane fuel did not show autoignition behavior, the flame was autoignited by the addition of hydrogen, which is an ignition improver. The liftoff height demonstrated a unique feature in that it decreased nonlinearly as the jet velocity increased. The differential diffusion of hydrogen is expected to play a crucial role in the decrease in the liftoff height with increasing jet velocity.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Combustion and Laser Diagnostics Laboratory
Publisher:
The Korean Society of Mechanical Engineers
Journal:
Transactions of the Korean Society of Mechanical Engineers B
Issue Date:
1-Jan-2012
DOI:
10.3795/ksme-b.2012.36.1.075
Type:
Article
ISSN:
12264881
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorChoin, Byung Chulen
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-08-03T09:43:36Zen
dc.date.available2015-08-03T09:43:36Zen
dc.date.issued2012-01-01en
dc.identifier.issn12264881en
dc.identifier.doi10.3795/ksme-b.2012.36.1.075en
dc.identifier.urihttp://hdl.handle.net/10754/562050en
dc.description.abstractAutoignited lifted flames in laminar jets with hydrogen-enriched methane fuels have been investigated experimentally in heated coflow air. The results showed that the autoignited lifted flame of the methane/hydrogen mixture, which had an initial temperature over 920 K, the threshold temperature for autoignition in methane jets, exhibited features typical of either a tribrachial edge or mild combustion depending on fuel mole fraction and the liftoff height increased with jet velocity. The liftoff height in the hydrogen-assisted autoignition regime was dependent on the square of the adiabatic ignition delay time for the addition of small amounts of hydrogen, as was the case for pure methane jets. When the initial temperature was below 920 K, where the methane fuel did not show autoignition behavior, the flame was autoignited by the addition of hydrogen, which is an ignition improver. The liftoff height demonstrated a unique feature in that it decreased nonlinearly as the jet velocity increased. The differential diffusion of hydrogen is expected to play a crucial role in the decrease in the liftoff height with increasing jet velocity.en
dc.publisherThe Korean Society of Mechanical Engineersen
dc.titleEffect of hydrogen addition on autoignited methane lifted flamesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentCombustion and Laser Diagnostics Laboratoryen
dc.identifier.journalTransactions of the Korean Society of Mechanical Engineers Ben
dc.contributor.institutionEnvironment and Plant Team, Korean Register of Shipping, South Koreaen
kaust.authorChung, Suk-Hoen
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