Detailed investigation of NO mechanism in non-premixed oxy-fuel jet flames with CH4/H2 fuel blends

2018 ◽  
Vol 43 (17) ◽  
pp. 8534-8557 ◽  
Author(s):  
Xudong Jiang ◽  
Pengfei Li ◽  
Junjun Guo ◽  
Fan Hu ◽  
Feifei Wang ◽  
...  
Keyword(s):  
Author(s):  
Andrew R. Hutchins ◽  
James D. Kribs ◽  
Richard D. Muncey ◽  
Kevin M. Lyons

The aim of this investigation is to determine the effects of confinement on the stabilization of turbulent, lifted methane (CH4) jet flames. A confinement cylinder (stainless steel) separates the coflow from the ambient air and restricts excess room air from being entrained into the combustion chamber, and thus produces varying stabilization patterns. The experiments were executed using fully confined, semi-confined, and unconfined conditions, as well as by varying fuel flow rate and coflow velocity (ambient air flowing in the same direction as the fuel jet). Methane flames experience liftoff and blowout at well-known conditions for unconfined jets, however, it was determined that with semi-confined conditions the flame does not experience blowout. Instead of the conventional unconfined stabilization patterns, an intense, intermittent behavior of the flame was observed. This sporadic behavior of the flame, while under semi-confinement, was determined to be a result from the restricted oxidizer access as well as the asymmetrical boundary layer that forms due to the viewing window. While under full confinement the flame behaved in a similar method as while under no confinement (full ambient air access). The stable nature of the flame while fully confined lacked the expected change in leading edge fluctuations that normally occur in turbulent jet flames. These behaviors address the combustion chemistry (lack of oxygen), turbulent mixing, and heat release that combine to produce the observed phenomena.


1980 ◽  
Vol 22 (5-6) ◽  
pp. 211-216 ◽  
Author(s):  
TAKESHI KAWAMURA ◽  
KATSUO ASATO ◽  
TAMOTSU MAZAKI

2012 ◽  
Vol 159 (11) ◽  
pp. 3342-3352 ◽  
Author(s):  
Alexis Sevault ◽  
Matthew Dunn ◽  
Robert S. Barlow ◽  
Mario Ditaranto

Author(s):  
Greg Pucher ◽  
William Allan ◽  
Marc LaViolette ◽  
Pierre Poitras

Differences in exhaust emissions, smoke production, exhaust pattern factor, deposit buildup, and fuel nozzle spray characteristics for various blends of conventional commercial jet fuel (Jet A-1) with synthetic and biodiesel formulations were investigated. Three synthetic fuel formulations and four fatty acid methyl esters (FAMEs) were evaluated as such. The synthetic fuels were tested in both neat (100%) and 50% by volume blends with Jet A-1, while the FAME fuels were blended in 2% and 20% proportions. The combustion chamber sector rig, which houses a Rolls Royce T-56-A-15 combustion section, was utilized for emissions, deposits, and exhaust pattern factor evaluation. A combustion chamber exhaust plane traversing thermocouple rake was employed to generate two-dimensional temperature maps during operation. Following combustion testing, several combustion system components, including the combustion chamber, fuel nozzle, and igniter plug, were analyzed for relative levels of deposit buildup. A phase Doppler anemometry system was employed to determine differences in droplet size distributions, while an optical spray pattern analyzer was used to compare the spray pattern for the various fuel blends as they emerged from the T-56 nozzle.


2015 ◽  
Vol 97 (1) ◽  
pp. 231-262 ◽  
Author(s):  
Franziska Hunger ◽  
Meor F. Zulkifli ◽  
Benjamin A. O. Williams ◽  
Frank Beyrau ◽  
Christian Hasse
Keyword(s):  

Sign in / Sign up

Export Citation Format

Share Document