Kinetic Effects of Toluene Blending on n-Decane Diffusion Flame Extinction Limit

2009 ◽  
Author(s):  
Sang Hee Won ◽  
Wenting Sun ◽  
Yiguang Ju
Keyword(s):  
Diffusion Flame ◽  
Flame Extinction ◽  
Extinction Limit ◽  
Kinetic Effects

Kinetic effects of non-equilibrium plasma-assisted methane oxidation on diffusion flame extinction limits

2012 ◽  
Vol 159 (1) ◽  
pp. 221-229 ◽  
Author(s):  
Wenting Sun ◽  
Mruthunjaya Uddi ◽  
Sang Hee Won ◽  
Timothy Ombrello ◽  
Campbell Carter ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Diffusion Flame ◽  
Flame Extinction ◽  
Equilibrium Plasma ◽  
Kinetic Effects ◽  
Non Equilibrium

Kinetic effects of aromatic molecular structures on diffusion flame extinction

2011 ◽  
Vol 33 (1) ◽  
pp. 1163-1170 ◽  
Author(s):  
Sang Hee Won ◽  
Stephen Dooley ◽  
Frederick L. Dryer ◽  
Yiguang Ju
Keyword(s):  
Diffusion Flame ◽  
Molecular Structures ◽  
Flame Extinction ◽  
Kinetic Effects

Diffusion-flame extinction of liquid fuel at elevated pressures

1991 ◽  
Vol 86 (1-2) ◽  
pp. 171-178 ◽  
Author(s):  
Takashi Niioka ◽  
Susumu Hasegawa ◽  
Tatsuro Tsukamoto ◽  
Jun'ichi Sato
Keyword(s):  
Diffusion Flame ◽  
Liquid Fuel ◽  
Flame Extinction ◽  
Elevated Pressures

In-Situ O2 Sensor Demonstration in a Pressurized Lean Premixed Combustion Rig

2004 ◽  
Author(s):  
Douglas L. Straub ◽  
Jimmy D. Thornton ◽  
Geo. A. Richards ◽  
Doug Simmers ◽  
Pavel Shuk ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Oxygen Sensors ◽  
In Situ Monitoring ◽  
Sensor Technology ◽  
Excess Oxygen ◽  
Flame Extinction ◽  
Extinction Limit ◽  
Lean Premixed

State-of-the-art gas turbines engines continuously strive for higher cycle efficiencies and lower pollutant emissions. The gas turbine combustor is critical for achieving these goals, and operation near the lean extinction limit is necessary. Slight changes in the flow splits (fuel and/or air) can lead to unexpected flame extinction, or other operational issues such as combustion oscillations. Operating these gas turbine combustors near the flame extinction limit could be improved if acceptable in-situ sensors for the combustion section were commercially available. Although exhaust gas oxygen sensors are commonly used in other combustion processes including large utility boilers and automobiles, the use of in-situ oxygen sensors in gas turbine engines has been limited. This paper will describe the results from rig tests in a pressurized lean premixed combustor. The O2 sensor technology used in these tests is commercially available for industrial boiler applications which typically operate near atmospheric pressure and oxygen levels that range from 0–3% of the effluent. In modern gas turbines, however, the amount of excess oxygen is considerably higher. These high levels of excess oxygen result in low level signals from the O2 sensor, which creates concern for in-situ monitoring in gas turbines. The results indicate that this sensor technology will operate at elevated pressure and at high levels of excess oxygen in the process gas suggesting possible application as an operational and diagnostic tool. Data will be presented to show the effects of different operating variables such as pressure, inlet-air temperature, heat-release, and fuel-air ratio.

An Experimental Study on Methane/Oxygen-Air Combustion With a Rapidly Mixed Type Tubular Flame Burner

2011 ◽  
Author(s):  
Baolu Shi ◽  
Tatsuya Kowari ◽  
Daisuke Shimokuri ◽  
Satoru Ishizuka
Keyword(s):  
Experimental Study ◽  
Diffusion Flame ◽  
Turbulent Combustion ◽  
Mixed Type ◽  
Diffusion Flames ◽  
Kinetic Mechanism ◽  
Pure Oxygen ◽  
Extinction Limit ◽  
Wide Range ◽  
Flame Burner

Methane/oxygen-air combustion has been attempted by using a rapidly mixed type tubular flame burner with four slits, from two of which a fuel is injected and from another two an oxidizer is injected. The oxygen concentration (molar) in the oxygen-air oxidizer has been varied from 21% (air) to 100% (pure oxygen). Results show that uniform tubular flame combustion can be obtained for a wide range of equivalence ratios, if the oxygen molar concentration in the oxygen-air oxidizer is less than about 50%. Above 50%, however, very intense turbulent combustion occurs frequently and the circular-shaped tubular flame is deformed as oval-shaped for most equivalence ratios. The uniform tubular flame range is reduced and quite limited in the vicinity of lean condition. Detailed observations show that for pure (or near pure) oxygen oxidizer, two diffusion flames are established between the fuel and oxidizer streams at the exits of the fuel slits, which prevents fuel from mixing with oxygen, resulting in a violent turbulent combustion downstream the slits. With use of a burner with smaller slit width, however, formation of the diffusion flame is inhibited and a uniform tubular flame can be established, although still limited close to the lean extinction limit. To fully understand the flame characteristics above, the burning velocities are calculated for various equivalence ratios as well as for various oxygen concentrations in the oxygen-air oxidizer using the CHEMKIN PREMIX code with the GRI kinetic mechanism.

Sign in / Sign up

Export Citation Format

Share Document