... for stationary power generation. However, there are gaps in the fundamental understand of syngas combustion characteristics, especially at elevated pressures that are relevant to practical combustors. In this work, constant volume spherical expanding flames of three typical syngas compositions resulting from...

...N. J. Moore; S. D. Terry; K. M. Lyons Presented are the results of experiments designed to investigate flame lift-off behavior in the hysteresis regime for low Reynolds number turbulent flows. The hysteresis regime refers to the situation where the jet flame has dual positions favorable to flame...

... utilized to construct modified Arrhenius rate expressions for bimolecular reactions. C 7 H 14 O 2 was selected as a surrogate for the C 14 fuel in order to study the bimolecular reactions with flame radicals. In the present work, reactions of carbon numbers 4 and 5 of C 7 H 14 O 2 , where carbon number 1...

... carbon compounds chemically reactive flow flames gas mixtures hydrogen laminar flow nitrogen syngas syngas burning velocity Some of the critical key technology goals for the U.S. Department of Energy’s advanced power plant program are to attain NO x emission below 2 ppm...

..., thereby resulting in distributed ignition at multiple spatial locations, followed by lean combustion of the higher octane natural gas fuel via localized flame propagation. The multiple ignition centers result in faster combustion rates and higher fuel conversion efficiencies. The lean combustion...

...; therefore, the effects of porous material parameters have been less considered. In this research, the effects of geometrical parameters of porous medium, namely porosity and permeability, on centerline temperature distributions, peak flame temperature, flame structure, and gas mixture preheating have been...

...S. D. Terry; K. M. Lyons A study of the characteristics of turbulent lifted-jet flames in the hysteresis regime was performed using methane and ethylene fuels in laminar and turbulent air coflows. Reattachment velocities and lifted flame heights just prior to reattachment vary linearly...

...Tracy Smith; Chendhil Periasamy; Benjamin Baird; S. R. Gollahalli Relative effects of buoyancy and momentum on the characteristics of horizontally oriented circular (Circ) and elliptic (E) burner flames in a quiescent environment over a wide range of jet exit velocities are presented. The major...

... for predicting the radiation heat transfer. The numerical predictions allowed the determination of the flame patterns, species concentration distribution, temperature and velocity fields. This kind of analysis can be a powerful tool for evaluating design options such as the type, number and positioning...

.... The study did not attempt to increase turbulence using devices such as mesh screens or attempt to stabilize the flame. The results from a representative sample of 76 tests, from the 5,000+ tests that have been completed, are discussed herein. Typical pressure and temperature responses are presented...

...S. R. Gollahalli, Fellow ASME; D. Pardiwalla This study was directed to understand the coupling effects of the noncircular geometry of the burner and a crossflow on the combustion of gas jets. This paper compares the characteristics of turbulent propane jet flames from circular (diameter=0.45 cm...

...K. M. Lyons; K. A. Watson Results are presented on the formation of a diffusion flame in a methane nonpremixed jet following the propagation of partially premixed combustion. An initially nonreacting turbulent methane jet (Re=2700) in quiescent air is ignited at a downstream location x / d = 70...

...Azfar Kamal; S. R. Gollahalli, Fellow ASME An investigation of the effects of burner exit Reynolds number on the relative effects of burner geometry (circular and elliptic with an aspect ratio 2:4) in a propane jet flame is presented. Circular and elliptic burners of the equivalent area...

...Ala R. Qubbaj, Mem. ASME; S. R. Gollahalli, Fellow ASME Venturi-cascading is a technique to control pollutant emissions from diffusion flames by modifying air infusion and fuel-air mixing rates through changing the flow dynamics in the combustion zone with a set of venturis surrounding the flame...

... recirculation not only reduces nitric oxides emissions and increases convective heat transfer rates, but reduces local flame temperatures such that the flames become almost invisible for a human eye. This combustion regime is called flameless oxidation. Gasunie’s interest in this technique of flameless...

... coal flames. The effects of radiant heat transfer were strong for intermediate-size particles (37–74 μm). Ignition temperature was examined analytically by using a modified distributed activation energy model for pyrolysis. The calculated results agreed with experimental ones obtained from both...

... and breakup of the earlobe-shaped flame front along the outline of a pair of large-scale eddies of fresh mixture. Contributed by the Fuels and Combustion Technologies Division and presented at the 2nd International Symposium on Advanced Energy Conversion Systems and Related Technologies, Nagoya, Japan...

... on a cordierite honeycomb monolith. Catalytic combustion phenomena were categorized in three typical states: (a) state of partial reaction in the catalytic monolith, (b) state of homogeneous reaction in the monolith, (c) state of homogeneous reaction with a blue flame supposed on the monolith. A parabolic shape...

...Atsushi Makino Relevant to the self-propagating high-temperature synthesis (SHS) process, an analytical study has been made to investigate dependence of its flame initiation on system parameters, such as operating and physicochemical parameters, in order to obtain ignition energy. Use has been made...

...R. F. Huang; C. L. Lin The velocity fields of nonpremixed circular-disk stabilized flames are measured by a two-component laser Doppler velocimeter. The results are presented in different flow regimes: prepenetration, penetration, and large shear flow. The velocity-vector fields, streamline...