ModelingTurbulent Combustion in a CO/H<sub>2</sub>Diffusion Flame Using Reaction Progress Variables

Kok, Jacobus B.W.; Louis, J.J.J.

doi:10.1080/00102209808935762

Cited by 10 publications

(12 citation statements)

References 6 publications

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“…The model is successful, when the mapping is allowed. As discussed in Kok and Louis (1998) this is the case in flames where ignition and heating to temperatures above 1000 K is fast. It can be observed that the ignition area, where the model is less accurate, in the premixed flame investigated here is less than 5 mm ( fig.…”

Section: =1 \P Pfi) P R (R) P S (S)p(t) DI Dr Dsdtmentioning

confidence: 99%

Chemical and Physical Processes of Combustion

Roberts¹

2000

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TITLE AND SUBTITLE Chemical and Physical Processes of Combustion REPORT TYPE AND DATES COVERED Final Report FUNDING NUMBERSDAAD19-99-1-0354 AUTHOR(S)William L. Roberts, principal investigator PERFORMING ORGANIZATION NAME(S) AND ADDRESS(bS)North Carolina State University Raleigh, NC 27695-7514 SPONSORING / MONITORING AGENCY NAMfc(S) AND ADDRESS(bS)U ABSTRACT (Maximum 200 words)Experts assembled in the field of combustion science in order to provide a forum for exchange of research results, foster interactions among research groups, and to speed technology transfer.The Eastern States Section of the Combustion Institute held its Fall Technical Meeting in Raleigh, NC in October 1999. It brought together researchers from ^ government, industry and academia. Combustion science is central to the Army s development of advanced gun, rocket and vehicle propulsion systems. BanquetThe Meeting Banquet will be held on Tuesday Evening at the Velvet Cloak Inn with a "no-host" reception starting at 6:00 pm and dinner being served at 7:00 pm. Lab TourA Tour of the Applied Energy Research Laboratory at North Carolina State University will be arranged starting at 1:30 pm on Wednesday, October 13. Transportation will be provided from the meeting hotels. A sign up sheet will be available during the meeting. Institute! We hope that you find the meeting productive and enjoyable. Our section's format consciously encourages presentation and discussion of new results, especially by promoting the participation of student presenters. Chemical and Physical Processes of CombustionIn addition to the technical program, we have also arranged for the traditional welcoming reception on Sunday night; a barbeque lunch (North Carolina BBQ!) and reception on Monday;and the traditional banquet. These events should help us maintain the collegial atmosphere that we value so much at our Fall Technical Meetings.We are grateful for local sponsorship of this meeting by North Carolina State University and for all the contributions of time, facilities, and other resources toward the success of this meeting.The 28th International Symposium on Combustion will be held on July 30-August 4, 2000, in Edinburgh, Scotland (http://www.efm.leeds.ac.uk/edin2000/). As in 1998, we will not have a 65.66. 67.68. 69. 70.71. The Department of Energy (DOE) has recognized the need to make significant improvements to the overall thermal efficiency of coal-burning plants, while decreasing their environmental impact. Of all the proposed options for future plants, the highest efficiencies are achieved by using Brayton cycles (gas turbines) rather than exclusive reliance on Rankine cycles (steam turbines). The DOE then initiated the research effort for a High Performance Power Generating System (HIPPS), which utilizes gas turbines but excludes all coal combustion products from the working fluid, thus avoiding the expense of hot gas cleanup and/or the corrosion of turbine blades by coal ash. The specific goals for the HIPPS program are shown in Table 1. • Based on 90% reduction of...

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Section: =1 \P Pfi) P R (R) P S (S)p(t) DI Dr Dsdtmentioning

confidence: 99%

Chemical and Physical Processes of Combustion

Roberts¹

2000

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“…In dealing with the well-known closure problem for modeling mean chemical reaction rates, the turbulent combustion models are largely classified as the presumed joint pdf methods (Janicka, 1982;Correa, 1984;Biagioli, 1997;Louis, 1997;Kok, 1998) and the pdf transport methods (Biagioli, 1997;Correa, 1994). In the presumed pdf methods, the mean chemical source terms and the ensemble-averaged properties of the reacting mixture are evaluated by convoluting the instantaneous properties with the assumed joint probability distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Biagioli (Biagioli, 1997) addressed the utilities of RPV model in comparison with the PDF transport model for bluff-body stabilized flames. Recently, Kok and Louis (Louis, 1997;Kok, 1998) improved the predicative capability of the RPV model for analyzing the syngas flames. This improved RPV model can account for the effect of the HO z and HzO z chemistry which is important for the lean mixtures and the moderate temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, their RPV model was extended to incorporate the non adiabatic flame conditions by introducing the enthalpy transport variable. Kok and Louis (Louis, 1997;Kok, 1998) applied their RPV model to analyze the syngas flame. However this modified RPV model has not been extensively validated against the benchmark cases with the detailed experimental data of the local flame properties.…”

Section: Introductionmentioning

confidence: 99%

“…The present study employs the improved RPV model (Louis, 1997;Kok, 1998) to predict the flame structure and pollutant formation of the H2/CO-air bluff-body stabilized flames for which detailed experimental data (Masri, 1996; Combustion data base) are available. The predicative capability of the RPV combustion model has been validated against the detailed experimental data involving the distribution of temperature, major species, radicals, and NO.…”

Section: Introductionmentioning

confidence: 99%

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Numerical modeling for the H2/CO bluff-body stabilized flames

Kim

Ahn

et al. 2000

KSME International Journal

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This study investigates the nonpremixed H 2/CO-air turbulent flames numerically. The turbulent combustion process is represented by a reaction progress variable model coupled with the presumed joint probability function. In the present study, the turbulent combustion model is applied to analyze the nonadiabatic flames by introducing additional variable in the transport equation of enthalpy and the radiative heat loss is calculated using a local, geometry independent model. Calculations are compared with experimental data in terms of temperature, and mass fraction of major species, radical, and NO. Numerical results indicate that the lower and higher fuel-jet velocity flames have the distinctly different flame structures and NO formation characteristics in the proximity of the outer core vortex zone. The present model correctly predicts the essential features of flame structure and the characteristics of NO formation in the bluff-body stabilized flames. The effects of nonequilibrium chemistry and radiative heat loss on the thermal NO formation are discussed in detail.

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