Naslov
A CFD Simulation of Turbulent Piloted Diffusion Flame with Modelling of Nitrogen Oxides Formation

Autori
Vujanović, Milan ; Baburić, Mario ; Duić, Neven ; Priesching, Peter ; Tatschl, Reinhard

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
CD Proceedings of 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics HEFAT2007, Sun City, South Africa / - , 2007

Skup
The 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics HEFAT2007

Mjesto i datum
Sun City, Južnoafrička republika, 01.07.2007. - 04.07.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
CFD; Turbulent Piloted Diffusion Flame; Nitrogen Oxides

Sažetak
This paper presents a numerical simulation of a turbulent piloted methane/air jet diffusion flame using computational fluid dynamics (CFD) software FIRETM. A joint solution of detailed CFD equations for turbulent flow, combined with nitrogen oxide (NO) reaction mechanisms was used for prediction of nitrogen oxides formation. The NO formation was predicted in a post-processing mode using converged solution of a pre-calculated flame structure. The formation of NO was attributed to two chemical kinetic processes: thermal NO mechanism formed by oxidation of atmospheric nitrogen in the high-temperature post-flame region of combustion system and prompt NO mechanism formed by chemical reactions between hydrocarbon fragments and atmospheric nitrogen in fuel-rich regions of the flames. The influences of turbulent fluctuations on the nitrogen pollutant reaction process were accounted for by integrating the instantaneous values of kinetic rates with respect to fluctuating temperature over presumed PDF. The predicted NO mass fractions are compared to results obtained by a Steady Laminar Flamelet Model (SLFM) and to experimental data.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA