Predicting radiative heat fluxes from two buoyant turbulent diffusion flames from burning propane under cross wind

2020 ◽  
Author(s):  
Bo Li ◽  
Huaxian Wan ◽  
Long Ding ◽  
Jie Ji
Keyword(s):  
Turbulent Diffusion ◽  
Radiative Heat ◽  
Diffusion Flames ◽  
Heat Fluxes ◽  
Turbulent Diffusion Flames

Numerical Investigation of Soot Formation in Turbulent Diffusion Flames Using Moss-Brookes Model

2014 ◽  
Author(s):  
Mannedhar Reddy ◽  
Ashoke De
Keyword(s):  
Heat Transfer ◽  
Absorption Coefficient ◽  
Radiative Heat Transfer ◽  
Turbulent Diffusion ◽  
Radiative Heat ◽  
Diffusion Flames ◽  
Soot Formation ◽  
Effective Absorption Coefficient ◽  
Turbulent Diffusion Flames ◽  
Air Jet

In the present work, two different turbulent diffusion flames are investigated for soot predictions using the presumed shape multi-environment Eulerian PDF (EPDF) as turbulence-chemistry closure. In this approach, the chemical equation is represented by multiple reactive scalars and finite number of Delta functions are used to describe the shape of joint composition PDF, while the truncated series expansion in spherical harmonics (P1 approximation) is used to solve the radiative heat-transfer equation. The absorption coefficient is modeled using the weighted sum of gray gases model (WSGG) considering four fictitious gases. The soot volume fraction is predicted using acetylene based soot inception model (Moss-Brookes model). The model accounts for inception, surface growth and oxidation processes of soot. An equilibrium based approach is used to determine the OH radical concentration, required for soot oxidation. A single variable PDF in terms of temperature is used to include the turbulence-chemistry effects on soot. An effective absorption coefficient is calculated to include the influence of radiative heat transfer on soot. The combined tool is used to determine the soot formation in two hydrocarbon flames (Delft flame III, pilot stabilized natural gas flame and an unconfined C2H4/air jet flame). The soot formation rate decreases with the inclusion of radiation for both the flames and indicate the need for delineation of radiative heat transfer. The effects of soot-turbulence interaction are consistent with available literature. The effect of collision efficiency on oxidation rate can be clearly explicated from the predictions of C2H4/air flame.

Predicting heat fluxes received by horizontal targets from two buoyant turbulent diffusion flames of propane burning in still air

2018 ◽  
Vol 190 ◽  
pp. 260-269 ◽  
Author(s):  
Huaxian Wan ◽  
Zihe Gao ◽  
Jie Ji ◽  
Jinhua Sun ◽  
Yongming Zhang ◽  
...  
Keyword(s):  
Turbulent Diffusion ◽  
Diffusion Flames ◽  
Heat Fluxes ◽  
Turbulent Diffusion Flames

Effects of Inert Placement (Zst) on Soot and Radiative Heat Flux in Turbulent Diffusion Flames

2017 ◽  
Vol 31 (7) ◽  
pp. 7617-7623 ◽  
Author(s):  
Akshay Gopan ◽  
Zhiwei Yang ◽  
Benjamin M. Kumfer ◽  
Richard L. Axelbaum
Keyword(s):  
Heat Flux ◽  
Turbulent Diffusion ◽  
Radiative Heat ◽  
Diffusion Flames ◽  
Radiative Heat Flux ◽  
Turbulent Diffusion Flames

Soot formation in ducted turbulent diffusion flames

AIAA Journal ◽  
1991 ◽  
Vol 29 (6) ◽  
pp. 932-935 ◽  
Author(s):  
T. Neill ◽  
I. M. Kennedy
Keyword(s):  
Turbulent Diffusion ◽  
Diffusion Flames ◽  
Soot Formation ◽  
Turbulent Diffusion Flames

Density Variations Effects in Turbulent Diffusion Flames: Modeling Of Unresolved Fluxes

2014 ◽  
Vol 186 (10-11) ◽  
pp. 1370-1391 ◽  
Author(s):  
Sylvain Serra ◽  
Vincent Robin ◽  
Arnaud Mura ◽  
Michel Champion
Keyword(s):  
Turbulent Diffusion ◽  
Diffusion Flames ◽  
Turbulent Diffusion Flames
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