Transported scalar PDF modeling of oxygen-enriched turbulent jet diffusion flames: Soot production and radiative heat transfer

Beside appropriate turbulence and combustion modeling, the problem of an accurate prediction of turbulent diffusion flames usually requires accurate radiative heat transfer predictions as well. In this paper it is shown that the inclusion of radiation modeling into the overall numerical simulation is important if accurate temperature profiles are needed. Two different jet diffusion flame configurations are simulated in this work — a diluted hydrogen jet flame (80% H2 and 20% He by volume) [1–4], and a piloted methane jet diffusion flame (flame D) [5, 6]. The predictions are compared to experimental data. Radiation is modeled by a conservative discrete transfer radiation method (DTRM) [7, 8]. Turbulence is modeled by a classical k-ε and by a hybrid procedure, as proposed in [9]. Combustion modeling is based on the stationary laminar flamelet model (SLFM) [10], where the combustion/turbulence interaction is accomplished via the presumed β probability density function (β-PDF).

Download Full-text

High fidelity radiative heat transfer models for high-pressure laminar hydrogen–air diffusion flames

Combustion Theory and Modelling ◽

10.1080/13647830.2014.959060 ◽

2014 ◽

Vol 18 (6) ◽

pp. 607-626 ◽

Cited By ~ 12

Author(s):

Jian Cai ◽

Shenghui Lei ◽

Adhiraj Dasgupta ◽

Michael F. Modest ◽

Daniel C. Haworth

Keyword(s):

Heat Transfer ◽

High Pressure ◽

Radiative Heat Transfer ◽

Radiative Heat ◽

Diffusion Flames ◽

High Fidelity ◽

Air Diffusion ◽

Transfer Models

Download Full-text

Heat Transfer to Pipes Submerged in Turbulent Jet Diffusion Flames

Heat Transfer in Radiating and Combusting Systems ◽

10.1007/978-3-642-84637-3_30 ◽

1991 ◽

pp. 474-490 ◽

Cited By ~ 6

Author(s):

J. E. Hustad ◽

O. K. Sonju

Keyword(s):

Heat Transfer ◽

Diffusion Flames ◽

Turbulent Jet ◽

Jet Diffusion Flames

Download Full-text

Radiative Heat Transfer in High-Pressure Laminar Hydrogen-Air Diffusion Flames Using Spherical Harmonics and K-Distributions

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D ◽

10.1115/imece2012-88507 ◽

2012 ◽

Author(s):

Jian Cai ◽

Shenghui Lei ◽

Adhiraj Dasgupta ◽

Michael F. Modest ◽

Dan C. Haworth

Keyword(s):

Heat Transfer ◽

High Pressure ◽

Water Vapor ◽

Spherical Harmonics ◽

Radiative Heat Transfer ◽

Radiative Heat ◽

Diffusion Flames ◽

Transport Equations ◽

Full Spectrum ◽

Air Jet

Radiative heat transfer is studied numerically for high-pressure laminar H2-air jet diffusion flames, with pressure ranging from 1 to 30 bar. Water vapor is assumed to be the only radiatively participating species. A full spectrum k-distribution spectral model is used. Narrowband k-distributions of water vapor are calculated and databased from the HITEMP 2010 database, which claims to retain accuracy up to 4000K. The full-spectrum k-distributions are assembled from their narrowband counterparts to yield high accuracy with little additional computational cost. The radiative transfer equation (RTE) is solved using various spherical harmonics methods, such as P1, simplified P3 (SP3) and simplified P5 (SP5). The resulting partial differential equations as well as other transport equations in the laminar diffusion flames are discretized with the finite-volume method in OpenFOAM. Differential diffusion effects which are important in laminar hydrogen flames are also included in the scalar transport equations. It was found that peak flame temperature becomes less sensitive to radiation at higher pressure, and that radiation causes cooling in the downstream region. Differences between the three spherical harmonics RTE solver were found negligible below 5 bar.

Download Full-text