CALCULATIONS OF RADIATIVE HEAT TRANSFER IN AN AXISYMMETRIC JET DIFFUSION FLAME AT ELEVATED PRESSURES USING DIFFERENT METHODS

2016 ◽  
Author(s):  
Huaqiang Chu ◽  
Jean-Louis Consalvi ◽  
Mingyan Gu ◽  
Fengshan Liu
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Diffusion Flame ◽  
Radiative Heat ◽  
Axisymmetric Jet ◽  
Elevated Pressures

Numerical Simulation of Jet Diffusion Flames With Radiative Heat Transfer Modeling

2005 ◽  
Author(s):  
Mario Baburic´ ◽  
Reinhard Tatschl ◽  
Neven Duic´
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Radiative Heat Transfer ◽  
Diffusion Flame ◽  
Radiative Heat ◽  
Diffusion Flames ◽  
Flamelet Model ◽  
Jet Flame ◽  
Combustion Modeling ◽  
Jet Diffusion Flames

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).

scholarly journals Effect of pressure broadening on the radiative heat transfer by CO and CH4 gases using line by line method with latest high-temperature database

2021 ◽  
pp. 319-319
Author(s):  
Yu Yang ◽  
Shu Zheng ◽  
Yuzhen He ◽  
Mingxin Xu ◽  
Zixue Luo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Absorption Coefficient ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Pressure Effect ◽  
Pressure Effects ◽  
Line Broadening ◽  
Pressure Broadening ◽  
Elevated Pressures

As the development of current propulsion technology such as gas turbine and rocket chamber moving to higher working pressure, the radiative parameters of fuel, such as CH4or CO, are required at elevated pressures, which in some cases are calculated without considering the pressure effect of line broadening. To investigate the pressure effect of line broadening on the radiative heat transfer, the radiative heat sources of a one-dimensional enclosure filled with CH4/CO and Planck mean absorption coefficients at elevated pressures were calculated using the statistical narrow band(SNB)and line by line (LBL)methods. The radiative parameters were conducted using high-temperature molecular spectroscopic(HITEMP)2019 (for CO) and HITEMP 2020 (for CH4) databases. The results showed that the pressure effect of line broadening on the calculations of radiative heat source of CH4can be ignored when HITEMP 2020 database was used. For CO medium, the pressure effect of line broadening was over 40% at 30 atm in all cases whichever methods and databases were used. The pressure broadening has a strong effect on the Planck mean absorption coefficient below 1000 K for CH4 and at the temperature of 500-900K for CO at 30 atm. The maximum pressure effects were 22% for CH4 and 18% for CO at 30 atm, which illustrated the pressure effect of line broadening needed to be taken into account in the calculation of Planck mean absorption coefficient.

scholarly journals Validation of Numerical Methods at a Confined Turbulent Natural Gas Diffusion Flame Considering Detailed Radiative Transfer

1998 ◽  
Author(s):  
Benedikt Ganz ◽  
Peter Schmittel ◽  
Rainer Koch ◽  
Sigmar Wittig
Keyword(s):  
Heat Transfer ◽  
Radiative Transfer ◽  
Flow Field ◽  
Radiative Heat Transfer ◽  
Diffusion Flame ◽  
Radiative Heat ◽  
Gas Diffusion ◽  
Reacting Flow ◽  
Spectral Radiation ◽  
Mechanical Methods

Radiation heat transfer in flames depends strongly on local quantities such as pressure, temperature and concentration of participating species. In the present study, 3D numerical calculations of radiative heat transfer together with the reacting flow field are compared to detailed measurements of the velocity, temperature and spectral radiation field of a model combustor. The geometry of the combustion chamber (dch = 0.5m), the flame configuration (type-II swirling, diffusion flame) and the highly turbulent flow conditions resemble the characteristics of industrial combustors. The concentrations of CO2, H2O, CO, CH4, NO, NOx, O2 and H2 as well as local mean temperatures and their fluctuations were recorded at 300 locations at 14 axial planes. The radiation intensity incident on the wall was measured spectrally and time resolved at 11 axial planes within the spectral range of 1.4 to 5.4 μm. For numerically solving the reacting flow field, spectral methods for calculating the radiative heat transfer were coupled to fluid mechanical methods for calculating the reacting flow. The agreement between numerical prediction and measurements for the reacting flow field as well as for the radiative heat transfer is reasonably good. The numerical computations show that radiative transfer is of major importance. The temperature in the hot reaction zone was found to be lowered by approximately 400 K by radiative losses.

Radiative heat transfer from a hydrogen diffusion flame at M=1

1974 ◽  
Vol 10 (5) ◽  
pp. 638-642
Author(s):  
M. G. Ktalkherman ◽  
I. A. Mogil'nyi ◽  
Ya. I. Kharitonova ◽  
V. S. Kholyavin ◽  
V. A. Yasakov
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Diffusion Flame ◽  
Radiative Heat ◽  
Hydrogen Diffusion
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