Comparison of the Numerical Models for the Temperature Distributions of Non-Premixed Swirling Methane Flame

Year 2019, Volume: 22 Issue: 4, 819 - 826, 01.12.2019

Güven Tunç , İlker Yılmaz

https://doi.org/10.2339/politeknik.448529

Cited By: 2

Abstract

This study aimed to investigate the numerical modelling parameters that are in good agreement with experimental data for the temperature distribution of a non-premixed swirling methane flame. All numerical calculations have been performed with FLUENT, a computational fluid dynamics code. P-1 radiation model has been chosen for all numerical calculations. In addition, the swirl number has been taken 0.4 value to validate the results with respect to reference experimental data. All comparisons have been performed in axial and radial temperature distributions according to experimental data. Firstly, the number of swirl has been defined as a user-defined function. Thus, the effect of defining user-defined functions has been examined in the swirl number. Secondly, the model constant (A) of the eddy dissipation combustion model has been investigated to determine suitable value. After that, the eddy dissipation and PDF mixture fraction combustion models have been compared with each other. Finally, k-ε standard, realizable and RNG models have been analyzed to determine the proper turbulence model. The results showed that to define the swirl number as a user-defined function in the comparison tests has not been an important effect to obtain good agreement with the experimental temperature distribution data. It has been found that the value of one for the Eddy dissipation model constant is suitable for this model. It has also been found that the experimental results in both combustion models give approximate results, but the PDF model is particularly better at axial temperature distribution. Moreover, it has been seen that the k-ε realizable turbulence model is more suitable for this model.

Keywords

User-defined function, numerical modelling, methane

Comparison of the Numerical Models for the Temperature Distributions of Non-Premixed Swirling Methane Flame

Abstract

This
study aimed to investigate the numerical modelling parameters that are
in good agreement with experimental data for the temperature
distribution of a non-premixed swirling methane flame. All numerical
calculations have been performed with FLUENT, a computational fluid
dynamics code. P-1 radiation model has been chosen for all numerical
calculations. In addition, the swirl number has been taken 0.4 value to
validate the results with respect to reference experimental data. All
comparisons have been performed in axial and radial temperature
distributions according to experimental data. Firstly, the number of swirl
has been defined as a user-defined function. Thus, the effect of
defining user-defined functions has been examined in the swirl number.
Secondly, the model constant (A) of the eddy dissipation combustion
model has been investigated to determine suitable value. After that, the
eddy dissipation and PDF mixture fraction combustion models have been
compared with each other. Finally, k-ε
standard, realizable and RNG models have been analyzed to determine the
proper turbulence model. The results showed that to define the swirl
number as a user-defined function in the comparison tests has not been
an important effect to obtain good agreement with the experimental
temperature distribution data. It has been found that the value of one
for the Eddy dissipation model constant is suitable for this model. It
has also been found that the experimental results in both combustion
models give approximate results, but the PDF model is particularly
better at axial temperature distribution. Moreover, it has been seen
that the k-ε realizable turbulence model is more suitable for this
model.

Keywords

User-defined function, numerical modelling, methane

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