Prediction of turbulent Prandtl number in the methane-air combustion using a second-order turbulent scalar flux model

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ERSHADI ALI; RAJABI ZARGARABADI MEHRAN

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Journal: FUEL AND COMBUSTION Year:2019 | Volume:12 | Issue:2 Page(s): 31-48

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Title

Prediction of turbulent Prandtl number in the methane-air combustion using a second-order turbulent scalar flux model

Author(s)

ERSHADI ALI | RAJABI ZARGARABADI MEHRAN | Issue Writer Certificate

Keywords

Combustion modelingQ1

turbulent Prandtl numberQ1

algebraic turbulent flux modelsQ2

Abstract

The main objective of the present study is to estimate the turbulent Prandtl number in non-premixed combustion of methane-air. In this regard, a turbulent stream of non-premixed combustion in a stoichiometric condition, is numerically analyzed using the (Reynolds averaged Navier-Stokes) (RANS). For modeling the combustion, the Eddy Dissipation Model (EDM), Eddy Dissipation Concept (EDC) and Probability Density Function (PDF) have been applied. The k-ε Realizable model and Discreet Ordinate (DO) also was used for the turbulence modeling and radiation modeling, respectively. To the turbulent heat flux in the energy equation, second order algebraic model (GGDH and HOGGDH) with simple eddy diffusivity model has been applied. Comparing the results of the numerical model SED (with the turbulent Prandtl 0. 85) and second order models with available experimental data show that applying the SO Models significantly led to the modification of predicting the temperature distribution in the combustion chamber. Moreover the NO derived from SO models distribution model has a good agreement with available experimental data. Calculation of Prandtl number turbulence in the combustion chamber shows that the assumption of Prandtl number of 0. 85 is far from reality and based on GGDH model, Prt in different areas varies from 0. 2 to 1. 3. Finally, the Prandtl number of 0. 45 has been proposed for the non-premixed combustion of methane-air.

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APA: Copy

ERSHADI, ALI, & RAJABI ZARGARABADI, MEHRAN. (2019). Prediction of turbulent Prandtl number in the methane-air combustion using a second-order turbulent scalar flux model. FUEL AND COMBUSTION, 12(2 ), 31-48. SID. https://sid.ir/paper/138613/en

Vancouver: Copy

ERSHADI ALI, RAJABI ZARGARABADI MEHRAN. Prediction of turbulent Prandtl number in the methane-air combustion using a second-order turbulent scalar flux model. FUEL AND COMBUSTION[Internet]. 2019;12(2 ):31-48. Available from: https://sid.ir/paper/138613/en

IEEE: Copy

ALI ERSHADI, and MEHRAN RAJABI ZARGARABADI, “Prediction of turbulent Prandtl number in the methane-air combustion using a second-order turbulent scalar flux model,” FUEL AND COMBUSTION, vol. 12, no. 2 , pp. 31–48, 2019, [Online]. Available: https://sid.ir/paper/138613/en

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