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Reduced Methane Combustion Mechanism and Verification, Validation, and Accreditation (VV&A) in CFD for NO Emission Prediction

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Abstract

In order to obtain a reduced methane combustion mechanism for predicting combustion field and pollutants accurately in CFD simulations with a lower computational cost, a reduced mechanism with 22 species and 65 steps of reactions from GRI-Mech 3.0 was obtained by direct relation graph method and sensitivity analysis. The ideal reactor calculation and VV&A (Verification, Validation, and Accreditation) in CFD were carried out using the proposed mechanism. The results showed that the proposed mechanism agrees well with the detailed mechanism in a wide range of operating conditions; the temperature field and species can be predicted accurately in CFD simulations (RANS and LES models), and the NO prediction error of an industrial gas turbine combustor outlet is less than 2×10−6. The proposed mechanism has high engineering values.

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Abbreviations

C :

the progress variable

D i,m :

the mass diffusion coefficient/m2×s−1

D T,i :

the thermal diffusion coefficient/m−2×s−1

\({\vec J_i}\) :

the diffusion flux

k :

turbulence kinetic energy/m−2×s−2

p :

pressure/Pa

R ab :

the immediate error

\({\overline S _{ij}}\) :

the rate-of-strain tensor

S Ct :

the Schmidt number

t :

time/s

U :

speed/m×s−1

Y :

mass fraction

α :

model parameter

δ ij :

kronecker delta

ε :

the dissipation rate/m2×s−3

μ :

the dynamic viscosity/Pa×s

μ t :

the turbulent viscosity

ν :

the kinematic viscosity/m2×s−1

ξ :

the fine scales

ρ :

density/kg×m−3

τ :

the time scale

τ ij :

the sub grid-scale stress

ϕ :

variable

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Acknowledgement

This work was supported by National Science and Technology Major Project (2017-III-0006-0031) and Fundamental Research Funds for the Central Universities (3072019CFJ0307). The computational time at Harbin Engineering University Supercomputing Service is gratefully acknowledged.

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Authors and Affiliations

  1. College of Power and Energy Engineering, Harbin Engineering University, Nantong, 150001, China

    Jihao Sun, Zhihao Zhang, Xiao Liu & Hongtao Zheng

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  1. Jihao Sun
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  2. Zhihao Zhang
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  4. Hongtao Zheng
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Correspondence to Xiao Liu.

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Sun, J., Zhang, Z., Liu, X. et al. Reduced Methane Combustion Mechanism and Verification, Validation, and Accreditation (VV&A) in CFD for NO Emission Prediction. J. Therm. Sci. 30, 610–623 (2021). https://doi.org/10.1007/s11630-020-1321-3

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  • DOI: https://doi.org/10.1007/s11630-020-1321-3

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