1. JEECS
  2. All Volumes and Issues
  3. Volume 10, Number 2, 2024
  4. High-Fidelity RANS CFD Simulations of Physicochemical Process of Combustion in Gas Turbine Combustion Chambers in ANSYS CFX

High-Fidelity RANS CFD Simulations of Physicochemical Process of Combustion in Gas Turbine Combustion Chambers in ANSYS CFX

JEECS.
2024;
Volume 10, Number 2
: pp. 81 – 95
https://doi.org/10.23939/jeecs2024.02.081
Received: October 02, 2024
Revised: October 30, 2024
Accepted: November 06, 2024

M. Hajivand. High-fidelity RANS CFD simulations of physico-chemical process of combustion in gas turbine combustion chambers in ANSYS CFX. Energy Engineering and Control Systems, 2024, Vol. 10, No. 2, pp. 81 – 95. https://doi.org/10.23939/jeecs2024.02.081

Authors:
  1. Masoud Hajivand
1
National Aerospace University «Kharkiv Aviation Institute»

This study examines the validation and precision of essential parameters, including temperature distribution and nitrogen oxide (NOx) emissions, at the outlet of a gas turbine combustion chamber through high-fidelity Reynolds-Averaged Navier-Stokes (RANS) CFD simulations. The propane(C3H8)-air combustion process is modeled in ANSYS CFX utilizing three various turbulence models, including standard k-ε, RNG k-ε, and shear stress transport (SST), beside various combustion models such as the Eddy Dissipation Model (EDM), a hybrid of Eddy Dissipation and Finite Rate Chemistry (EDM/FRC), and the Flamelet model, including the P-1 model of radiation. A thorough sensitivity analysis was performed utilizing fine, medium, and coarse unstructured computational meshes to improve the reliability and accuracy of the results. The obtained CFD results showed that for outlet temperature, the standard k-ε turbulence model coupled with the Flamelet combustion model yields a mean deviation of -6.8%, while k-ε coupled with EDM yields a mean deviation of -9.9%. It also gave the lowest deviation of NOx emissions at combustor outlet equal to 2.3% when EDM/FRC combustion model was used in tandem with SST turbulence model. While the same combustion model coupled with the standard k-ε and RNG k-ε turbulence models exhibited a higher mean deviation of 13.6% and 15.4%, respectively, in predicting NOx emissions.

combustion
emission
CFD
turbulence
Flamelet model
validation
eddy dissipation
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