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Gas Turbine Combustion Chamber CFD Simulation

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In this project, methane-air fuel mixture combustion inside a gas turbine combustion chamber is simulated.


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Gas turbine introduction

A gas turbine is a rotating machine that operates on the energy of combustion gases. Each gas turbine includes a compressor to compress the air, a combustion chamber to mix the air with the fuel and ignite this mixture, and a turbine to convert the energy of hot and compressed gases into mechanical energy. Part of the mechanical energy produced in the turbine is spent on turning the compressor itself, and the rest of the energy, depending on the application of the gas turbine, may spin the generator (turbo-generator), accelerate the air (turbojet and turbofan) or be used in other applications.

The fuel system in gas turbines is constantly changing and engineers and designers in the field of mechanical engineering have tried to improve this important part in gas turbines. The use of gas turbine injectors in the fueling section of gas turbines is one of the most important and at the same time efficient methods in this field.

Project description

In this project, methane-air fuel mixture combustion inside a gas turbine combustion chamber is simulated. Methane and oxygen are injected inside the combustion chamber with the velocity of 128.9304m/s and 12.0396m/s and the temperature of 286K and 109K, respectively. The fuel mixture is then ignited and energy and heat are generated. Energy model is activated. Also, the species transport model is used to analyze the combustion process.

Eddy-Dissipation method has been used to investigate the chemical-turbulent interaction of combustion reactants and the standard k-ε viscosity model with the use of standard wall functions is exploited to solve the fluid flow. The ideal gas equation has also been used to determine the water vapor’s density changes due to changes in temperature

Gas Turbine Geometry and Mesh

The geometry required for this analysis, which includes only the gas turbine injector part, is designed in ANSYS Design Modeler® and mesh inside ANSYS Meshing®. The mesh type used for this geometry is structured and the element number is 197006.

gas turbine gas turbine

CFD Simulation Settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity has not been taken into account.

The applied settings are summarized in the following table.

(gas turbine)Models
Viscous modelk-epsilon
k-epsilon modelstandard
near wall treatmentstandard wall function
SpeciesSpecies transport
Chemistry solverNone-explicit source
Mixture materialMethane-air
Turbulence chemistry interactionEddy-dissipation
(gas turbine)Boundary conditions
Inletvelocity inlet


Oxygen inlet

Velocity magnitude12.0396 m/s
Turbulent intensity1 %
Hydraulic diameter0.005715m
Temperature109 K
Species (mass fraction)O2 à 1


Methane inlet

Velocity magnitude128.9304 m/s
Turbulent intensity1 %
Hydraulic diameter0.0012192 m
Thermal286 K
Species (mass fraction)CH4 = 1
OutletPressure outlet
Gauge pressure0 Pa
(gas turbine)Turbulent intensity5 %
Hydraulic diameter0.012 m
Temperature286 K

ISO-thermal wall

wall motionstationary wall
Wall temperature286 K
Species (boundary condition)Zero diffusive flux

Adiabatic and rocket walls

wall motionstationary wall
Heat flux0 W/m2
Species (boundary condition)Zero diffusive flux
(gas turbine)Solution Methods
Formulation Implicit
Flux-type Roe-FDS
Spatial discretizationFlowsecond order upwind
turbulent kinetic energysecond order upwind
turbulent dissipation ratesecond order upwind
(gas turbine)Initialization
Initialization method Standard
gauge pressure0 Pa
Axial velocity52.48457 m/s
Radial velocity0 m/s
temperature200 K
Turbulent kinetic energy0.8769719 m2/s2
Turbulent dissipation rate2623.847 m2/s3
Other species0


Contours of density, pressure, temperature, velocity and species mass fractions are presented.


All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

This ANSYS Fluent project includes CFD simulation files and a training movie.


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