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Gas Turbine Combustion Chamber 2-D CFD Simulation

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

This product includes Mesh file and a Training Movie.

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Description

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 model k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Energy on
Species Species transport
Reactions Volumetric
Chemistry solver None-explicit source
Mixture material Methane-air
Turbulence chemistry interaction Eddy-dissipation
(gas turbine) Boundary conditions
Inlet velocity inlet
 

 

Oxygen inlet

Velocity magnitude 12.0396 m/s
Turbulent intensity 1 %
Hydraulic diameter 0.005715m
Temperature 109 K
Species (mass fraction) O2 à 1
 

 

Methane inlet

Velocity magnitude 128.9304 m/s
Turbulent intensity 1 %
Hydraulic diameter 0.0012192 m
Thermal 286 K
Species (mass fraction) CH4 = 1
Outlet Pressure outlet
Gauge pressure 0 Pa
(gas turbine) Turbulent intensity 5 %
Hydraulic diameter 0.012 m
Temperature 286 K
Walls
 

ISO-thermal wall

wall motion stationary wall
Wall temperature 286 K
Species (boundary condition) Zero diffusive flux
 

Adiabatic and rocket walls

wall motion stationary wall
Heat flux 0 W/m2
Species (boundary condition) Zero diffusive flux
(gas turbine) Solution Methods
Formulation   Implicit
Flux-type   Roe-FDS
Spatial discretization Flow second order upwind
turbulent kinetic energy second order upwind
turbulent dissipation rate second order upwind
(gas turbine) Initialization
Initialization method   Standard
gauge pressure 0 Pa
Axial velocity 52.48457 m/s
Radial velocity 0 m/s
temperature 200 K
Turbulent kinetic energy 0.8769719 m2/s2
Turbulent dissipation rate 2623.847 m2/s3
CH4 0.3460065
O2 0.6539935
Other species 0

Results

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

There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.

 

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