Diesel Fuel in a Gas Turbine Combustion Chamber, ANSYS Fluent Training


The problem is simulating the combustion process of diesel fuel inside a combustion chamber of a gas turbine system.

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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Diesel Fuel Combustion in a Gas Turbine Combustion Chamber Project Description

The problem is simulating the combustion process of diesel fuel inside a combustion chamber of a gas turbine system by ANSYS Fluent software. The function of the combustion chamber is such that the airflow enters the chamber from the space around the chamber and then passes through a diffuser duct with blades, becomes disturbed, and enters the special combustion space in order to better mix with the fuel.

On the other hand, the fuel flow is injected into the space inside the chamber through a nozzle and is mixed with the gas flow, and as a result, the combustion process takes place. The fuel used in this process is diesel (C16H29), which reacts with airflow.

The present model includes a combustion reaction between fuel and air, which is as follows:

diesel fuel

According to the above combustion reaction equation, there are four species in the reaction, which include diesel, hydrogen, oxygen, and carbon. Therefore, the Species Transport model has been used to define gaseous species. Also, the volumetric reaction model has been used to define the reaction between these species.

Airflow enters the combustion chamber at a velocity of 3 m.s-1 and a temperature of 300 K, and diesel is sprayed into the interior of the chamber at a velocity of 4 m.s-1 and a temperature of 300 K.

The aim of the present study is to investigate the mass fraction of reactants and combustion reaction products.

Gas Turbine Combustion Chamber Geometry & Mesh

The present 3-D model is designed using Design Modeler software. To simplify the model, only part of the original model (cylinder) is drawn. The air enters the inner part of the chamber through a diffuser duct, including the blade, and the fuel inlet is through the small circular cross-section inside the chamber. The following figure shows a view of the geometry.

gas turbine

The meshing is done using ANSYS Meshing software. The mesh type is unstructured and has 348,8057 cells. The following figure shows a view of the mesh.

combustion chamber

CFD Simulation

Several assumptions have been used to simulate the present model:

  • The solver is a pressure-based.
  • The simulation is steady-state.
  • The effect of gravity has been ignored.

A summary of the steps for defining the model is shown in the following table:

Models (diesel fuel)
k-epsilon Viscous model
standard k-epsilon model
standard wall function near-wall treatment
Species transport Species model
volumetric reactions
C16H29, O2, CO2, H2O volumetric species
on Energy
Boundary conditions (diesel fuel)
Velocity inlet Inlet type
4 m.s-1 velocity magnitude air
300 K temperature
0.23 O2 mass fraction
0 C16H29, CO2, H2O mass fraction
3 m.s-1 velocity magnitude fuel
300 K temperature
1 C16H29 mass fraction
0 O2, CO2, H2O mass fraction
Pressure outlet Outlet type
0 Pa gauge pressure outlet
wall Walls type
stationary wall wall motion outer wall
0 W.m-2 heat flux
zero diffusive flux species boundary condition (C16H29, O2, CO2, H2O)
Solution Methods (diesel fuel)
coupled Pressure-velocity coupling
second-order pressure Spatial discretization
first-order upwind momentum
first-order upwind energy
first-order upwind turbulent kinetic energy
first-order upwind turbulent dissipation rate
first-order upwind C16H29
first-order upwind CO2
first-order upwind H2O
first-order upwind O2
Initialization (diesel fuel)
Hybrid Initialization method


At the end of the solution process, two-dimensional and three-dimensional contours of pressure, temperature, velocity, and mass fraction of diesel, oxygen, carbon dioxide, and water vapor were obtained.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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