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Non-Premixed Combustion CFD Simulation by ANSYS Fluent

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The present problem simulates non-premixed combustion using ANSYS Fluent software.

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

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Description

Non-Premixed Combustion Project Description

The present problem simulates non-premixed combustion using ANSYS Fluent software. In fact, a two-dimensional combustion chamber is designed in which air flow and fuel flow enter simultaneously from two different inlets with different flow rates. The combustion process occurs when some air is combined with some hydrocarbon fuel to convert fuel energy into heat energy. After the combustion process occurs, the products of chemical reactions leave the combustion chamber.

Through two separate and independent inlets, air flow (consisting of N2 with a mass fraction of 0.767 and O2 with a mass fraction of 0.233) with a temperature of 300 K and a flow rate of 1.19 kg.s-1 and fuel flow (consisting of CH4 with a mass fraction of 1 At a temperature of 300 K and a flow rate of 0.019 kg.s-1) enter the combustion chamber to combine the chemical reaction of combustion to occur. To model the combustion process and the chemical reaction of combustion in this numerical simulation, the Species Transport model has been used. The model of species transport in non-premixed combustion mode is also defined.

In this type of combustion, fuel and oxidizer enter the reaction zone of the combustion chamber through separate paths; They do not mix (premix) before fully entering the combustion chamber. In the non-premixed combustion model, the definition of a mixture fraction is used, which represents the mass fraction derived from the fuel flow. In other words, the mixture fraction is equivalent to the local mass fraction of fuel flow elements (such as C, H, etc.) in different gaseous species (such as CO2, H2O, O2, etc.).

Geometry & Mesh

The current model is designed in two dimensions using Design Modeler software. Since the model is symmetric, to reduce the computational cost, the model is drawn using the axismmetric method. A fuel injector boundary, an air inlet boundary, and a combustion chamber outlet are defined.

non-premixed

We carry out the model’s meshing using ANSYS Meshing software, and the mesh type is unstructured. The element number is 11202. The following figure shows the mesh.

non-premixed

Non-Premixed Combustion CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is ignored.

The following table represents a summary of the defining steps of the problem and its solution:

Models (non-premixed)
Viscous k-epsilon
k-epsilon model realizable
near wall treatment standard wall functions
Species Non-Premixed Combustion
state relation chemical equilibrium
Energy On
Boundary conditions (non-premixed)
Inlet – Air Mass Flow Inlet
mass flow rate 1.19 kg.s-1
temperature 300 K
mean mixture fraction 0
Inlet – Fuel Mass Flow Inlet
mass flow rate 0.019 kg.s-1
temperature 300 K
mean mixture fraction 1
Outlet Pressure Outlet
gauge pressure 0 pascal
mean mixture fraction 0
Inner & Outer Walls Wall
wall motion stationary wall
heat flux 0 W.m-2
Internal Walls Wall
wall motion stationary wall
thermal condition coupled
Methods (non-premixed)
Pressure-Velocity Coupling SIMPLE
Pressure standard
density first order upwind
momentum first order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
energy first order upwind
mean mixture fraction first order upwind
mixture fraction variance first order upwind
Initialization (non-premixed)
Initialization methods Standard
gauge pressure 0 Pascal
axial & radial velocity 0 m.s-1
temperature 292.78
mean mixture fraction 0

Results & Discussions

At the end of the solution process, two-dimensional contours related to pressure, temperature, velocity, density and mass fraction O2, CH4, H2O, CO2, N2, CO and C2H6 as well as two-dimensional path lines are obtained. The results show that as a result of the combustion reaction between the reactants (methane fuel and air flow), the products of the reaction such as CO, CO2, H2O, etc. are produced.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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