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Radiation Heat Transfer in Combustion Chamber CFD Simulation

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In this project, the steady combustion of methane and air in a simple extended cubical combustion chamber considering radiation is investigated.

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

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Description

Problem description

In this project, the steady combustion of methane and air in a simple extended cubical combustion chamber is investigated. Radiation heat transfer must be taken into account since combustion chambers undergo extremely high temperatures. In this project, the mixture’s static temperature has a maximum value of 3500 k within the chamber. Methane and air enter the domain from inlets, in which methane is injected into the domain using only one inlet but airflow is injected using two inlets due to achieve an approximately uniform mixture of fuel and air. The mass flow rate of air and fuel entering the domain is equal to 0.00468 and 0.000205 kg/s. The chemical reaction between methane and air produces CO2 and H2O, and since the combustion is air-rich, oxygen and nitrogen are left unused at the end of the reaction.

Combustion Chamber Geometry and mesh

The fluid domain’s geometry is designed in Design Modeler, and the computational grid is generated using Ansys meshing. The mesh type is unstructured, and the element number is 384112.

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Combustion Chamber CFD Simulation

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is neglected.

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

Models (radiation)
Energy On
Viscous K-epsilon model RNG
Near wall treatment Standard wall treatment
Radiation Model Discrete ordinates (DO)
Energy iters per radiation iters 10
Species transport Model Species transport
Options Reactions (volumetric)
Diffusion energy source (on)
Mixture properties Methane-Air
Turbulence chemistry interaction Eddy dissipation
Materials (radiation)
Fluid Definition method Fluent Database
Material name CO2
Material name CH4
Material name N2
Material name O2
Material name H2O
Boundary conditions (radiation)
Inlet_air_outer Type Mass flow inlet
Mass flow rate 0.00281 kg/s
Species N2 (0.79)
O2 (0.21)
Thermal Temperature =300k
Inlet_air_inner Type Mass flow inlet
Mass flow rate 0.00187 kg/s
Species N2 (0.79)
O2 (0.21)
Thermal Temperature =300k
Inlet_fuel Type Mass flow inlet
Mass flow rate 0.000205 kg/s
CH4 (1)
Solver configurations (radiation)
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Green gauss node-based
Pressure Second order
Momentum Second order Upwind
K First order Upwind
Epsilon First order Upwind

Results and discussion

The mixture mass flow rate at the outlet is equal to 0.004885042 kg/s. The main combustion process takes place at the combustion chamber itself. This can be explicitly seen in the contour of temperature reaction heat, which shows that the maximum temperature gradient and maximum reaction heat are observed.

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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