Radiation Heat Transfer in Combustion Chamber CFD Simulation
In this project, the steady combustion of methane and air in a simple extended cubical combustion chamber considering radiation is investigated.
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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.
Combustion Chamber CFD Simulation
- 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.
|Near wall treatment||Standard wall treatment|
|Radiation||Model||Discrete ordinates (DO)|
|Energy iters per radiation iters||10|
|Species transport||Model||Species transport|
|Diffusion energy source (on)|
|Turbulence chemistry interaction||Eddy dissipation|
|Fluid||Definition method||Fluent Database|
|Boundary conditions (radiation)|
|Inlet_air_outer||Type||Mass flow inlet|
|Mass flow rate||0.00281 kg/s|
|Inlet_air_inner||Type||Mass flow inlet|
|Mass flow rate||0.00187 kg/s|
|Inlet_fuel||Type||Mass flow inlet|
|Mass flow rate||0.000205 kg/s|
|Solver configurations (radiation)|
|Spatial discretization||Gradient||Green gauss node-based|
|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.