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Combustion Chamber CFD Simulation

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Combustion is the process of a combination of one or more combustible substances such as hydrocarbons with an oxidizing substance such as oxygen.

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This product includes a CFD simulation and training files using ANSYS Fluent software.

To order your ANSYS Fluent project (CFD simulation and training), contact our experts via info@mr-cfd.com, online support, or WhatsApp.

Description

The assumption for Combustion Chamber CFD Simulation

There are several assumptions to solve the Combustion Chamber CFD Simulation:

  1. The simulation is transient
  2. The flow is Incompressible; hence, the solution is pressure-based.
  3. We consider the effect of Earth’s gravity on problem-solving.

Combustion Chamber CFD Simulation Procedure

Step 1: Geometry

The geometry of the present model is 3-D and Design Modeler software designs it. Inside the combustion chamber, there are three main parts, including the air inlet pipe, the burner section, and the outlet pipe. Inside the chamber, there is a thin wall with several cavities of varying dimensions. The primary small cavities for cooling the chamber wall by layering flow and the next big ones are to keep the flame in the middle of the chamber.

Step 2: Mesh

ANSYS Meshing software performs the meshing of the present model. The mesh type is unstructured. We use a triangular grid and the element number is 694928.

Step 3: Set-Up

Here is a summary of the steps to define and solve the problem in the table:

 (Model) (Combustion Chamber)
Turbulencek-epsilon
k-epsilonRNG
Standard wall function
species transport
Defined SpeciesO2, CO, CO2, CH4, N2, H2O (vapor)
Energy Equationon
 (boundary conditions) for combustion simulation
Inletmass flow inlet
Combustion SimulationInlet AirMass Flow0.02 kg.s-1
Temperature300 K
O2 mass fraction0.23
N2 mass fraction0.77
Inlet Fuelmass flow0.0006 m.s-1
temperature300 K
CH4 mass fraction1
O2 mass fraction0
N2 mass fraction0
OutletPressure outlet (Combustion Chamber)
Outlet AirRelative Pressure0 Pa
O2 mass fraction0.23
N2 mass fraction0
Wall B.CWall
Heat Flux0 (isolated)
Diffusezero
 Methods for combustion simulation
Coupled
DiscretizationmomentumSecond-order upwind
pressureSecond-order upwind
energySecond-order upwind
species transportSecond-order upwind
Turbulence kinetic energy equationsFirst-order upwind
Turbulence Waste Rate EquationsFirst-order upwind
 initialization for combustion simulation
Standard
temp300 K
O20.23
Species0

We apply the Standard Wall Function and K-epsilon RNG model for the turbulence equation since the flow inside the combustion chamber is relatively complex and the simulation is steady. We use the species Transport model and the species are O2, CO, CO2, CH4, N2, H2O (vapor) for this simulation.

(Combustion Chamber)

in this case, there are two steps for the reaction of methane burning with oxygen, with six species involved in the reaction, namely: methane, Oxygen, nitrogen, water vapor, carbon dioxide, and carbon monoxide. The air mass flow inlet is 0.02 kg.s-1  and inlet air temperature is equal to 300 k. Mass fractions are .23 and .77 for oxygen and nitrogen, respectively. The fuel is methane and its inlet temperature is 300 k, also the flow rate is 0.0006 m.s-1. Ultimately, the walls are insulated and the solver method is coupled.

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

 

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