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Combustion Chamber CFD Simulation

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

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

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Description

Combustion

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)
Turbulence k-epsilone
مدل k-epsilon RNG
رفتار نزدیک دیواره Standard wall function
species transport
Defined Species O2 , CO , CO2 , CH4 , N2 , H2O (vapor)
Energy Equation on
 (boundry conditions) for combustion simulation
Inlet mass flow inlet
Combustion Simulation Inlet Air Mass Flow 0.02 kg.s-1
Temperature 300 K
O2 mass fraction 0.23
N2 mass fraction 0.77
Inlet Fuel mass flow 0.0006 m.s-1
temperature 300 K
CH4 mass fraction 1
O2 mass fraction 0
N2 mass fraction 0
Outlet Pressure outlet
Outlet Air Relative Pressure 0 Pa
O2 mass fraction 0.23
N2 mass fraction 0
Wall B.C Wall
Heat Flux 0 (isolated)
Diffuse zero
 Methods for combustion simulation
Coupled
Discretization momentum Second order upwind
pressure Second order upwind
energy Second order upwind
species transport Second order upwind
Turbulence kinetic energy equations First order upwind
Turbulence Waste Rate Equations First order upwind
 initialization for combustion simulation
Standard
temp 300 K
O2 0.23
Species 0

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.

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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