Vortex Flame Combustion Chamber with 4 Methane and Air inlets
The present problem simulates the vortex flame inside a combustion chamber using ANSYS Fluent software.
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The present problem simulates the vortex flame inside a combustion chamber using ANSYS Fluent software. The combustion chamber has a cylindrical structure. The reactants, including fuel flow and air flow, enter the combustion chamber separately from four different inlet sections from the upper part. The products resulting from the reaction leave from the bottom part of the combustion chamber. The airflow enters the chamber in a radial direction from four inlet sections with angles of 90-degrees relative to each other located on the outer circumference of the combustion chamber; While the flow of methane gas as fuel from the other four inlets is sprayed directly into the interior of the combustion chamber.
To define the chemical reaction between air and methane, the species transport model has been used, and this chemical reaction consists of five different species, including O2, N2, CH4, CO2, and H2O. The airflow consists of 0.23 oxygen with a flow rate of 0.001135845 kg.s-1 and a temperature of 300 K enter the combustion chamber, and the fuel flow enters the combustion chamber with a flow rate of 0.0000645kg.s-1 and a temperature of 300 K at the same time. It is also assumed that the outer wall of the combustion chamber has a convection heat transfer with the free stream of its surroundings; Thus, the ambient temperature is equal to 300 K, and the heat transfer coefficient is equal to 25 W.m-2.K-1.
Combustion Chamber Geometry & Mesh
The present model is designed in three dimensions using Design Modeler software. The model is a cylindrical combustion chamber. Four inlet sections for airflow are defined radially around the combustion chamber, and four inlet sections for fuel flow are defined axially at the top of the chamber. One outlet section for combustion reaction products is determined at the bottom of the combustion chamber.
We carry out the model’s meshing using ANSYS Meshing software, and the mesh type is unstructured. The element number is 725521. The following figure shows the mesh.
Vortex Flame 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:
|near wall treatment||standard wall functions|
|number of volumetric species||5 (CH4, O2, CO2, H2O, N2)|
|4 Inlet – Air||Mass Flow Inlet|
|mass flow rate||0.001135845 kg.s-1|
|O2 mass fraction||0.23|
|4 Inlet – Fuel||Mass Flow Inlet|
|mass flow rate||0.0000645 kg.s-1|
|CH4 mass fraction||1|
|Outlet – Products||Pressure Outlet|
|gauge pressure||0 pascal|
|wall motion||stationary wall|
|heat transfer coefficient||25 W.m-2.K-1|
|free stream temperature||300 K|
|momentum||second order upwind|
|turbulent kinetic energy||first order upwind|
|turbulent dissipation rate||first order upwind|
|energy||second order upwind|
|all species||second order upwind|
Results & Discussions
At the end of the solution process, two-dimensional and three-dimensional contours related to pressure, temperature, velocity, and mass fraction O2, CH4, H2O, CO2, and N2 are obtained. The contours show that when the combustion reaction occurs between the fuel and the air, the temperature increases near the inlet sections of the chamber. Also, due to the chemical reaction of combustion, the volume fraction of methane fuel is reduced, and the volume fraction of reaction products such as CO2 and H2O is increased.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.