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Vortex Combustion Chamber CFD Simulation, ANSYS Fluent Training

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In this project, a combustion reaction is simulated inside a vortex combustion chamber.

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

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Description

Introduction

Combustion is the result of a chemical process between combustible material and an oxidizing agent that is associated with the production of heat and the chemical change of raw materials in a combustion chamber. Heat can be released by producing light in the form of a flame or a glow. Fossil fuels are usually made of organic compounds in the form of gases, liquids, or solids.

As mentioned above, burning is a type of oxidation reaction. However, due to the high speed of the combustion reaction, which leads to the production of a high amount of heat in a short time, and the increase in the ambient temperature, and the creation of light and flame, it falls into a special category.

The vortex combustion chamber is a new generation of liquid fuel internal combustion engines in which, a whirlpool flow is created with a different arrangement of injectors. This whirlpool helps to cool and increase the mixing of propulsion components in the combustion chamber, and complete combustion can be reached in a smaller volume chambers.

Vortex Combustion Chamber Project description

In this project, a combustion reaction is simulated inside a vortex combustion chamber by ANSYS Fluent software. The energy equation is activated. K-epsilon Standard viscosity model is used to analyze the turbulence of the two-phase current and standard wall function is exploited for the regions near to the walls. The species transport model is used to analyze the combustion process.

A mixture of air and methane is used as the fuel mixture. Eddy-Dissipation method has been used to investigate the chemical-turbulent interaction of combustion reactants and the NOx anticipation model is activated and the Temperature method is used for Turbulence Interaction mode. The ideal gas equation has also been used to determine the density changes due to changes in temperature.

Vortex Combustion Chamber Geometry and mesh

The geometry of this project is designed and meshed inside GAMBIT®. The mesh type used for this geometry is unstructured and the total element number is 379535 cells.

The following figure shows the geometry of the modeled vortex combustion chamber.

vortex

The following figure shows the computational mesh schematic for the modeled vortex combustion chamber

vortex

 

CFD simulation

The key assumptions considered in this project are:

  • Simulation is done using a pressure-based solver.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity has not been taken into account.

The applied settings are recapitulated in the following table.

Settings Table

 
(vortex combustion chamber) Models
Viscous model k-epsilon
k-epsilon model standard
near-wall treatment standard wall function
Energy on
Species Species transport
Reactions Volumetric
Chemistry solver None-explicit source
Option Diffusion energy source
Mixture material Methane-air
Turbulence chemistry interaction Eddy-dissipation
NOx mode on
Pathways Thermal NOx + Prompt NOx
 

Turbulence interaction mode

PDF mode temperature
PDF type beta
Temperature variance transported
Formation model parameters
thermal [O] model Partial equilibrium
Prompt Equivalence ratio 0.76
(vortex combustion chamber) Boundary conditions
Inlet velocity inlet
 

 

Air inlet

Velocity magnitude 50 m/s
Turbulent intensity 1 %
Hydraulic diameter 0.003 m
Thermal 300 K
Species (mass fraction) O2 à 0.23
 

 

Fuel inlet

Velocity magnitude 60 m/s
Turbulent intensity 1 %
Hydraulic diameter 0.001 m
Thermal 300 K
Species (mass fraction) CH4 à 1
Outlet Pressure outlet
Gauge pressure 0 Pa
Turbulent intensity 0.5 %
Hydraulic diameter 0.015 m
thermal 300 K
Species (mass fraction) O2 à 0.23
Walls
wall motion stationary wall
Wall temperature 300 K
Species (boundary condition) Zero diffusive flux
(vortex combustion chamber) Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization pressure standard
momentum first-order upwind
energy first-order upwind
turbulent kinetic energy first-order upwind
turbulent dissipation rate first-order upwind
CH4 first-order upwind
O2 first-order upwind
CO2 first-order upwind
H2O first-order upwind
Pollutant NO first-order upwind
Temperature variance first-order upwind
(vortex combustion chamber) Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) 0 m/s-1
temperature 300 K
Temperature variance 0
Turbulent kinetic energy 0.3865991 m2/s2
Turbulent dissipation rate 232.5339 m2/s3
CH4 0.07029794
O2 0.2138315
Other species 0

Results

Different contours of velocity, pressure, temperature, species mass fraction, etc. are presented in 3D and 2D.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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