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Vortex Combustion Chamber CFD Simulation

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

 

This ANSYS Fluent project includes CFD simulation files and a training movie.

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

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. 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 modelstandard
 near-wall treatmentstandard wall function
Energy on
Species Species transport
 ReactionsVolumetric
 Chemistry solverNone-explicit source
 OptionDiffusion energy source
 Mixture materialMethane-air
 Turbulence chemistry interactionEddy-dissipation
NOx mode on
 PathwaysThermal NOx + Prompt NOx
 

Turbulence interaction mode

PDF modetemperature
PDF typebeta
Temperature variancetransported
Formation model parameters  
thermal[O] modelPartial equilibrium
PromptEquivalence ratio0.76
(vortex combustion chamber)Boundary conditions 
Inlet velocity inlet
 

 

Air inlet

Velocity magnitude50 m/s
Turbulent intensity1 %
Hydraulic diameter0.003 m
Thermal300 K
Species (mass fraction)O2 à 0.23
 

 

Fuel inlet

Velocity magnitude60 m/s
Turbulent intensity1 %
Hydraulic diameter0.001 m
Thermal300 K
Species (mass fraction)CH4 à 1
Outlet Pressure outlet
 Gauge pressure0 Pa
 Turbulent intensity0.5 %
 Hydraulic diameter0.015 m
 thermal300 K
 Species (mass fraction)O2 à 0.23
Walls  
 wall motionstationary wall
 Wall temperature300 K
 Species (boundary condition)Zero diffusive flux
(vortex combustion chamber)Solution Methods 
Pressure-velocity coupling SIMPLE
Spatial discretizationpressurestandard
momentumfirst-order upwind
energyfirst-order upwind
turbulent kinetic energyfirst-order upwind
turbulent dissipation ratefirst-order upwind
CH4first-order upwind
O2first-order upwind
CO2first-order upwind
H2Ofirst-order upwind
Pollutant NOfirst-order upwind
Temperature variancefirst-order upwind
(vortex combustion chamber)Initialization 
Initialization method Standard
 gauge pressure0 Pa
 velocity (x,y,z)0 m/s-1
 temperature300 K
 Temperature variance0
 Turbulent kinetic energy0.3865991 m2/s2
 Turbulent dissipation rate232.5339 m2/s3
 CH40.07029794
 O20.2138315
 Other species0

Results

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

 

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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