Design and Modeling of a Porous Combustor

Project Info


Design and Modeling of a Porous Combustor


The methodology for combustion in a porous burner has many challenges that were resolved step by step:

  • This was the second design, which was modified based on a heat exchanger filled with two substances, water, and another liquid with lower heat capacity.
  • All of these quantities were to be visualized and the total heat loses by water and the second liquid was to be obtained from the CFD-results.
  • Calculation of the losses due to heat convection and conduction through the walls were also an issue to be taken into consideration.

Design Assumptions:

1- The burner is adiabatic without heat losses at the exit.

2- Potential catalytic effects of the high temperature solid are negligible.

3- The flow speed is sufficiently low that the process is isobaric.

4-The mixture gas is non-radiating.

Work done:

The project was fulfilled in a very professional way for providing the theoretical results and to match it with the practical information obtained on the ground.

  • The aim was to calculate the heat losses and physical quantities like temperature, velocity, and species profile.
  • The new 3D combustor model is sown in Figure below. It consisted of two porous ceramic cylinders stacked together and insulated around the circumference
  • Two different liquids are used in the heat exchanger. Primary heat exchanger with fluid and secondary heat exchanger with water as a working fluid and specific heat of 1484 and 4185.5 J/kgK respectively.

Results and Impact:
In this project, two different design models of porous burner have been analyzed.
Main outputs from the second CFD-analysis:
-Method development for combustion of a lean, premixed Methane/Air mixture in a porous burner with species transport model.
-Three-phase model, CH4/Air mixture, water and another liquid was used in the simulation.
-Total Heat Transfer – by two different Liquids, (primary and secondary heat exchanger) has been obtained from the CFD-simulation.
-Contours of the static temperature, pressure, velocity, species: CH4, CO, CO2, H2O, NO, and O2 are presented.
-CFD-simulation shows different pattern compared to first CFD-case.
-The results show that heat loses are different for the primary and secondary heat exchanger.
-CFD-analysis show good result for the combustion processes and calculated heat

Dody A.
December 31, 2017
Mechanical Engineering