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.
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.
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