Combustion Technology

Combustion Technology

The research group „Combustion Technology” at the Institute of Thermal Engineering at the Technische Universität Bergakademie Freiberg is focusing on the experimental investigation and analysis as well as theoretical description of combustion technology topics.
On the one hand the work of the group is application oriented, e.g. development and investigation of burner systems for different applications. Here, a core competence is the investigation of combustion processes within porous media. On the other hand, the usage of modern measuring techniques allows a detailed investigation of combustion processes and flames; thereby a contribution to basic research can be performed.

The research focuses are:
•    Flame diagnostics:
In addition to numerous existing probe metrology methods and absorption techniques on the basis of gas sampling, there are optical spectroscopic measurement techniques available:
o    flame visualization by using chemiluminescence
o    laser induced fluorescence (LIF): temperature and species concentration measurements in flames
o    rayleigh and mie scattering
o    spectrometer
o    schlieren photography
Furthermore, a range of model burner systems are available:
o    flat flame burner (McKenna and Heat-Flux burner)
o    counter flow burner
o    constant volume bomb chamber
o    high pressure chamber systems for inverse diffusion flames (IDF)
•    Diagnostics of fluid flows carried out with the usage of the following techniques:
o    laser doppler anemometry (LDA)
o    phase doppler anemometry (PDA)
o    particle image velocimetry (PIV)
o    high speed cameras
•    Measurement of the laminar burning velocity of different gaseous (e.g. synthetic gas mixtures) and liquid fuels (e.g. ethanol) with the Heat-Flux burner method (atmospheric conditions) as well as the constant volume bomb method (high pressures).
•    Combustion within porous media: Application of porous media for thermal conversion of different fuels like hydrogen and ultra-lean gas mixtures, solvent based fuels, et cetera. Fundamental investigations of the combustion process within porous media.
•    Burner development:
o    development, characterisation and optimisation of burners (non-premixed, premixed, porous burners) for different applications, e.g. start and post combustion burners for high-temperature fuel cell systems.
o    modern test benches and measuring techniques (e.g. exhaust gas analyzers based on ND-IR, ND-UV, paramagnetic, FID, conductivity, gas chromatography, high-precision mass flow controllers).
•    Reformer development:
o    development, characterisation and optimisation of reformers (CPOX, TPOX) for the production of synthetic gas mixtures based on hydrocarbon fuels, e.g. fuel cell systems.
•    Soot characterisation:
o    measurement of soot particle size distributions in combustion processes using a Scanning Mobility Particle Sizer (SMPS, 3-1000 nm) and measurement of gaseous soot precursors by gas chromatography, e.g. soot investigations of thermal partial oxidation processes within porous media.
o    aerosol generator to generate mono-disperse aerosols.