Development of methods

Sooting jet flame

In order to apply advanced laser-based measurement techniques successfully in combustion research, the various techniques need to be specially adapted to the respective combustion conditions. The following measurement techniques based on different physical processes are being developed by the workgroup:

Rayleigh scattering (measurement of density distributions and temperatures derived from these)

Raman scattering (simultaneous measurement of the main species in reactive flows;

Coherent anti-Stokes Raman scattering (CARS) (temperature measurement, mainly using the nitrogen present in air-fed combustion, also under technically difficult boundary conditions)

Absorption spectroscopy (Measurement of species concentrations and temperatures)

Laser-induced fluorescence (LIF) (measurement of combustion-relevant minority species; 2D thermometry on the OH radical)

Laser-induced incandescence (LII) (measurement of soot volume fraction and soot particle size)

Particle image velocimetry (PIV) (measurement of flow velocity)

Simultaneous use of different measurement techniques (determining the interaction between flow and flame)

High-speed imaging (LIF and PIV) (species and velocity distributions with frame rates in the kilohertz range)

Laser-induced plasma spectroscopy (LIPS) (Measurement of elementary composition or minority species)

Phosphor thermometry (Determination of surface temperatures)