INVESTIGATION OF THE TRANSIENT FLAME DEVELOPMENT USING A COMBINATION OF ADVANCED OPTICAL MEASUREMENT TECHNIQUES

The present paper deals with the investigation of various combustion processes by means of highly sophisticated optical measurement methods. Many optical techniques are capable of describing phenomena in thermofluid-dynamics, but only a limited number of process variables are obtained by each of these techniques. In order to develop and to validate computer codes simulating combustion phenomena, only the combination of several measurement techniques on comparable experiments leads to a satisfactory data base containing the most important process variables. The application of the high-speed Schlieren-technique, the Laser-Induced Predissociation Fluorescence, and the Laser-DopplerVelocimetry on comparable transient combustion processes in several test-facilities is shown within this paper. Emphasis is put on the determination of length-scales due to their importance regarding turbulent combustion.