Team

Motivation/Introduction:

To optimize and further develop modern combustion systems in technical surroundings such as gas turbines, power plants or internal combustion engines, detailed knowledge about the effects that drive their operating behavior is needed. Stationary combustion processes have been investigated in deep in the past, knowledge about the working mechanisms is more or less common. In contrast, unsteady phenomena such as flashback, flame propagation or blow-off are not yet completely understood. These processes influence combustion stability fundamentally hence experimental investigation is of big interest for research and development of turbo-machines, engines and industrial burners.

Since technical combustion system usually feature three-dimensional turbulent flow and the interaction of chemistry, fluid mechanics and thermodynamics, multiple parameters need to be measured to get a better understanding. High-speed laser diagnostics can help gathering this information in a minimal-intrusive way. Planar time-resolved or volumetric instantaneous methods have been established in the past years. Future objective is to combine these two to three-dimensional time-resolved measurement of multiple parameters such as flow field (velocity), species concentrations and temperature.

Method:

In a first step, a polygonal high-speed laser scanning mirror will be designed to allow for scanning frequencies up to 10 kHz. This mirror is supposed to extend planar measurement techniques such as PIV (Particle Image Velocimetry) or PLIF (Planar Laser Induced Fluorescence) to three-dimensionality by rapid laser beam deflection. To increase scanning rates and operability furthermore, the potential of electro-optical modulator as a beam deflector will be reviewed. Novel routines for data handling, visualization and analyzing are to be implemented.