NEW NONINTRUSIVE LASER DIAGNOSTIC-TOOLS FOR DESIGN AND OPTIMIZATION OF TECHNICALLY APPLIED COMBUSTION SYSTEMS

The purpose of this paper is to present the latest developments of las er diagnostic techniques for the application in technically applied tu rbulent combustion systems (i. e. an oil spray flame burner from ''KOR TING HANNOVER AG'') as a tool for design and optimization purposes of furnaces and boilers. The advantages of those laser based nonintrusive measurement techniques over classical mechanical probes are multiple. The most important are: The nonintrusive character of laser diagnosti cs offers the possibility to investigate the combustion process withou t any disturbing effect on the occuring reactions and the actual flow field. Second the application of new pulsed powerful UV-lasers in comb ination with ''high-tech'' intensified CCD-camera technology yield ins tantaneous spatial information about the occurring processes as well a s temporal data. Third beside pure qualitative information about spati al distributions (OH. NO, O-2, liquid fuel, vapor phase fuel), turbule nce and temporally recurring structures also quantitative data about m olecular densities can be obtained. It will be shown that locally limi ted gas tracer seeding at different positions into the air stream insi de the mixing device and subsequent planar detection in the fuel/air m ixing area lead to very important information for optimization and des ign purposes.