Fuel-adapted manipulation of nozzle-internal and external breakup mechanisms for molecularly-controlled mixture formation


Main objective of the proposed project is the design of fuel-adapted nozzles for each spraying device of a multiple-injection combustion system. Those nozzles will enable ideal starting conditions for a molecularly-controlled mixture formation and combustion (e.g. for pre-chamber injection, simultaneous dual-fuel injection etc.). A well-defined nozzle adaptation requires a fundamental understanding of the overall process chain: i) the influence of specific three-dimensional geometrical parameters on nozzle internal flow structures and subsequent jet breakup mechanisms and ii) the correlation between downstream mixture formation phenomena1 and selected primary breakup mechanisms2. Therefore, a holistic experimental analysis of the above process chain is essential, taking into account all relevant microscopic and macroscopic liquid flow phenomena inside and outside the nozzle. Central tool for this study will be an innovative transparent nozzle concept, which offers new possibilities for three-dimensional nozzle-flow manipulation under engine-relevant conditions and simultaneous investigation of nozzle-internal and external flow structures with highly-resolving laser-optical measurement techniques.