Luca Marchitto is a Senior Researcher for the Italian National Research Council where he has worked since 2006. Currently, he is affiliated with the Institute of Sciences and Technologies for Sustainable Energy and Mobility. His activity is mainly focused on the optimization of combustion processes in internal combustion engines, the fluid-dynamic characterization of sprays by direct injection, and combustion in internal combustion and spark ignition engines by nonintrusive techniques. Cinzia Tornatore is a Senior Researcher for the Italian National Research Council where she has worked since 2004. Currently, she is affiliated with the Institute of Sciences and Technologies for Sustainable Energy and Mobility. Her work is mostly focused on the study of thermo-fluid dynamic processes that take place in engines fueled with new-generation fuels. The research is carried out through the application of high-spatial and temporal resolution optical techniques.