In addition to the fundamental validation experiments for reaction kinetics at DLR-VT (laminar flame speeds, ignition delay times) speciation data provides an ambitious test case for reaction mechanism. For this purpose, a modern high temperature flow reactor is used for mass spectrometric studies of gas phase reactions at controlled conditions.
High diluted, cold reactants are fed premixed to the Reactor in order to suppress a self-sustaining combustion reaction while gas composition is determined by MBMS at the reactors exhaust. This composition can be used for validation and development of kinetic reaction models in combination with the known (measured) temperature and velocity profiles. Variation of the residence time (and the reaction rate) is realized by changing the reactor temperature. Temperatures up to 1800 K are applicable by three individually controlled temperature zones with this atmospheric pressure flow reactor. Detailed speciation data is obtained using the sensitive MBMS technique, providing in situ access to almost all chemical species involved in the combustion process, including highly reactive species such as radicals.
Besides the detailed investigation of novel fuels and fuel components, the superior range of operation conditions gives access to extraordinary combustion applications, which are typically not assessable by flame experiments. These include super rich conditions at high temperature important for gasification processes, or the peroxy chemistry governing the low temperature oxidation regime.