In-cylinder OH and CO2 detection in SI engine through UV natural emission spectroscopy

Processes of the combustion of liquid fuels and solid are more complex than combustion of fuel gases. With reference to liquid fuels occur additionally processes of vaporization of the fuel, and with reference to solid fuels-decomposition of the solid phase with processes of melting and vaporization, pyrolysis or gasification. This silultaneous and also different influence of different parameters is sometimes a reason of incorrect interpretation of experimental results. The study of the theoretical model of the combustion process concerning of liquid and solid fuels and which then the model takes into account also the gas-phase, because combustion processes takes in this phase, and occurs the interaction of the phase gas-liquid or the solid one. The theoretical model is presented basing on experimental initial researches realized in a model with reference to liquid fuels and solid ones. Researches realized in the constant volume chamber with measurements of the pressure during the process of the combustion with the use of quick photography and with measurement of the distribution of the velocity in the spray of the fuel and dropet measurements by means the laser Doppler equipment LDV and PDPA. There were obtained a good agreement of findings experimental researches with the theoretical model. Generally, on the common velocity of liquid fuels and solid one significant infleunce has a kind (laminar, temporary and turbolent) and the thickness of the thermal boundary layer.