Akademik Veri Yönetim Sistemi
16th International Combustion Symposium (INCOS2022), Aydın, Türkiye, 8 - 11 Eylül 2022, ss.45-50
The deposits, which are called coking/soot and formed in the nozzle/hole structure of the common rail high pressure injection system injector nozzles used in diesel engines, have a significant effect on the hydraulic characteristics of the nozzle and the spray characteristics in the combustion chamber throughout the working life of the component. For this reason, it is important to examine the relationship between deposit formation in the injector nozzle and nozzle hole geometry in terms of internal combustion engine performance parameters. In this direction, to examine the effect of nozzle hole geometry, injector nozzles with 4 different nozzle hole geometries were designed. First the flow characteristics were simulated via using CFD techniques. Then these nozzles are manufactured and tested under accelerated test conditions. As a result of the study, it was observed that increased coking caused a decrease in the amount of injector spray/fuel as expected. It has been determined that the increase in rounding at the nozzle hole inlets increases the amount of deposits and decreases the amount of injected fuel/spray. The results obtained from study conducted in this direction helped to better understand the phenomenon of nozzle geometry resistant to coking phenomena.