Akademik Veri Yönetim Sistemi
10. International European Congress on Advanced Studies in Basic Sciences , Amsterdam, Hollanda, 26 - 28 Temmuz 2024, ss.386-401
The piston is one of the most important elements that set the vehicle in motion by converting combustion energy into mechanical energy. In internal combustion engines, combustion usually takes place in the space between the piston crown and the cylinder head. In this study, the shape of the piston crown was modified to obtain different types of combustion chamber shapes in direct injection engines. Also, three different piston head designs were used to investigate the thermal convection effects. These are described as crown, curved, and flat. Since the strength of the material at high temperatures is also important, three different materials were analyzed. These are referred to as Partially Stabilized Zirconia (PSZ), 38MnVS6, 42CrMo. A total of nine analyzes were carried out with three different designs and three different materials. The ANSYS program was used to see if the piston would transfer the required amount of heat in the thermal simulation. The results of the thermal analysis were then compared to determine the most suitable material and design. It is also interesting to note that more and more heat was concentrated in the center of the piston. The reason for this is that the heat accumulated in the center has to travel a long way to spread. This situation was observed in all piston geometries. In this design, a temperature of 750 °C on the upper surface of the piston and a temperature of 300 °C on the wall edges were used as boundary conditions. The results displayed that the design that transmitted the best temperature was curved and the PSZ material defined design had a maximum temperature of 749.32 C° and a minimum temperature of 300 C°. It was found that the flat design with 42CrMo material had the lowest thermal conductivity. While the flat design with 42CrMo material had the lowest thermal conductivity, the analysis results revealed that the maximum temperature value was 597.96 C° and the minimum temperature value was 310.29 C°. When compared in terms of geometries, when the material was the same, piston head designs with curved design had the highest temperature, while the lowest temperatures were reached in piston head designs with flat design.