No abstract

No abstract

Cell temperature and selection of the reactant gases are crucial parameters for the design and optimization of fuel cell performance. In this study, effect of operating conditions on the performance of solid oxide fuel cell has been investigated. Application of response surface methodology was applied to optimize operations conditions in solid oxide fuel cell. For this purpose, an experimental set-up for testing of solid oxide fuel cell has been established to investigate the effect of hydrogen, oxygen, nitrogen flow rates and cell temperature parameters on cell performance. Hydrogen flow rate, oxygen flow rate, nitrogen flow rate, and cell temperature were the main parameters considered and they were varied between 0.25 and 1 L/min, 0.5 and 1 L/min, 0 and 1 L/min, and 700-800 ºC in the analyses, respectively. The maximum power density was found as 0.572 W/cm 2 in the experiments.

No abstract

KeywordsThermal analysis Finite element method Thermal barrier coating Aluminum alloy piston Abstract:Performance and operating costs are the most important factors in internal combustion engines. It is one of the most commonly used methods to coat pistons with advanced technological ceramic materials in order to improve performance and fatigue life in internal combustion engines. In this study, changes in temperature and heat flux were investigated in various thickness coatings made on a 2500 cc turbo diesel engine piston. As bonding coat, NiCrAl was used in a thickness of 0.2 mm, while ZrO 2 (zirconium dioxide) was used in thicknesses of 0.2-0.4-0.6 and 0.8 mm as thermal barrier coating material. The piston was modeled in PTC Creo parametric software and then transferred to ANSYS Workbench environment to create a mathematical model. Engineering calculations were also done using the finite element method. After the calculation, the temperatures at the depth of 5 mm from the combustion chamber upper surface, the binder layer upper surface, the thermal coating upper surface and the combustion chamber upper surface were compared. As a result, it was observed that the combustion chamber and the section at the depth of 5 mm from the combustion chamber had a temperature decrease of 13%.