Akademik Veri Yönetim Sistemi
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.39, sa.3, ss.1473-1484, 2024 (SCI-Expanded)
Extensive use of petroleum as fuel causes some negative developments such as; variation of climate, pollution of environment, degeneration of some living thinks, increase of some catastrophic events etc. In order to prevent these negative developments, the use of clean and endless energies such as solar energy, nuclear energy, geothermal energy, hydrogen energy etc. is needed. For the use of these energies, the development of an engine able to convert all of the heat energies into mechanical energy is needed. One of the machines being developed for this purpose is the Stirling engine. Despite that Stirling engine is not a machine being used in industrial areas, it is one of the machines on which too much investigations are ongoing. In this study, the thermodynamic performance of an alpha type Stirling engine, having a Crank-Shifted Piston Driving Mechanism, is investigated. The work, power, mean pressure and thermal efficiency are optimized with respect to cylinder length, the amount of crank shifting, relative position of cylinders, length of connecting rods, temperature of hot end and mass of the helium used as working fluid. The mathematical model used in the study consists of kinematic relations, the first law of thermodynamics, the equation of state of ideal gases, the law of conservation of mass, and the Schmidt formula. Corresponding to 3.5 g helium mass, 800 K heater temperature, 328.5 mm distance between cylinder top and crank center, 171 mm connecting rod length and 40 mm crank shifting; the analysis provided 223 J work, 24.9 bar mean pressure, 3.55 kW power and 52% thermal efficiency.