An Investigation on the Effects of Gas Pressure Drop in Heat Exchangers on Dynamics of a Free Piston Stirling Engine
محل انتشار: ماهنامه بین المللی مهندسی، دوره: 30، شماره: 2
سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 317
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شناسه ملی سند علمی:
JR_IJE-30-2_017
تاریخ نمایه سازی: 6 شهریور 1396
چکیده مقاله:
This paper is devoted to study the effects of pressure drop in heat exchangers on the dynamics of a free piston Stirling engine. First, the dynamic equations governing the pistons as well as the gas pressure equations for hot and cold spaces of the engine are extracted. Then, by substituting the obtained pressure equations into the dynamic relationships the final nonlinear dynamic equations governing thefree piston Stirling engine are acquired. Next, effects of the gas pressure drop in heat exchangers on maximum strokes of the pistons and their velocities and accelerations are investigated. Furthermore, influences of pressure drop increase in the heat exchangers on maximum and minimum gas volume and pressure in both hot and cold spaces are evaluated. Finally, the trend of variations of work andpower corresponding to the increase of pressure drop in the heat exchangers are studied. Based on the obtained results of this paper, the assumption of uniform pressure distribution in the engine cylinder(as used in the Schmidt theory) causes some errors in predicting the dynamic behavior of the free piston hot-air engines. Besides, the increase of pressure drop in the heat exchangers results indeteriorating the dynamic performance of the engine
کلیدواژه ها:
نویسندگان
sh zare
Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz, Iran
a.r Tavakolpour-Saleh
Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz, Iran
o Aghajanzadeh
Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran