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GAMA TİPİ SERBEST PİSTONLU BİR STİRLİNG MOTORUNUN DİNAMİK VE TERMODİNAMİK ANALİZİ

DYNAMIC AND THERMODYNAMIC ANALYSIS OF GAMMA TYPE FREEPISTON STIRLING ENGINE

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2013

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Free piston Stirling engines are structurally simple thermodynamic systems converting the heat into the reciprocating translational motion. In free piston Stirling engines mechanical and gas springs are used instead of the flywheels used in kinematic engines. In free piston Stirling engines one of the most important issues is keeping the amplitude of reciprocal motion of the displacer and piston under control. For the design of free piston Stirling engines, because of their structure, the dynamic and thermodynamic analyses are simultaneously conducted. The design and performance predictions of the engine is conducted via a dynamic-thermodynamic analysis including the masses of the dynamic components, constant of springs used in the system, hydrodynamic frictions, pressure forces exerting on the piston and displacer and damping forces caused by work transfer. In this study, via preparing a dynamic and thermodynamic simulation program, the analysis of a cold end connected gamma type free piston Stirling engine that will work in the temperature range of 350-700 K, have been performed. The working limits of the engine were predicted by means of examining the variation of power with the hot end temperature, spring constants of displacer and piston springs, rod diameter of the displacer, the working gas mass in the working volume of the engine and the damping constant due to the work transfer.
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Abstract (Original Language): 
Serbest pistonlu Stirling motorları, ısı enerjisini titreşim tarzında doğrusal bir harekete dönüştüren basit yapılı termodinamik sistemlerdir. Kinematik motorlardaki volanların yerini serbest pistonlu Stirling motorlarında mekanik yaylar ya da gazlı yaylandırıcılar almaktadır. Yer değiştirme pistonu ve güç pistonunun yaptığı titreşim hareketinin genliğini kontrol altında tutmak bu motorların önemli sorunlarından birisidir. Yapısı gereği serbest pistonlu Stirling motorlarının tasarımı dinamik ve termodinamik analizlerin birlikte yapılmasını zorunlu kılmaktadır. Motorun dinamik parçalarının kütleleri, sistemde kullanılan yayların yay sabitleri, sürtünmeler, iş transferinden kaynaklanan kuvvetler ile güç pistonu ve yer değiştirme pistonuna etkiyen gaz kuvvetlerini ihtiva eden kapsamlı bir dinamik-termodinamik analiz ile motorun tasarımı yapılmakta ve performans değerleri belirlenmektedir. Bu çalışmada 700 K sıcak kaynak ve 350 K soğuk kaynak sıcaklığı arasında çalışan, silindirleri soğuk uçtan birleştirmeli, gama tipi, serbest pistonlu bir Stirling motorunun dinamik ve termodinamik analizi yapılmıştır. Motor gücünün; sıcak kaynak sıcaklığına, güç pistonu ile yer değiştirme pistonu yaylarının sabitlerine, yer değiştirme pistonunun kuyruk çapına, çalışma hacmindeki gaz kütlesine ve iş transferinin yarattığı sönümleme sabitine göre değişimleri incelenerek motorun çalışma limitleri belirlenmiştir.
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