Parametric study of gamma-type free piston stirling engine using nonlinear thermodynamic-dynamic coupled model

Ye, Wenlian; Zhang, Ting; Wang, Xiaojun; Liu, Yingwen; Chen, Pengfan

doi:10.1016/j.energy.2020.118458

Cited by 21 publications

(8 citation statements)

References 15 publications

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“…As the core part of FPHS operation, the air exchange process directly affects the operation of the whole engine, and has obvious influence on combustion cycle variation, piston movement, mixture of combustible mixture in cylinder and gas organization. In Figure 5, a multi-dimensional gas exchange model 35 is established to accurately reflect the shape of the FPHS gas exchange mechanism. The model consists of one cylinder, three scavenging channels, one exhaust channel and one inflation box.…”

Section: Gas Exchange Modelmentioning

confidence: 99%

The effect of electromagnetic load fluctuation on the gas exchange stability of a free-piston hybrid power system

Yuan

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The free-piston hybrid power system (FPHS) is affected by the dynamic coupling of combustion drive, power transmission, piston motion, excitation generation and gas exchange, and its operating state is very different from that of traditional engines. In this paper, the influence of the change of electromagnetic load on the ventilation stability of the whole system is studied by combining the method of system simulation and experimental validation. A dynamic-ventilation one-dimensional coupled gas exchange model was established, and the influence of the fluctuation of the electromagnetic load on the gas exchange is simulated by combining the thermodynamic model with the magnetic inductive load model. The results show that the scavenging efficiency is positively correlated with the load fluctuation, while the trapping efficiency changes with the opposite rule. Specifically, increasing the electromagnetic load properly will increase the time of gas exchange and obtain more fresh charge. The reduction of the electromagnetic load will make the compression process have higher gas pressure and temperature, which the mixture of oil and gas is more homogeneous and the combustion rate is faster after ignition. The stability of the ventilation performance of FPHS is very sensitive to electromagnetic fluctuations. The control of FPHS system can be achieved by adjusting the electromagnetic load.

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Section: Gas Exchange Modelmentioning

confidence: 99%

The effect of electromagnetic load fluctuation on the gas exchange stability of a free-piston hybrid power system

Yuan

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Ye vd. [11] gama tipi serbest pistonlu Stirling motorlarının dinamik-termodinamik analizi için bir matematik model geliştirmişler ve geliştirdikleri modeli kullanarak bir motor tasarlamışlardır. Yazarlar yaptıkları tasarımın prototipini de imal etmiş ve başarı ile çalıştırdıklarını ifade etmişlerdir.…”

Section: Giriş (Introduction)unclassified

Üç silindirli gama tipi bir Stirling motorunun ve geleneksel gama tipi bir Stirling motorunun nodal termodinamik analizleri ve performans kıyaslaması

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Topgül

2022

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Geleneksel gama tipi Stirling motorlarında iki silindir mevcut olup silindirlerden birisi aracılığı ile çalışma gazının sıkıştırılması ve genişletilmesi işlemleri, diğeri aracılığı ile çalışma gazının sabit hacimde ısıtılması ve soğutulması işlemleri gerçekleştirilmektedir. Geleneksel gama tipi motorlarda soğuk ve sıcak hacimlerin aynı silindirde bulunması nedeni ile sıcak uçtan soğuk uca iletimle önemli bir miktarda ısı kaybı olmaktadır. Ayrıca dispileyser’ in yapımı oldukça külfetli bir iştir. Bu problemleri yok etmek için, son zamanlarda sıcak ve soğuk hacimleri ayrı ayrı silindirlerde bulunan üç silindirli gama tipi bir motor modeli tanıtılmıştır. Bu motorlarda bulunan silindirlerden birisi sıcak hacim olarak bir diğeri soğuk hacim olarak üçüncüsü de güç silindiri olarak görev yapmaktadır. Bu motorların termodinamik süreçleri geleneksel gama tipi motorunkine çok benzediği için bunlara üç silindirli gama tipi motor adı verilmiştir. Her üç silindirin içerisinde alışılmış tipten pistonlar çalışmaktadır. Bu araştırmada geleneksel gama tipi bir motorun ve üç silindirli gama tipi bir motorun nodal termodinamik analizleri yapılarak performansları kıyaslanmıştır. Motorların çevrimlik işlerinin ve verimlerinin birbirine çok yakın olduğu görülmektedir. Yüksek hızlarda ve yüksek basınçlarında geleneksel gama tipi motorun, yüksek sıkıştırma oranında ise üç silindirli gama tipi motorun az miktarda avantajlı olduğu görülmektedir.

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“…2 The FPSE was invented in 1964 by Beale. 3 The FPSE, as an external combustion type power conversion machine, which offers advantages of simple structure, long life without lubrication, and high efficiency. 4,5 The FPSEs were also divided into three main types, namely alpha, beta, and gamma.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on the Stirling engine power and the efficiency of Stirling engine generator

Wang

2022

Advances in Mechanical Engineering

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With the development of social economy, facing the challenge of depletion of fossil fuel energy, countries in the world have paid close attention to the development of new energy sources in recent years attention is being focused on power engines that use new renewable energy. The Stirling engine is such a power engine. Compared with traditional combustion engines, Stirling engine has the advantages of wide fuel sources, no knocking, high thermal efficiency, low noise, low operating costs, low gas pollution, and high economy. Then, the waste heat can be used to power the Stirling engine. This waste heat will be used in aviation, aerospace, land, ocean, and other fields. The study studied the changes in power and efficiency by changing the ratio according to the dynamic configuration of the Stirling engine and by changing the thermodynamic ratio of the engine. In addition, when installing the regenerator in the Stirling engine system, the changes in output and efficiency were also studied. The results show that the dynamic parameter α is increased, the engine efficiency decreases. When the temperature ratio β increased, the engine efficiency decreased. Then, the efficiency of the Stirling engine with a regenerator was found to be higher than that of the Stirling engine without the regenerator. The results focused on dynamic configuration of the Stirling engine to utilize new renewable energy. This work provides a reliable model and theoretical guidance for improving the FPSE’s performance.

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Parametric study of gamma-type free piston stirling engine using nonlinear thermodynamic-dynamic coupled model

Cited by 21 publications

References 15 publications

The effect of electromagnetic load fluctuation on the gas exchange stability of a free-piston hybrid power system

The effect of electromagnetic load fluctuation on the gas exchange stability of a free-piston hybrid power system

Üç silindirli gama tipi bir Stirling motorunun ve geleneksel gama tipi bir Stirling motorunun nodal termodinamik analizleri ve performans kıyaslaması

Numerical investigations on the Stirling engine power and the efficiency of Stirling engine generator

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