The design and testing of a kW-class free-piston Stirling engine for micro-combined heat and power applications

Park, Ji-Ho; Ko, Jong Soo; Kim, Hyo-Bong; Hong, Yong-Ju; Yeom, Hankil; Park, Seong-Je; In, Sehwan

doi:10.1016/j.applthermaleng.2019.114504

Cited by 31 publications

(9 citation statements)

References 18 publications

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“…As a promising energy conversion device, LEG has potential benefits over traditional internal combustion engines (TCE) in terms of efficiency and emissions, which has been extensively studied. 17,18 Guo et al 19 compared LEG and TCE through simulation and modeling, experimental research, and control strategies. LEG showed the advantages of high efficiency energy conversion, shortened energy transfer chain, multiple combustion modes, and multiple fuel adaptability.…”

Section: Introductionmentioning

confidence: 99%

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Gas exchange stability of linear engine generator under fuel injection quantity fluctuation

Lifu

Yuan

Zeng

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Gas exchange instability is an important issue that affects the stability of the linear engine generator (LEG). Fuel injection quantity fluctuation is a potential disturbance factor that induces LEG gas exchange instability. In order to grasp the impact of fuel injection quantity changes on LEG under the action of multi-field coupling the effect of gas exchange stability, a numerical model of the coupling of motion-combustion-gas exchange multiprocessing is constructed, and the calculation method of cyclic iteration of the simulation results of each process is adopted to simulate and study the performance characteristics of the LEG gas exchange process under the fluctuation of fuel injection. The results demonstrate that the reciprocating frequency, movement stroke of LEG, and the fluctuation of fuel injection quantity present positive correlation characteristics. The increase of fuel injection quantity causes the piston to move faster near the reciprocating dead point, so the time provided for the gas exchange flow is compressed. Moreover, the increase in fuel injection quantity means that more fuel participates in the combustion process, releases more heat, and enhances the pressure and temperature of the gas in the cylinder. Although this is conducive to the rapid discharge of more combustion exhaust gas in the free exhaust phase, due to the shortening of the gas exchange flow time. The actual exhaust gas scavenging efficiency decreases with the increase of the fuel injection quantity and the corresponding fresh charge trapping efficiency shows an increasing trend.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gas exchange stability of linear engine generator under fuel injection quantity fluctuation

Lifu

Yuan

Zeng

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…By this way, there are no driving mechanisms and the pistons motion is only based on the variation of the working gas pressure. This results in longer operating life, lower noise pollution, maintenance and vibration free, self-starting and high thermal efficiency [16,17]. For this reason, the FPSE technology is preferred for several applications, such as solar converters (dish Stirling) [18], cryocoolers [19] and micro combined heat and power (CHP) units.…”

Section: Introductionmentioning

confidence: 99%

Free-Piston Stirling Engine Technologies and Models: A Review

Perozziello

Grosu

Vaglieco³

2021

Energies

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The Stirling engine is an alternative solution to produce cleaner energy in order to achieve the reduction of the fossil fuel consumption and the CO2 emissions. It comprises an external combustion engine that can convert any external heat source into mechanical power, through cyclic expansion and compression of a working gas in a closed-regenerative cycle, with or without driving mechanisms. The free-piston Stirling Engine is significantly preferred because of the absence of any mechanical linkage resulting in longer operating life, lower noise pollution, maintenance and vibration free, self-starting and high thermal efficiency. The aim of this paper is to summarize the research works on the free-piston Stirling engine technologies and models. First, the working principles of the free-piston Stirling engine are described, identifying different configurations. Then, several applications are presented. Finally, a detailed review of the models available in literature is given, pointing out the main assumptions and equations.

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“…The simulation results were verified with the experimental data of SUTech-SR-1 prototype Stirling engine and a good agreement was obtained. Park et al (Park et al, 2020) designed and tested a free piston Stirling engine equipped with a linear alternator. In the engine two identical power pistons were used to ensure balancing.…”

Section: Introductionmentioning

confidence: 99%

Nodal Thermodynamic and Dynamic Analysis of a Free Displacer Stirling Engine

Çınar¹,

Özdemir²,

Karabulut³

et al. 2021

Isı Bilimi Ve Tekniği Dergisi

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In this study, the dynamic and thermodynamic features of free displacer Stirling engines were investigated by preparing a simulation program. The dynamic component of the simulation program involves the movement equations of power piston, crankshaft and displacer. The thermodynamic component is a nodal analysis based on 24 nodal volumes. The study indicates that starting these engines requires an initial speed is required as the displacer system natural frequency. While the engine is running, the displacer exhibits some secondary vibrations (named as beatings) and causes irregularities in its work and power generation however, it can be minimized by changing some working parameters such as displacer mass, working fluid mass, external loading, spring constant etc. For each value of the working fluid charging pressure, a different spring is needed. While the spring constant is the same, the displacer mass can vary in a limited range. The thermal performance of the engine increases as the displacer mass is decreasing. For an engine working between 1000 K heater temperature, 356 K cooler temperature and 18 bar charging pressure, the effective thermal efficiency ranges between 21 and 26 %. An engine with a 3.5 liter total inner volume is capable of generating about 3.9 kW effective power and 4.7 kW indicated power. A strong relation is observed between engine performance and phase angle.

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The design and testing of a kW-class free-piston Stirling engine for micro-combined heat and power applications

Cited by 31 publications

References 18 publications

Gas exchange stability of linear engine generator under fuel injection quantity fluctuation

Gas exchange stability of linear engine generator under fuel injection quantity fluctuation

Free-Piston Stirling Engine Technologies and Models: A Review

Nodal Thermodynamic and Dynamic Analysis of a Free Displacer Stirling Engine

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