An experimental investigation into the starting process of free-piston engine generator

Jia, Boru; Tian, Guohong; Feng, Huihua; Zuo, Zhengxing; Roskilly, Anthony Paul

doi:10.1016/j.apenergy.2015.02.065

Cited by 119 publications

(57 citation statements)

References 22 publications

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“…Some research into starting FPLEs examined piston dynamics under various operating parameters such as induced current, and thrust force, as shown in Refs. [58][59][60][61]. Jia et al [61] experimentally investigated the starting process of an FPLE under the effects of thrust force.…”

Section: Piston Dynamicsmentioning

confidence: 99%

A review of free-piston linear engines

2016

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Section: Piston Dynamicsmentioning

confidence: 99%

A review of free-piston linear engines

2016

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“…As a result, the mover coupled with two pistons reciprocates between its two dead centres, and the linear electric generator converts this mechanical energy into electrical energy. More details on the prototype and its development approach can be found in our previous publications [3,5,[30][31][32].…”

Section: Fpeg Configurationmentioning

confidence: 99%

“…When the engine is successfully initialised by the linear electric machine with a mechanical resonance method [3,5,31], the fuel delivery and ignition systems are activated and the electrical discharge between the spark plug electrodes starts the heat release process at the end of the compression stroke [30]. The prototype specifications and the values of the main input parameters are listed in Table 1.…”

Section: Fpeg Configurationmentioning

confidence: 99%

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A Decoupled Design Parameter Analysis for Free-Piston Engine Generators

et al. 2017

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Abstract:The free-piston engine generator (FPEG) is a novel power generation device with an estimated brake efficiency (energy contained in the fuel that is transformed into useful work) of up to 46%, compared to the 25-35% reported in conventional reciprocating engines. This paper seeks to address a major challenge in the development of new and complex technologies-how do we effectively communicate and understand the influence of key design parameters on its operating performance? In this paper, the FPEG is described using a simple numerical model, a model which is reduced to a forced mass-spring vibration system under external excitation, enabling all the major input parameters to be decoupled. It proved that the engine piston position as a function of time and output power could be predicted directly from the input parameters with acceptable accuracy. The influence of the key FPEG design parameters on the piston oscillation characteristics and electric power output can be characterised with respect to one another and summarised. Key design parameters include piston mass, compression stroke length, piston cross sectional area, and electric load. Compared with previous and more complex numerical models, the presented methods can be used to simply describe the sensitivity of key design parameters on the FPEG performance. It will provide useful general guidance for the FPEG hardware design process.

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“…Besides, the open-loop control strategy was used to control the fuel consumption, injection timing and throttle opening of the prototype and programmed by the software LabVIEW (NI, Austin, TX, USA). More details about the prototype development, modelling and experimental results can be found elsewhere [31][32][33][34]. The collected parameters during the test included in-cylinder gas pressure, piston position and the pressure in the scavenging case.…”

Section: Description Of the Test Benchmentioning

confidence: 99%

Research on the Combustion Characteristics of a Free-Piston Gasoline Engine Linear Generator during the Stable Generating Process

et al. 2016

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The free-piston gasoline engine linear generator (FPGLG) is a new kind of power plant consisting of free-piston gasoline engines and a linear generator. Due to the elimination of the crankshaft mechanism, the piston motion process and the combustion heat release process affect each other significantly. In this paper, the combustion characteristics during the stable generating process of a FPGLG were presented using a numerical iteration method, which coupled a zero-dimensional piston dynamic model and a three-dimensional scavenging model with the combustion process simulation. The results indicated that, compared to the conventional engine (CE), the heat release process of the FPGLG lasted longer with a lower peak heat release rate. The indicated thermal efficiency of the engine was lower because less heat was released around the piston top dead centre (TDC). Very minimal difference was observed on the ignition delay duration between the FPGLG and the CE, while the post-combustion period of the FPGLG was significantly longer than that of the CE. Meanwhile, the FPGLG was found to operate more moderately due to lower peak in-cylinder gas pressure and a lower pressure rising rate. The potential advantage of the FPGLG in lower NO x emission was also proven with the simulation results presented in this paper.

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An experimental investigation into the starting process of free-piston engine generator

Cited by 119 publications

References 22 publications

A review of free-piston linear engines

A review of free-piston linear engines

A Decoupled Design Parameter Analysis for Free-Piston Engine Generators

Research on the Combustion Characteristics of a Free-Piston Gasoline Engine Linear Generator during the Stable Generating Process

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