A computational study of free-piston diesel engine combustion

Mikalsen, R.; Roskilly, Anthony Paul

doi:10.1016/j.apenergy.2008.08.004

Cited by 116 publications

(53 citation statements)

References 19 publications

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“…The results showed that the performance of the FPLG had a slight advantage over the conventional engine for faster-burning fuels [14]. In 2009, a computational study was undertaken to investigate the in-cylinder gas motion, combustion process and nitrogen oxide formation in a diesel FPLG [15]. It was found that the in-cylinder gas temperature in the FPLG was lower than that in the CE, which contributed to the decrease of the NO x emission.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…A two-stroke operating cycle is usually used in the electrical generators on the basis of a free-piston engines [3,6,7]. There are different types of coupling of the free-piston internal combustion engine and an electric generator [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

More Effective Control of Linear Switched-Reluctance Motor Based on the Research of Electromagnetic Processes of Field Theory Methods Linear Electrical Machines

Kolpakhchyan

Shaikhiev

Kochin

2016

Advances in Intelligent Systems and Computing

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The results of research of electromagnetic processes in linear switched-reluctance motor of various designs are presented. The methods of the electromagnetic field theory in a three-dimensional formulation are used. The analysis of the possibility of an independent control of phases of the considered electrical machines is carried out. The technical solution to improve the accuracy of the electromagnetic force regulation is proposed.

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“…Nowadays, a number of cold and hot flow CFD simulation studies have been carried out to understand in-cylinder flow field, combustion and emission processes in IC engines [12][13][14][15]. These investigations have shown that complex flow structures like swirl, tumble and turbulence exist inside the engine cylinder, even after the closure of the intake valve [16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Scavenging System Configuration on In-Cylinder Air Flow Organization of an Opposed-Piston Two-Stroke Engine

Zhao

Zhang

et al. 2015

Energies

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Abstract:In-cylinder air flow is very important from the point of view of mixture formation and combustion. In this direction, intake chamber structure and piston crown shape play a very crucial role for in-cylinder air pattern of opposed-piston two-stroke (OP2S) engines. This study is concerned with the three-dimensional (3D) computational fluid dynamics (CFD) analysis of in-cylinder air motion coupled with the comparison of predicted results with the zero-dimensional (0D) parametric model. Three configurations viz., a flat piston uniform scavenging chamber, a flat piston non-uniform scavenging chamber and a pit piston non-uniform scavenging chamber have been studied. 0D model analysis of in-cylinder air flow is consistent with 3D CFD simulation. It is concluded that a pit piston non-uniform scavenging chamber is the best design from the point of view of tumble ratio, turbulent kinetic energy and turbulent intensity, which play very important roles in imparting proper air motion. Meanwhile a flat piston uniform scavenging chamber can organize a higher swirl ratio and lower tumble ratio which is important to improve the scavenging process.

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A computational study of free-piston diesel engine combustion

Cited by 116 publications

References 19 publications

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

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

More Effective Control of Linear Switched-Reluctance Motor Based on the Research of Electromagnetic Processes of Field Theory Methods Linear Electrical Machines

Effects of Scavenging System Configuration on In-Cylinder Air Flow Organization of an Opposed-Piston Two-Stroke Engine

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