Coupled dynamic–multidimensional modelling of free-piston engine combustion

Mikalsen, R.; Roskilly, Anthony Paul

doi:10.1016/j.apenergy.2008.04.012

Cited by 90 publications

(38 citation statements)

References 13 publications

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“…This brings the ability to accommodate multi-fuel by easily controlling the compression ratio without modifying the mechanical structure. The energy conversion efficiency can be increased with optimizing the compression ratio [6][7][8][9]. Furthermore, the key performances of FPLG, the output power and system efficiency could be improved by controlling the motion state of the piston [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The researchers in [6,20,26] presented a full-cycle simulation model, which consisted of a single piston engine, linear electric machine and a gas spring bounce chamber. The stable operation was achieved by adjusting the combustion and rebounding parameters.…”

Section: Introductionmentioning

confidence: 99%

“…The in-cylinder pressure and temperature increase with the release of heat in the early stage of expansion process. On the basis of the first law of thermodynamics [6,31,34], the thermodynamic process in ICE can be described as:…”

mentioning

confidence: 99%

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A Free-Piston Linear Generator Control Strategy for Improving Output Power

Zhang

Chen

et al. 2018

Energies

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This paper presents a control strategy to improve the output power for a single-cylinder two-stroke free-piston linear generator (FPLG). The comprehensive simulation model of this FPLG is established and the operation principle is introduced. The factors that affect the output power are analyzed theoretically. The characteristics of the piston motion are studied. Considering the different features of the piston motion respectively in acceleration and deceleration phases, a ladder-like electromagnetic force control strategy is proposed. According to the status of the linear electric machine, the reference profile of the electromagnetic force is divided into four ladder-like stages during one motion cycle. The piston motions, especially the dead center errors, are controlled by regulating the profile of the electromagnetic force. The feasibility and advantage of the proposed control strategy are verified through comparison analyses with two conventional control strategies via MatLab/Simulink. The results state that the proposed control strategy can improve the output power by around 7-10% with the same fuel cycle mass.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Free-Piston Linear Generator Control Strategy for Improving Output Power

Zhang

Chen

et al. 2018

Energies

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“…As for the combustion process analysis, most reports used zero-dimensional, single-zone models to simulate the working process of the FPLG, which showed a limited accuracy to predict the parameters in the combustion process. Afterwards, with the development of the CFD software, the coupled dynamic-multidimensional model was applied, which could account for the gas flow in the cylinder [23] and had a higher accuracy to describe the combustion details of the FPLG. However, the scavenging performance was usually ignored in the model, which was supposed to have significant effects on the combustion process for the FPLG.…”

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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“…Multi-dimensional CFD codes are widely used in the design and development of internal combustion engines due to their ability to investigate variables that are difficult or costly to measure in experimental tests. 24 CFD offers an expedient means for investigating the flow, gas exchange, and combustion processes under realistic engine operating conditions and identification of important features and major underlying interactions between them. 25 Although OP2S engine has already been commonly modeled and tested by many researchers, most of these researches focus on the basic engine performance; they are unable to identify details of the engine design and operating parameters.…”

Section: Introductionmentioning

confidence: 99%

Scavenge flow analysis of opposed-piston two-stroke engine based on dynamic characteristics

Zhao

et al. 2015

Advances in Mechanical Engineering

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Opposed-piston two-stroke engine has been proposed by Beijing Institute of Technology to improve power density and complete machine balance relative to conventional engines. In order to study opposed-piston two-stroke engine scavenging flow, a scavenging system was configured using a three-dimensional computational fluid dynamics model effectively coupled to experiments. The boundary conditions are obtained through one-dimensional working process simulation results and experiments. As the opposed-piston relative dynamic characteristics of opposed-piston two-stroke engine depend on different design and operating parameters including the opposed-piston motion phase difference and crankconnecting rod ratio, a numerical simulation program was built using MATLAB/Simulink to define opposed-piston motion profiles based on equivalent crank angle of opposed crank-connecting rod mechanism. The opposed-piston motion phase difference only affects scavenging timing while crank-connecting rod ratio affects scavenging timing and duration. Scavenging timing and duration are the main factors which affect scavenging performance. The results indicate that a match of opposed-piston motion phase difference and crank-connecting rod ratio has the potential to achieve high scavenging and trapping efficiency with a right flow in cylinder.

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Coupled dynamic–multidimensional modelling of free-piston engine combustion

Cited by 90 publications

References 13 publications

A Free-Piston Linear Generator Control Strategy for Improving Output Power

A Free-Piston Linear Generator Control Strategy for Improving Output Power

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

Scavenge flow analysis of opposed-piston two-stroke engine based on dynamic characteristics

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