Numerical Simulation of a Two-Stroke Linear Engine-Alternator Combination

Atkinson, Christopher M.; Petreanu, Sorin; Clark, Nigel N.; Atkinson, Richard J.; McDaniel, T.; Nandkumar, Subhash; Famouri, Parviz

doi:10.4271/1999-01-0921

Cited by 113 publications

(74 citation statements)

References 3 publications

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“…Furthermore, most of these models have been developed for and validated against conventional engines, and it is questionable whether they are suitable for modelling free-piston engines without modification. Examples of zero-dimensional modelling of free-piston engines can be found in the reports of Mikalsen and Roskilly [8], Atkinson et al [10] and Fredriksson and Denbratt [11].…”

Section: Modelling Free-piston Enginesmentioning

confidence: 99%

Coupled dynamic–multidimensional modelling of free-piston engine combustion

Mikalsen

Roskilly

2009

Applied Energy

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Free-piston engines are under investigation by a number of research groups worldwide, as an alternative to conventional technology in applications such as electric and hydraulic power generation. The piston dynamics of the freepiston engine differ significantly from those of conventional engines, and this may influence in-cylinder gas motion, combustion and emissions formation. Due to the complex interaction between mechanics and thermodynamics, the modelling of free-piston engines is not straight-forward. This paper presents a novel approach to the modelling of free-piston engines through the introduction of solution-dependent mesh motion in an engine CFD code. The particular features of free-piston engines are discussed, and the model for engine dynamics implemented in the CFD code is described. Finally, the coupled solver is demonstrated through the modelling of a spark ignited free-piston engine generator.

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Section: Modelling Free-piston Enginesmentioning

confidence: 99%

Coupled dynamic–multidimensional modelling of free-piston engine combustion

Mikalsen

Roskilly

2009

Applied Energy

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“…Some component equations, including valve train, pumping and accessory did not adopted in the present two stroke engine design. Although main bearing is differing between rotation and linear engine, however, this expression more closed to predict the friction losses on linear engine than Atkinson et al [10] formula. Equations below are used in fmep modeling design simulation.…”

Section: Methodsmentioning

confidence: 92%

“…Atkinson, Patreanu, Clark, Atkinson, McDaniel, Nankumar and Famouri [10] introduced a simple equation for calculate fmep of linear engine. However, this expression developed only based on friction from contacting between piston and cylinder liner.…”

Section: Methodsmentioning

confidence: 99%

Prediction Studies for the Performance of a Single Cylinder High Speed Spark Ignition Linier Engine with Spring Mechanism as Return Cycle

Fathallah¹,

Bakar²

2009

American J. of Engineering and Applied Sciences

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Problem statement: Most concepts of linear engines were constructed as opposed pistons with complicated control devise to drive the engines. The advantage of the engines was their high overall efficiency. Approach: Although the efficiency was higher than conventional engine, however, it did not be applied yet, because the design of these engines was not only difficult to fabricate, but also it has little chance to compete the traditional engines in the market. Spring is adopted as a return force of the piston movement technique. Results: The unique of using spring as return cycle is the main characteristic of these engines. However, stroke of the engine is not constant as in the traditional engine. The problem is that, the expansion stroke is depending on thrust force of piston. On the other hand, the engine needs to operate in variable speed and load. This study is a prediction of the performance of both rotational and linear engines. Conclusion/Recommendations: The result of the examination can be used as return cycle design data of a single cylinder linear engine with spring device. As a result, the spring mechanism can be adopted to be used as return cycle in linear engine.

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“…Due to its unique structure and working principle, the free piston engine has the advantages of mechanical simplicity, low frictional losses, high efficiency, high suitability for multi-fuel or homogeneous charge compression ignition (HCCI) operation, and low emissions [1][2][3][4][5][6][7][8]. The history of the research and development on free piston engines can be divided into two phases [2].…”

Section: Introductionmentioning

confidence: 99%

Study of the Injection Control Strategies of a Compression Ignition Free Piston Engine Linear Generator in a One-Stroke Starting Process

et al. 2016

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For a compression ignition (CI) free piston engine linear generator (FPLG), injection timing is one of the most important parameters that affect its performance, especially for the one-stroke starting operation mode. In this paper, two injection control strategies are proposed using piston position and velocity signals. It was found experimentally that the injection timing's influence on the compression ratio, the peak in-cylinder gas pressure and the indicated work (IW) is different from that of traditional reciprocating CI engines. The maximum IW of the ignition starting cylinder, say left cylinder (LC) and the right cylinder (RC) are 132.7 J and 138.1 J, respectively. The thermal-dynamic model for simulating the working processes of the FPLG are built and verified by experimental results. The numerical simulation results show that the running instability and imbalance between LC and RC are the obvious characters when adopting the injection strategy of the velocity feedback. These could be solved by setting different triggering velocity thresholds for the two cylinders. The IW output from the FPLG under this strategy is higher than that of adopting the position feedback strategy, and the maximum IW of the RC could reach 162.3 J. Under this strategy, the prototype is able to achieve better starting conditions and could operate continuously for dozens of cycles.

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Numerical Simulation of a Two-Stroke Linear Engine-Alternator Combination

Cited by 113 publications

References 3 publications

Coupled dynamic–multidimensional modelling of free-piston engine combustion

Coupled dynamic–multidimensional modelling of free-piston engine combustion

Prediction Studies for the Performance of a Single Cylinder High Speed Spark Ignition Linier Engine with Spring Mechanism as Return Cycle

Study of the Injection Control Strategies of a Compression Ignition Free Piston Engine Linear Generator in a One-Stroke Starting Process

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