Numerical analysis of two-stroke free piston engine operating on HCCI combustion

Xu, Shen; Wang, Yang; Zhu, Tao; Xu, Tao; Tao, Chengjun

doi:10.1016/j.apenergy.2011.05.002

Cited by 34 publications

(21 citation statements)

References 20 publications

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“…They concluded that a higher scavenging temperature was needed to maintain the combustion phasing. As mentioned above, numerical models incorporating detailed thermo-kinetics [77,79] or reduced chemical mechanisms [78] showed the level of detail needed to accurately predict the overall process of HCCI combustion. However, that level of detail requires Fig.…”

Section: Hcci Combustionmentioning

confidence: 99%

“…They used Matlab/Simulink, Boost, and Senkin to investigate engine performance under HCCI combustion and found that natural gas gave the highest compression ratio (r c = 43.16) and indicated efficiency (g i = 0.5911) of the four fuels, as shown in Table 3. In [79], the authors used single-zone and multi-zone Chemkin models with detailed chemical kinetics and a sequential CFD/multi-zone method to analyze the combustion characteristics and performance of a two-stroke FPLE. They concluded that a higher scavenging temperature was needed to maintain the combustion phasing.…”

Section: Hcci Combustionmentioning

confidence: 99%

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A review of free-piston linear engines

2016

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Section: Hcci Combustionmentioning

confidence: 99%

Section: Hcci Combustionmentioning

confidence: 99%

A review of free-piston linear engines

2016

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“…In his studies, Xu also found that the OP2S engine can help achieve HCCI combustion even at large loads. These studies demonstrate the difference between OP2S and diesel fuel combustion [13]. However, most of the researches conducted were based on simulation.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Combustion and Heat Release Characteristics of an Opposed-Piston Folded-Cranktrain Diesel Engine

Zhao

Zhang

et al. 2015

Energies

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Abstract:In opposed-piston folded-cranktrain diesel engines, the relative movement rules of opposed-pistons, combustion chamber components and injector position are different from those of conventional diesel engines. The combustion and heat release characteristics of an opposed-piston folded-cranktrain diesel engine under different operating conditions were investigated. Four phases: ignition delay, premixed combustion, diffusion combustion and after combustion are used to describe the heat release process of the engine. Load changing has a small effect on premixed combustion duration while it influences diffusion combustion duration significantly. The heat release process has more significant isochoric and isobaric combustion which differs from the conventional diesel engine situation, except at high exhaust pressure and temperature, due to its two-stroke and uniflow scavenging characteristics. Meanwhile, a relatively high-quality exhaust heat energy is produced in opposed-piston folded-cranktrain diesel engines.

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“…Besides the work done in the 20th century, many other work was done in past 10 years, Hofbauer combined the opposed piston engine and the opposed cylinder engine and proposed the opposed piston opposed cylinder (OPOC) engine for heavy-duty vehicles [3]; Franke has carried performance development work by CAE simulations and testing on the OPOC [7]; Herold has done the thermodynamic analysis to demonstrate the fundamental efficiency advantage of an opposed-piston two-stroke engine over a standard four-stroke engine [5]; Regner used modern analytical tools and engineering methods to develop performance and emissions of an opposed-piston engine [8]; Xu has done numerical analysis of two-stroke free piston engine operating on Homogeneous Charge Compression Ignition (HCCI) combustion [9]; Xu has investigated the effect of the in-cylinder flow on mixture formation and combustion in OPOC engine [10]; Chen used AVL-Fire to simulate the scavenging process of OPOC [11].…”

Section: Introductionmentioning

confidence: 99%

Parameter Optimization on the Uniflow Scavenging System of an OP2S-GDI Engine Based on Indicated Mean Effective Pressure (IMEP)

Wang

Feng

et al. 2017

Energies

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Abstract:In this paper, an opposed-piston two-stroke (OP2S) gasoline direct injection (GDI) engine is introduced and its working principles and scavenging process were analyzed. An optimization function was established to optimize the scavenging system parameters, include intake port height, exhaust port height, intake port circumference ratio, the exhaust port circumference ratio and opposed-piston motion phase difference. The effect of the port height on the effective compression ratio and effective expansion ratio were considered, and indicated mean effective pressure (IMEP) was employed as the optimization objective instead of scavenging efficiency. Orthogonal experiments were employed to reduce the calculation work. The effect of the scavenging parameters on delivery ratio, trapping ratio, scavenging efficiency and indicated thermal efficiency were calculated, and the best parameters were also obtained by the optimization function. The results show that IMEP can be used as the optimization objective in the uniflow scavenging system; intake port height is the main factor to the delivery ratio, while exhaust port height is the main to engine trapping ratio, scavenging efficiency and indicated thermal efficiency; exhaust port height is the most important factor to effect the gas exchange process of OP2S-GDI engine.

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Numerical analysis of two-stroke free piston engine operating on HCCI combustion

Cited by 34 publications

References 20 publications

A review of free-piston linear engines

A review of free-piston linear engines

An Experimental Investigation on the Combustion and Heat Release Characteristics of an Opposed-Piston Folded-Cranktrain Diesel Engine

Parameter Optimization on the Uniflow Scavenging System of an OP2S-GDI Engine Based on Indicated Mean Effective Pressure (IMEP)

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