In-Cylinder Flow in High Speed Two-Stroke Engines with Different Transfer Channels

Ekenberg, Martin; Johansson, Bengt

doi:10.4271/970357

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…This is also the scavenging phase. However, since the transfer port and the exhaust port are open at the same time during the downstroke, this means some of the unburnt fuel-air mixture will flow directly out of the exhaust port before the piston closes the exhaust port during the upstroke [2]. With the momentum of the flywheel which is attached to the crankshaft, the piston begins the upstroke and the cycle repeats.…”

Section: Operating Principlementioning

confidence: 99%

“…There would also need to be shafts, linkages, and rocker arms connected to the camshaft to control the timing of the valves on a 4-stroke engine to ensure the valves open and close at the appropriate time to ensure a continuous combustion cycle, this would add significant complexity and cost to the manufacturing of the engine. Furthermore, a 2stroke engine does not need dedicated systems for lubrication, unlike a 4-stroke engine which would either require an oil sump or an oil pump system since the oil is either directly injected into the engine where it will mix with the fuel or be mixed with the fuel when putting in a fuel tank, further increasing the simplicity and decreasing the manufacturing complexity and cost [2]. As a result of the above, in most cases, a 2-stroke engine is lighter, smaller, and cheaper to produce than a 4-stroke engine of the same power output.…”

Section: Simplicitymentioning

confidence: 99%

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Research Progress of Two-Stroke Internal Combustion

Mao

2024

HSET

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In a world that is gradually moving towards renewable sources of energy, the 2-stroke motor with it is low efficiency and high emission is being phased out. However, there are some applications which require the unique characteristics of the 2-stroke motor, making it the only suitable form of power for those applications. This paper will discuss the operating principle of the 2-stroke motor, how its construction is able to be simplistic and light, and how it has a high power-to-weight ratio. This paper will also discuss the relatively inefficient scavenging process caused by the simplistic nature of the 2-stroke engine, leading to high emission, low efficiency, short engine life, and noise. To solve these problems, mechanical solutions such as electronically controlled direct injection, delayed charging, and variable compression have been developed and are now common, while recent research into the use of bioethanol and hydrogen as fuel can further decrease emissions and increase efficiency. Therefore, the purpose of this paper is to summarize past and recent research regarding the strengths and limitations of 2-stroke internal combustion engines and the future developmental direction of 2-stroke engines in alternative fuel.

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Section: Operating Principlementioning

confidence: 99%

Section: Simplicitymentioning

confidence: 99%

Research Progress of Two-Stroke Internal Combustion

Mao

2024

HSET

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“…In contrast to NOx emissions, higher pressure causes more unburned HC to escape from the exhaust valve, resulting in higher hydrocarbon emissions. During the valve overlap period, as the scavenging of the combustion chamber takes place, part of the fresh mixture could directly flow from the intake to the exhaust valve, so that the embedded unburned fuel is emitted [36]. In some cases, due to the cooling effect that engine walls have on combustion process, the heat transfer to the walls can be significant enough to extinguish the flame, preventing it from completing its combustion process [37].…”

Section: Ati-2023mentioning

confidence: 99%

Preliminary experimental data analysis for Digital Twin development of a large bore Dual-Fuel engine

Mondo,

Pivetta,

Fratti

et al. 2023

J. Phys.: Conf. Ser.

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In recent years, digital models, and in particular Digital Twins (DTs), have seen a growing interest due to their ability to provide support in the development of more efficient systems and processes. This study presents the preliminary steps taken to develop a DT model for a marine Large Bore Dual-Fuel engine manufactured by Wärtsilä. The correlation between dependend and independent data set variables is presented in order to map the engine behaviour and validate the DT model before becoming operational. The analyses are conducted using the engine in gas mode, operating at 85% of Load (at the nominal speed of 600rpm). This operating point represents the typical target design for constant speed applications. The engine efficiency, emissions and combustion chamber parameters are investigated by varying the air-fuel mixture pressure, timing and duration parameters. Sensitivity analysis presents a tight relation between Nitrogen Oxides and Hydrocarbons (HC) emissions by varying the Scavenging Air Pressure. The HC emission function around the nominal value of the Pilot Fuel Injection Duration reverse its trend, while In Cylinder-Pressure and Combustion Duration functions presents opposite gradients. By advancing the Pilot Fuel Injection timing is shown an increase in Engine Efficiency respect to others input parameters.

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Comparison of Motored and Fired Velocities in a Two Stroke Engine

Ghandhi

Miller

1998

SAE Technical Paper Series

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In-Cylinder Flow in High Speed Two-Stroke Engines with Different Transfer Channels

Cited by 4 publications

References 10 publications

Research Progress of Two-Stroke Internal Combustion

Research Progress of Two-Stroke Internal Combustion

Preliminary experimental data analysis for Digital Twin development of a large bore Dual-Fuel engine

Comparison of Motored and Fired Velocities in a Two Stroke Engine

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