Jet characteristics of CNG injector with MPI system

Bo-yan, XU; Furuyama, Mikio

doi:10.1016/s0389-4304(98)00016-2

Cited by 9 publications

(6 citation statements)

References 0 publications

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“…Imaging a gas jet in a gas environment, which has been difficult to achieve previously, is now a reality. The gas jet agrees with the vortex ball model (Turner 1962;Boyan and Furuyama 1998). The jet is generally narrow with around 23°cone angle and 25 mm of maximum width in a fully developed gas jet.…”

Section: Resultssupporting

confidence: 71%

“…Nevertheless, the jets are clearly seen in the figures. The shapes of the gas jets are in good agreement with the vortex ball model (Turner 1962;Boyan and Furuyama 1998). Figure 8 shows the vortex ball model which is a theoretical model that assumes the gas transient jet can be characterized as a spherical vortex interacting with a steady-state jet.…”

Section: Resultssupporting

confidence: 52%

“…Figure 14 shows the effect of injection and bomb pressure on tip penetration. Jet penetration is proportional to square root of injection time, except (Turner 1962;Boyan and Furuyama 1998) in the early phase. As the bomb pressure increases, jet penetration reduces.…”

Section: Resultsmentioning

confidence: 99%

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The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection

Mohamad

Harrison

Jermy

et al. 2010

J Vis

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A spark plug fuel injector (SPFI), which is a combination of a fuel injector and a spark plug was developed with the aim to convert any gasoline port injection spark ignition engine to gaseous fuel direct injection (Mohamad in Development of a spark plug fuel injector for direct injection of methane in spark ignition engine. PhD thesis, Cranfield University, 2006). A direct fuel injector is combined with a spark plug using specially fabricated bracket connected to a fuel pipe and a fuel path running along the periphery of a spark plug body to deliver the injected fuel to the combustion chamber. The injection nozzle of SPFI is significantly bigger than normal direct fuel injector nozzles. Therefore, it is important to understand the effect of such a configuration on the injection process and subsequently the air-fuel mixing behaviour inside the combustion chamber. The flow was visualized using the planar laser-induced fluorescent technique. For safety reasons, nitrogen was used as fuel substitute. Nitrogen at 50, 60 and 80 bar pressure was seeded with acetone as a flow tracer and injected into a bomb containing pressurised nitrogen. Bomb pressure was varied to simulate the pressure inside combustion cylinder during the compression stroke where actual injections in engine experiments will take place. The shape and depth of tip penetration of the gas jet were measured. Results show that the gas jet follows the behaviour suggested by vortex ball model (Turner in Mechanics 13:356-369, 1962). The cone angle and the maximum jet width of the fully developed gas jets from the SPFI injection are 23°and 25 mm, respectively regardless of the injection pressures. The penetration lengths of the fully developed jets are between 90 and 100 mm at 8-14 ms after the start of injection, depending on the bomb and injection pressure. Jet penetration is directly proportional to the injection pressure but inversely proportional to the cylinder or bomb pressure. The penetration lengths indicate that sufficient distance should be travelled by the gas jet for satisfactory air-fuel mixing in the engine.

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Section: Resultssupporting

confidence: 71%

Section: Resultssupporting

confidence: 52%

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The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection

Mohamad

Harrison

Jermy

et al. 2010

J Vis

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“…Studies on supplying dual-fuel engines with natural gas relate mostly to mixer-based systems [6,7] as well as indirect [5,8,9] and direct injection systems [1,10,11]. However, they do not focus strictly on the widely used gas injected engines.…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis of a Dual-Fuel Combustion Engine Fueled with Diesel Fuel and CNG in Transient Operating Conditions

Pielecha

Wisłocki

Cieślik

et al. 2016

SAE Technical Paper Series

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The paper presents the thermodynamic analysis of the engine supplied with small and large diesel fuel doses while increasing natural gas quantity. The paper presents changes in the combustion process thermodynamic indexes and changes in the exhaust gas emissions for dynamically increased share of the gaseous fuel. The cylinder pressure history was subject to thermodynamic analysis,. based on which the mean indicated pressure, the heat release rate, the quantity of heat released as well as the pressure rate increase after self-ignition were determined. These parameters were also referred to the subsequent engine operation cycles by specifying the scope of the change per cycle. The relationship between the engine load and the start, the center and the end of combustion while increasing the gas amount supplied to the cylinder was indicated. The presented analysis of the results indicates significant impact of the changes in the supplied gas amount on the engine operating indexes and exhaust emissions. The conducted tests made it possible to confirm that significant cooling of the cylinder (determined by the constant temperature of exhaust gas) does not allow combustion of a dual-fuel mixture during dynamic change of the engine fueling. It was shown that there is a relation between the thermal history of the cylinder (steady state conditions), the engine fueling rate and the possibility of combustion of a diesel-methane mixture.

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“…I agree with Mrs Boyan's view that it is more likely to be the work of the younger Tregian. 20 It is written in a formal literary style, beginning 'Behold beer England; learne thy name, thy race, thy offspring. Perisht, or forgotten, by tyme and ignorance ... '.…”

Section: Brusselsmentioning

confidence: 99%

Oportet Meliora Tempora Non Expectare Sed Facere. The Arduous Life of Francis Tregian, the Younger

Willetts¹

2007

Recusant History

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‘One must not wait for better times but create them’. Such was the message that the young Francis Tregian (1574–1617) received from the teaching of Dr William Allen, president of Douai. In such a way he lived his life, preserving his faith and later struggling, in adverse political conditions, to improve the fortunes of his family. Was he also able to copy several important music manuscripts, including the Fitzwilliam Virginal Book? This article is yet another examination of a problem much discussed for over a hundred years.

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Jet characteristics of CNG injector with MPI system

Cited by 9 publications

References 0 publications

The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection

The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection

Analysis of a Dual-Fuel Combustion Engine Fueled with Diesel Fuel and CNG in Transient Operating Conditions

Oportet Meliora Tempora Non Expectare Sed Facere. The Arduous Life of Francis Tregian, the Younger

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