Simultaneous Measurement of Fuel Droplet Deposition Amount and Oil Film Thickness on Spray Impingement Using Double Laser Induced Fluorescence Method

Kambe, Hiroki; Mizobuchi, Naoto; Matsumura, Eriko

doi:10.4271/2017-01-2371

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…As the post fuel injection timing is retarded, the temperature and pressure in the constant volume chamber decrease, the spray penetration of the post fuel becomes longer and the fuel may reach and impinge on the cylinder wall, increasing the quantity of fuel adhering on the cylinder wall. Further, the quantity of oil splash by post fuel impingement has been investigated, 16 and Kanbe et al 17 measured the oil thickness and quantity of the adhering fuel by a double laser induced fluorescence method. With the retardation of the post fuel injection timing, the fuel penetration strongly impinges on the cylinder wall and much engine oil is splashed across the wall and the chamber.…”

Section: Introductionmentioning

confidence: 99%

Oxidation phenomena of diesel post fuel in the expansion stroke

Shibata

Karumai

et al. 2022

International Journal of Engine Research

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Post fuel is injected to avoid plugging of diesel particulate filters (DPF). However, at advanced post fuel injection timings, the post fuel is partially oxidized in the cylinder under the high temperature conditions and the hydrocarbon supplied to DOC is not sufficient to regenerate the DPF. In this paper, partial oxidation phenomena at advanced post fuel injection timings were investigated with an engine and a high pressure-temperature optical constant volume chamber. In the engine experiments, the oxidation ratio of the post fuel was calculated from the exhaust gas composition. When the post fuel is injected at 30 CA ATDC, 83% of the post fuel is oxidized, however when the injection timing is 60 CA ATDC, the oxidation ratio of the post fuel becomes 2.2% and there is a 40.9% fuel loss mostly due to oil dilution. The reaction speed, in-cylinder temperature, and oxygen concentration (mol/m3) at the post fuel injection timing are related to the partial oxidation ratio of the post fuel. In the experiments with the constant volume chamber, the spray behaviors at the post fuel injections were observed. The ignition delay becomes longer with lower in-cylinder temperature and lower oxygen concentration, and the spray dilution of the post fuel during the ignition delays affects the heat release and the location where the partial oxidation in the chamber occurs. Based on the experimental data of engine speed, oxygen concentration, and in-cylinder temperature at the start of post fuel injection, an experimental formula for the post fuel oxidation ratio based on the Arrhenius equation was suggested by multiple regression analysis of the engine test data.

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Section: Introductionmentioning

confidence: 99%

Oxidation phenomena of diesel post fuel in the expansion stroke

Shibata

Karumai

et al. 2022

International Journal of Engine Research

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“…The wall film area and average thickness both increased during the rise of impingement distance. Kambe et al [10] studied sprays impinging on lubricating oil film and measured fuel film thickness and oil film thickness simultaneously. A large difference of deposition amount between the conditions of fuel spray impinges dry wall and lubricating oil film was observed.…”

Section: Introductionmentioning

confidence: 99%

Droplet behaviors of a spray impinging on an oil film by planar laser induced fluorescence

Feng

Ming

Liu

et al. 2021

ICLASS

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Microscopic characteristics of a spray impinging on an oil film have a great influence on the atomization and pollutant emissions. Therefore, the droplet behaviors from the impinging spray and oil film are significantly important to evaluate the spray/film process and need to be deeply understood. In this study, under different viscosity and thickness of the oil film, the droplet behaviors from a spray after impinging on an oil film at different locations were analysed by planar laser induced fluorescence. Results showed that an obvious crown structure is generated after the spray impinged on the oil film in the selected conditions. With the rise of viscosity of the oil film, the crown size becomes larger and larger size droplets are generated. The droplet diameter with maximum frequency and the maximum droplet diameter both display an increase trend as the viscosity rises. However, the maximum droplet velocity declines. The crown structure gets smaller and fewer droplets with large size and low velocity are generated when the oil film thickness declines from 0.5 to 0.2 mm. Besides, a decreasing total number of droplets and a higher probability of relatively smaller droplets are observed at smaller oil film thickness condition. On the contrary, the diameters with maximum frequency are comparable for two film thicknesses. The maximum droplet velocity enlarges as the oil film thickness decreases.

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