Fuel Design Concept for Low Emission in Engine Systems 4th Report: Effect of Spray Characteristics of Mixed Fuel on Exhaust Concentrations in Diesel Engine

Kawano, Daisuke; Senda, Jiro; Wada, Yoshimitsu; Fujimoto, Hajime

doi:10.4271/2003-01-1038

Cited by 13 publications

(4 citation statements)

References 18 publications

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“…Both factors could promote the distillation behavior. A number of papers have explored supercritical vaporization as a means to enhance mixing with multi-component fuels, e.g., [48][49][50][51][52], but further work is required to understand the details of supercritical vaporization at engine conditions and the effects on incylinder mixture formation. Another issue of key importance is the mechanism of droplet breakup and coalescence in dense sprays, which affects virtually all aspects of diesel combustion, e.g., spray penetration, fuel vapor distribution, ignition, etc.…”

Section: Spray/multicomponent Vaporization Modelsmentioning

confidence: 99%

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Farrell¹,

Cernansky²,

Dryer³

et al. 2007

SAE Technical Paper Series

326

241

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Section: Spray/multicomponent Vaporization Modelsmentioning

confidence: 99%

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Farrell¹,

Cernansky²,

Dryer³

et al. 2007

SAE Technical Paper Series

326

241

View full text Add to dashboard Cite

“…Consequently, flash-boiling is very effective for lean mixture formation. In fact, the effect of flash-boiling on exhaust emissions from a diesel engine was investigated in the previous study using a single-cylinder diesel engine [11], and it was confirmed that smoke emission was reduced with an increase in degree of decompression. In this experiment, lean mixture formation in the combustion chamber may not be affected by the suppression of droplet vaporization during the latter stage of fuel injection because of the shorter ignition delay (about 1.0 ms).…”

Section: Droplet Sizementioning

confidence: 70%

“…One of the purposes of this study is to achieve flash-boiling by mixing high volatile fuels with low volatile fuels. In the 4th report [11], flash-boiling was obtained by an increase in the initial fuel temperature and the effect of flashing on the spray, combustion, and exhaust emissions was studied. It was concluded that flash-boiling drastically reduced smoke emission because of the improvement of atomization of the fuel.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on flash‐boiling spray of multicomponent fuel

Kawano

Ishii

Suzuki

et al. 2006

Heat Trans. Asian Res.

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Flash-boiling occurs when a fuel is injected into a combustion chamber where the ambient pressure is lower than the saturation pressure of the fuel. It has been known that flashing is a favorable mechanism for atomizing liquid fuels. On the other hand, alternative fuels, such as gaseous fuels and oxygenated fuels, are used to achieve low exhaust emissions in recent years. In general, most of these alternative fuels have high volatility and flash-boiling takes place easily in the fuel spray when injected into the combustion chamber of an internal combustion engine under high pressure. In addition the multicomponent mixture of high-and low-volatility fuels has been proposed in the previous study in order to control the spray and combustion processes in an internal combustion engine. It was found that the multicomponent fuel produces flash-boiling with an increase in the initial fuel temperature. Therefore, it is important to investigate these flash-boiling processes in fuel spray.In the present study, the submodels of a flash-boiling spray are constructed. These submodels consider the bubble nucleation, growth, and disruption in the nozzle orifice and injected fuel droplets. The model is implemented in KIVA3V and the spray characteristics of multicomponent fuel with and without flashing are numerically investigated. In addition, these numerical results are compared with experimental data obtained in the previous study using a constant volume vessel. The flashing spray characteristics from numerical simulation qualitatively show good agreement with the experimental results. In particular, it is confirmed from both the numerical and experimental data that flash-boiling effectively accelerates the atomization and vaporization of fuel droplets. This means that a lean homogeneous mixture can be quickly formed using flash-boiling in the combustion chamber.

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“…The authors have proposed a novel approach regarding fuel design methodology, targeting both diesel and gasoline engines, and have demonstrated that the designed fuels based on this approach were effective in achieving high thermal efficiency and lowemissions pollutants. The fuels tested were composed of carbon dioxide (CO 2 ) and gas oil [7,8], gasoline and gas oil [9,10], and gas fuel and gas oil [11,12]. In this fuel design approach, the flash boiling phenomenon in the injected spray was employed positively to enhance the evaporation process and some of the components in the designed fuel were used to control chemical processes.…”

Section: Introductionmentioning

confidence: 99%

Improvement of combustion and emissions in diesel engines by means of enhanced mixture formation based on flash boiling of mixed fuel

Senda

Wada

Kawano

et al. 2008

International Journal of Engine Research

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A novel approach to reduce diesel engine emissions at relatively low injection pressures is proposed. This approach is based on the use of a mixed fuel where an additive or a low boiling point fuel such as CO2, gas fuel, or gasoline is mixed with a higher boiling point fuel such as diesel gas oil. When producing such a fuel, the vapour—liquid equilibrium in the two-phase region where the liquid and vapour phases of both components coexist is taken into account. In designing a mixed fuel, the authors intend to control both the physical process in the spray such as fuel evaporation and vapour air mixing and the chemical processes including spontaneous ignition and with reactions with regard to NOx, particulate matter (PM), and hydrocarbon (HC) formation. In this study flash boiling of mixed fuel is particularly focused on enhancing the mixing process in the spray because it has the potential to achieve fast evaporation and relatively lean and homogeneous mixtures. Experiments were carried out using two types of mixed fuel, both of which can generate flash boiling during injection events. In an experiment using a rapid compression machine (RCM) and an optical engine, mixed fuels consisting of liquefied CO2 as an additive and n-tridecane representing gas oil were employed with the aim of simultaneously reducting soot and NOx emissions. The high-speed images acquired for sprays reacting in the RCM and the engine clearly showed a significant reduction of soot formation in the spray. Reductions of soot and NOx emissions as well as the fuel consumption were also confirmed by emission measurements and a combustion analysis respectively. In other experiments, different types of mixed fuel consisting of gas or gasoline and gas oil were tested to see the effects on both the evaporation and ignition processes. The result of an engine experiment showed marked reductions of soot and HC emissions and fuel consumption.

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Fuel Design Concept for Low Emission in Engine Systems 4th Report: Effect of Spray Characteristics of Mixed Fuel on Exhaust Concentrations in Diesel Engine

Cited by 13 publications

References 18 publications

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Numerical study on flash‐boiling spray of multicomponent fuel

Improvement of combustion and emissions in diesel engines by means of enhanced mixture formation based on flash boiling of mixed fuel

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