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RISS 인기검색어
- 검색키워드
- 저자 : ( Eriko Matsumura ) (검색결과 2 건)
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( Naoto Mizobuchi ),( Hiroki Kambe ),( Eriko Matsumura ),( Takaaki Kitamura ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
Depletion of fossil fuel has become a serious problem by accelerating motorization in Asian countries. Furthermore, regulations on exhaust gas such as Particulate Matter (PM) and Nitrogen oxides (NOx) emitted from internal combustion engine are being strengthened year by year. Then, recent diesel engines are equipped with Diesel Particulate Filter (DPF) as after treatment device for exhaust gas, and PM is collected. However, with the long-term use of DPF, PM accumulates in DPF. As a result, PM collection efficiency deteriorates and pressure loss increases. Therefore, post injection has attracted attention as DPF regeneration method for burning and removing PM in DPF. In post injection, fuel is injected into the cylinder at the middle to late stage of expansion stroke, and unburned hydrocarbon is supplied to the Diesel Oxidation Catalyst (DOC). Then, oxidation heat is generated by oxidation reaction of unburned hydrocarbon and DOC. And the oxidation heat flows into the DPF, thereby burning and removing PM. However, oil dilution to the lubricating oil film on cylinder liner caused by post injection is a serious problem. Because oil dilution is leading to deterioration of sliding properties of piston and thermal efficiency, it is necessary to clarify spray impingement behavior on lubricating oil film. So in this research, we focus on the oil dilution phenomenon caused by post injection and aim for modeling oil dilution phenomenon. In this report, we measured the critical weber number which makes it possible to judge whether or not fuel droplets impinging on lubricating oil film deposits or splash. As a result, it was found that fuel droplets impingement behavior on lubricating oil film is classified into three behaviors by two critical weber numbers. First, We<sub>crP</sub> =(272+11600δ<sub>non</sub><sup>1.29</sup>)Lα<sup>0.01</sup>,second, We<sub>crS</sub> =(235+2255δ<sub>non</sub><sup>1.05</sup>)Lα<sup>0.05</sup>, La=ρ<sub>ο</sub>·σ<sub>ο</sub>·d<sub>in</sub>/μ<sub>ο</sub><sup>2</sup>, Here, ρ<sub>ο</sub> is density of engine oil, σ<sub>ο</sub> is surface tension of engine oil, μ<sub>ο</sub> is viscosity coefficient of engine oil, and Lα is Laplace number.
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Analysis of Non-Evaporating Spray Characteristics from Jatropha Methyl Ester and its Blends
( Annisa Bhikuning ),( Naoki Matsumoto ),( Tomoyuki Mukayama ),( Eriko Matsumura ),( Jiro Senda ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
Biodiesel or Methyl ester is an alternative fuel that is produced from edible and non-edible vegetable oils. Jatropha is one of the promising fuels that can be substitute from diesel fuel in the future. Jatropha methyl ester is produced from non-edible vegetable oil (Jatropha tree). Therefore, Jatropha methyl ester can be acceptable to replace the diesel fuel without make any disturb for the food market in the world. Jatropha trees can be found and easily grown in tropical regions in the world such as Indonesia, Malaysia and India. Tridecane (C13H28) is an alkane hydrocarbon. It is colorless and combustible. The blending of Jatropha methyl ester with tridecane would make change the chemical properties of Jatropha itself. Study in non-evaporating spray characteristics is important in order to understand the spray behavior for biodiesel and its blends. In this paper, Jatropha methyl ester is blended with tridecane in composition of 25% (Jatropha Methyl Ester 25% and tridecane 75%), 50% (Jatropha Methyl Ester 50% and tridecane 50%) and 75% (Jatropha Methyl Ester 75% and tridecane 25%). Non evaporating spray characteristics for diesel sprays provides parameter such as spray tip penetration, spray cone angle and droplet size. However, before spray estimation are led, the conditions inside the vessel are in good condition. In this study, the ambient pressure was 2 MPa and the injection pressures were 50,100 and 150 MPa. The spray tip penetration length is analyzed by using high speed camera and some properties of Jatropha methyl ester blends were analyzed. It is shown that, the correlation between the surface tension, viscosity and density with longer or narrower of spray tip penetration and cone angle can be summarized. Furthermore, the correlations between the blending of Jatropha Methyl Ester and tridecane composition is also affected to the spray tip penetration and cone angle.
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