JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
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Volume 26, Issue 12
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1991 Volume 26 Issue 12 Pages 645-653
    Published: December 01, 1991
    Released on J-STAGE: May 31, 2010
    DOIhttps://doi.org/10.5988/jime1966.26.12_645
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 26 Issue 12 Pages 654-660
    Published: December 01, 1991
    Released on J-STAGE: May 31, 2010
    DOIhttps://doi.org/10.5988/jime1966.26.12_654
    JOURNAL FREE ACCESS
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  • Analysis of Cooling Process of T-shaped Welded Joint
    Toshimichi FUKUOKA, Naoki YAMASAKI, Shinji FUKUI
    1991 Volume 26 Issue 12 Pages 661-668
    Published: December 01, 1991
    Released on J-STAGE: May 31, 2010
    DOIhttps://doi.org/10.5988/jime1966.26.12_661
    JOURNAL FREE ACCESS
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    It is well known that the strength of welded joint is largely influenced by the cooling cycle around the bond. Theoretical solutions in heat conduction are very useful to estimate the cooling cycle of the welded joint with simple configuration. However, numerical methods must be introduced when dealing with a complicated-shaped welded joint. In this paper, the cooling process of T-shaped welded joint is analyzed by means of 3-dimensional F.D.M. where irregular meshes are used in the plane which is perpendicular to the direction of welding. The governing equation here is for a quasi-static temperature field because heat input by arc can be treated as moving heat source. The effects of plate thickness and height on the cooling cycle are evaluated, and the accuracy of the numerical solutions are examined by the experiment of CO2 arc welding.
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  • Estimation for Flame Structure and Suppression of Soot Emission by Addition of Nitrogen Gas into Propane Gas Fuel
    -Numerical Simulation-
    Osami Nishida
    1991 Volume 26 Issue 12 Pages 669-677
    Published: December 01, 1991
    Released on J-STAGE: May 31, 2010
    DOIhttps://doi.org/10.5988/jime1966.26.12_669
    JOURNAL FREE ACCESS
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    A numerical simulation of an axisymmetric confined diffusion flame formed between a C3H8-N2 jet and cof lowing air at 2m/s is presented, for the suppression of soot formation rate by adding N2 gas. Soot reduction is systematically estimated by adjusting the amounts of the added N2 gas.
    Modeling the formed soot quantity approaches based on the evaluation of the number density of soot radical nuclei and soot particles, under the experimental data measured by Nishida, et al. The mathematical model employs a standard two-equation, k-ε model to calculate the reaction rates.
    Predictions of a lowering of soot formation rate by adding N2 gas are in reasonable qualitative agreement with experimental data. When the N2 gas of 50 vol.% is added, finally exhausted concentration of soot is decreased the about 10% in compared with non-added N2 gas.
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  • Mixing Agitation of Ethanol Blended Fuels Including Light Cycle Oil
    -Agitation Effect of Labyrinth Pump-
    Shinji Moriya, Naotsugu Isshiki, Tomoyuki Ito
    1991 Volume 26 Issue 12 Pages 678-684
    Published: December 01, 1991
    Released on J-STAGE: May 31, 2010
    DOIhttps://doi.org/10.5988/jime1966.26.12_678
    JOURNAL FREE ACCESS
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    For high speed diesel engines, gas oil and lighter heavy oil are used in general, but, in order to decrease smoke particulates and nitorogen oxide in exhaust gas and also to prepear for the future oil shortage, blending of alternative fuels such as alcohols for diesel engines are recently studied widely in many institutes.
    In general, ethanol blended gas oil fuels do not stay at solution state for long time at any mixed ratio, so, a surface active agent is generally used in industry for duration of solution state.
    But, the authors picked up labyrinth pump as a mechanical agitator and pump at the same time, and tried many experiments of agitation of blended fuels including light cycle oil which has a good ability of improving blending condition.
    Here reported the results which shows optimum condition of agitation of blended fuels.
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  • Mean Molecular Weight, and carbon Distribution and Structural Group Analysis for Lubricating Oil
    Tsuyoshi Ogawa
    1991 Volume 26 Issue 12 Pages 685-687
    Published: December 01, 1991
    Released on J-STAGE: May 31, 2010
    DOIhttps://doi.org/10.5988/jime1966.26.12_685
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    The calculation of the mean molecular weight of petroleum oils has been researched with kinematic viscosity measurements at 37.8°C and 98.9°C by ASTM D 2502-87. The author toward this method has devised the estimation method, which is the calculation with kinematic viscosity measurements of lubricating oil at 40°C and 100°C by the change of Alfred E. Hirschlers formulas with a few deviation and this calculating method is applicable to oils with viscosity indices between-50-+120.
    And the calculation of carbon distribution and structural group analysis of petroleum oils can be researched with measurements of refractive index, density and mean molecular weight by ASTM D 3238-85.
    The results of calculation of oils can be used for the following: -
    (1) adjunct to the bulk properties in monitoring the manufacture of lubricating oils.
    (2) comparing the composition of stocks from different crude sources.
    (3) correlativity with critical product performance properties.
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  • ERRATUM
    1991 Volume 26 Issue 12 Pages ii
    Published: 1991
    Released on J-STAGE: May 31, 2010
    DOIhttps://doi.org/10.5988/jime1966.26.12_ii
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