JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
Volume 12 , Issue 4
Showing 1-8 articles out of 8 articles from the selected issue
  • [in Japanese]
    1977 Volume 12 Issue 4 Pages 252-257
    Published: April 01, 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1977 Volume 12 Issue 4 Pages 258-264
    Published: April 01, 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
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  • 1977 Volume 12 Issue 4 Pages 265-289
    Published: April 01, 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
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  • Shoichi Iwamoto
    1977 Volume 12 Issue 4 Pages 290-299
    Published: April 01, 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Um emn Verhältnis zwischen Dämpfungsarbeit und Wirkungsöltemperatur des viskosen Drehschwingungs-dämpfers zu ermitteln und such eine Grenze der Dämpfungsenergie zu betrachten, wurde eine experimentalle Untersuchung über die Dämpfungsarbeiten und die Beiwerten der Wärmeübertragung von der Dämpferfläche gegen die Dämpferumlaufzahl durchgeführt. Nach der Vergleichung dieser beiden Ergebnisse erhielt man folgende;
    1. Der mittele Beiwert der Wärmeübertragung über die gesamten Wärmeübertragungsfläche des Dämpfers kann man auf Gleichung Numm Re0.8m berechnen, wormn Num Nusselt-Zahl, Rem Reynolds-Zahl und αm eine Ziffer ist.
    2. Die Ziffer αm wird von Verhältnis Bo/Do und Do/Di abgehangen, wobei Bo/Do Verhältnis von Breit und Ausserdurchmesser des Dämpfers ist und Do/Di Verhältnis von Inner-und Ausserdurchmesser des Dämpfers ist. Bei Bo/Do=0.139-0.5 und Do/Di =1.73-2.11 erhielt man am=0.021-0.03.
    3. Die wirkende Dämpfungsarbeit des Dämpfers stimmt mit der Wärmeströmung aus der Dämpferfläche überein. Dabei kann man die Temperatur des Wirkungsöls gegen die Dämpfungsarbeit mit der folgenden Folmel berechnen;
    Ld/Am=0.105αm (tm-t) A0.3mω0.8 [kW/m2]
    wormn (tm-t) die Temperaturdifferenz zwischen die mittele Temperatur der Dämpferfläche und die Atmospharetemperatur, Amder Flächenraum der Wärmeströmung und ω die Winkelgeschwindigkeit der Dämpferumlaufzahl ist.
    Aus der genannten Ergebnisse hat man einen Grund erklärt, der die Wirkungsöltemperatur gegen die Dämpfungsarbeit des Drahschwingungsdämpfers vermutet.
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  • Seiya Mukohara, Osami Nishida
    1977 Volume 12 Issue 4 Pages 300-305
    Published: April 01, 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    As a combustion system in ships, turbulent diffusion flames are widely used. Yet such a combustion system involves various problems to be solved. One of them is that some ill effects are caused by the lowered quality of fuels, and another is how to burn such a fuel as is mixed with various noncombustible ingredients such as waste oil.
    We, therefore, in order to make basic explications about these problems above, made various experiments, using town gas as fuel, under the condition that overall equivalence ratio (φ) is less than the stoichiometric equivalence ratio.
    To sum up the results of our experiments, the most important points are as follows:
    (1) The temperature of the flame reaches its maximum value in the central regions 5cm-25cm from the nozzle tip, while it lowers as the distance from the nozzle tip becomes greater.
    (2) In regard to the gas analysing results of the axial distance, CO, H2 and unburnt hydrocarbon reach their peak value in the neighbourhood of the nozzle, but they become less in the rear-flow, and the combustion efficiency increases at the same time.
    (3) Because the overall equivalence ratio is made by changing the quantity of the combustion air, the diffusible width of flame is affected nice distinction to be entrainment of air transfer across the flame surface.
    It can be said that the experimental flames used in our experiments are not the pure diffusion flames, because we used town gas containing about 3.5 per cent oxygen.
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  • Seikan Ishigai, Shigeyasu Nakanishi, Eiichi Nishikawa, Hideaki Sugita, ...
    1977 Volume 12 Issue 4 Pages 306-312
    Published: April 01, 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    The size distribution and the entrainment of liquid droplets in air water system are determined in two different cylindrical drums with the wide range of the average air velocity of 0.02-2.0 m/s. In addition, the effects of the submerged perforated plates on the size distribution of droplets are investigated with the range of 0.1-0.5 m/s.
    The liquid entrainment and the critical height are affected by the ascending velocity of air, the height from the water level and the diameter of drum. Plotting the size distribution of droplets with the submerged perforated plates on Rosin-Rammler diagrams and the histograms showing the same distribution show that the maximum diameter of droplets decreases, the number of small droplets reduces and the size distribution becomes uniformly as compared with those determined without the plates.
    From these results, the improvement of separators is expected by using the submerged perforated plates.
    The minimum air velocity passing through the holes of plates, at which these effects are detected, is about 2-3 m/s. This value coincides with the critical velocity forming the steam cushion under the perforated plate recommended by M. A. Styrikovich et al.
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  • 1977 Volume 12 Issue 4 Pages 314
    Published: 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
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  • 1977 Volume 12 Issue 4 Pages 440
    Published: April 01, 1977
    Released: May 31, 2010
    JOURNALS FREE ACCESS
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