JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
Volume 13 , Issue 12
Showing 1-6 articles out of 6 articles from the selected issue
  • [in Japanese]
    1978 Volume 13 Issue 12 Pages 857-867
    Published: 1978
    Released: May 31, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1978 Volume 13 Issue 12 Pages 868-872
    Published: 1978
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (782K)
  • 1978 Volume 13 Issue 12 Pages 873-895
    Published: 1978
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (13473K)
  • Hajime Fujimoto, G. Takeshi Sato, Toshiaki Matsuzawa
    1978 Volume 13 Issue 12 Pages 896-902
    Published: 1978
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    This paper presents some experimental results of the distance li between the position of first appearance of visible flame and the nozzle tip and the flame growth in a diesel spray using a constant volume combustion chamber.
    The first visible flame appears at the turbulent mixing part of the mixing flow region of a spray. The distance li is dependent on the initial pressure po and the number of nozzle holes, but independent on the initial temperature, the oxygen concentration of the charge and the injection quantity. The relation between li and po can be presented by the following experimental expression:
    lipom (m≅-1) .
    The flame growth speed during pre-mixed flame burning period in the diffusion burning is nearly proportional to the oxygen concentration, but the initial temperature, the initial pressure, the number of nozzle holes and the injection quantity have little effects on the flame growth speed.
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  • Toshimasa Saitoh, Mitsuru Mizuuchi, Kohei Matsumoto, Masashi Nagai, Ma ...
    1978 Volume 13 Issue 12 Pages 903-917
    Published: 1978
    Released: December 08, 2010
    JOURNALS FREE ACCESS
    In relation to the whirling of a propeller shafting, many conditions which were neglected in the conventional methods of calculation-more than three bearing supports, elastic support of the bearing section, gyroscopic effect of the propeller, shearing deformation of the shaft, etc.-were employed to evaluate accurately the natural frequency. Then, the following results were obtained:
    (1) .The 3-point or more support is good to obtain a fairly accurate natural frequency.
    (2) .The spring constant of the stern tube bearing must be measured as accurately as possible.
    (3) .The gyroscopic effect of the propeller and the shearing deformation of the shaft have influence on the natural frequency by about 6% and 1%, respectively.
    Furthermore, an analytical method in which the vibration response calculation could be conducted was established, and its utility was confirmed. Then, it was enabled to calculate the dynamic load acting on the bearing.
    These developments enabled us to predict accurately the whirling of a propeller shafting at the stage of design, and increased reliability in the vibration problems.
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  • 1978 Volume 13 Issue 12 Pages 918-925
    Published: 1978
    Released: May 31, 2010
    JOURNALS FREE ACCESS
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