JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
Volume 29 , Issue 10
Showing 1-14 articles out of 14 articles from the selected issue
  • [in Japanese]
    1994 Volume 29 Issue 10 Pages 682-691
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (4950K)
  • [in Japanese]
    1994 Volume 29 Issue 10 Pages 692-698
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (7104K)
  • Jiro Senda, Hajime Fujimoto, Masaki Kobayashi, Koji Yamamoto, Yoshiter ...
    1994 Volume 29 Issue 10 Pages 699-708
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    In a high-speed D.I. diesel engine, fuel sprays impinge surely on a wall of a piston cavity. Then the phenomenon of the heat transfer between the impinged spray and the wall appears and it has the strong effect on the combustion processes of the engine. The purpose of this study is to clarify basically the heat transfer characteristics. In the experiments, the fuel was injected into the quiescent inert atmosphere with a high temperature under high pressure field, and an evaporative single diesel spray was impinging upon a flat wall. And, the temperature distribution on the wall surface in a radial direction was detected by the Loex-Constantan thin film thermocouples. Thus, the heat flux between the impinged spray and the wall surface was calculated from the temperature profile within the wall by Fourier's equation using the finite difference method, under the assumption of the one-dimensional heat conduction.
    Download PDF (3537K)
  • Osami Hishida, Hirotsugu Fujita, Wataru Harano, Naokazu Hatano, Katsuh ...
    1994 Volume 29 Issue 10 Pages 709-718
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    In industrial nozzles typically used for high load combustoos, the exit velocities are sufficiently large for the flow to be turbulent at nozzle exit. The flow issues from an annular nozzle whereby a region of reverseflow forms in the wake part of the bluff-body. The reverse-flow is instrumental to flame stabilisation.
    Considerable understanding of the role of bluff-bodies has been achieved by measurements of aerodynamic flow patterns. However, in order to get a more detailed understanding of the role of bluff-bodies in the combustion of high speed spray flows, it way be necessary to investigate the distribution of size, number density and velocity of spray particles in the regions surrounding the bluff-body.
    In the present study, a cone-type of bluff-body was fixed in the jet 23 mm from the nozzle exit. The experimental fuel is fed through a nozzle whose inner diameter is 0. 5mm. The nozzle pressure drop was selected to be either 20kPa or 50kPa.
    For this work a Phase Doppler Particle Analyzer (PDPA) and Laser Sheet Photography (LSP) system were used to analyze the apray. The PDPA, Model DSA 3000 from Aerometrics, was set up for 2 axis velocity measurements and fiber-optic transmitter and collecter units. Detailed profiles of spray droplets were measured based on the PDPA together with overall visualization of the spray flow from the photographs.
    The following are noted summarily from the experimental results:
    (1) The mean diameters (D32 and DA) lie within the limits of 10-50μ m and 4-40μm, respectively. The particle sizes become significantly smaller in the side surface regions and wake parts of the bluff-body. However, the number density is higher in those areas.
    (2) The volume flux of particle flows increases slightly near the side surface regions of the bluff-body, but was significantly lower in the wake part.
    (3) The velocity of particles was higher at the top part, and was lower along the side surface region of the bluff-body. The recirculating vortex system was established in the wake regions of the bluff-body.
    Download PDF (2737K)
  • Tomoji Takamasa
    1994 Volume 29 Issue 10 Pages 719-728
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Friction loss of rough wall tubes is significant for design of marine piping system. The author has performed an experimental study on friction loss of air-water two phase flow with vertical rough wall test tubes. The objective of the work is to obtain an empirical equation of friction loss of two phase flow in rough wall tube with a new arrangement method. Three empirical equations of friction loss have been obtained in the region of gas quality x=10-5-10-2. The friction loss of two phase flow in rough wall tube is arranged well with a factor F=Rel Kn Xm⋅ Rel is Reynolds Number and K is a wall roughness factor. The exponent m is 1/4 and n is 1/3, 1/9 and 1/46 in the range of x=10-3-10-2, 10-4-10-3 and 10-5-10-4, respectively. The result of Chisholm who used horizontal rough wall tubes is also arranged well with the factor. The effect of gas flow rate on the friction loss of two phase flow in rough wall tube is almost as same as that in smooth wall tube.
    Download PDF (1180K)
  • [in Japanese]
    1994 Volume 29 Issue 10 Pages 729-735
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (2836K)
  • Tadahiko Hara, Toyoaki Furukawa, Katsuhiko Shoda
    1994 Volume 29 Issue 10 Pages 736-740
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    In recent years, new type main engines which have long stroke slender shaft have appeared. Because of the softness of the new engine shaft system, torsinal, axial and bending vibrations are coupled together, and the vibrations are complicated and influenced to the vibrations of the engine room and the ship hull.
    We have developed a vibration analysis by using Building Block Approach, which have some merit for countermeasure of vibration reduction, and comfirmed the accuracy compared with the actual ship measurement data.
    Download PDF (480K)
  • Kenji Matate
    1994 Volume 29 Issue 10 Pages 741-745
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Searing machine for sheet is demanded for high accuracy on shearing size and form. So it's i mportant to find crack and bad sharpness of knife as soon as possible. Traditionally operators have caught cracks and bad sharpness of knife on trouble by their feeling so there are many errors and oversight that cause defect. This report shows shear condition diagnostic technology applying neural network for finding crack and bad sharpness of knife.
    Download PDF (1756K)
  • Harukuni Matsuyama, Mitsuru Mizuuchi
    1994 Volume 29 Issue 10 Pages 746-750
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    In this paper, we study the control of painting robot manipulators with elastic joints. Flexibility in harmonic drives causes the arm top vibration which suffers the painting accuracy. We use the singular perturbation method for the control of this vibration. The effectiveness of this control system is demonstrated in the numerical simulation and experimental reuslt.
    Download PDF (1922K)
  • [in Japanese]
    1994 Volume 29 Issue 10 Pages 751
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (1919K)
  • [in Japanese], [in Japanese]
    1994 Volume 29 Issue 10 Pages 752-756
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (763K)
  • [in Japanese], [in Japanese]
    1994 Volume 29 Issue 10 Pages 756-761
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (2463K)
  • [in Japanese]
    1994 Volume 29 Issue 10 Pages 761-766
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Download PDF (3926K)
  • Kunio Shimoyamada, Shoichi Iwamoto, Tomoaki Kodama, Yasuhiro Honda, Ka ...
    1994 Volume 29 Issue 10 Pages 767-776
    Published: October 01, 1994
    Released: May 31, 2010
    JOURNALS FREE ACCESS
    Experimental Approach to Additional Vibration Stresses Occurring on Crankshaft of High Speed Diesel Engine
    This research paper is considered on vibration stresses occurring on the crankshaft of Vee 10 cylinder diesel engine by experimenta 1 approach. The problems of vibration stresses in this case can be pointed out as follows;
    (1) Torsional vibration stress caused by considerable torsional vibration.
    (2) Bending stress caused by bending vibration coupled with the considerable torsional vibration.
    (3) Bending vibration stress caused by the lighter weight of crankshaft.
    (4) Bending stress caused by the weight and acceleration of piston and balance mass
    (5) Bending vibration stress caused by accuracy for setting of crankshaft center line.
    Download PDF (918K)
feedback
Top