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Volume 33, Issue 12
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[in Japanese]1998 Volume 33 Issue 12 Pages 829-836
Published: December 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSDownload PDF (3188K) -
Shuji Ishihara, Naohiro Tanaka, Tatsuhiro Jibiki, Kenzo Miura, Akio Ta ...1998 Volume 33 Issue 12 Pages 837-847
Published: December 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSTitanium alloys of which the strength ratios are higher than those of steels, are respected for the materials of deep water riser. One of the problems applying titanium alloys to riser is how to estimate their erosion characteristics in mud water containing barite.
In this study, we made erosion test equipment which modeled the fundamental part of actual riser. Using the test equipment, effects of the composition of mud water and flow rate of mud water on erosion damage for titanium alloy with and without surface modification treatment, were discussed.
The results of the erosion test showed that the erosion damage of titanium alloy decreased to less than 1/20 of steel. It was found that the titanium alloy possessed good erosion resistant characteristics, and surface modification treatment was not necessary.View full abstractDownload PDF (9458K) -
Sadanao Rikiyasu, Nobukazu Shimada, Hajime Yoshida1998 Volume 33 Issue 12 Pages 848-853
Published: December 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSIn the engine room area, there are many pipe lines of inflammable oil, and the exhaust pipes from an engine, a super-charger, too. If the leakage of the spray from the former pipe lines drops on and contacts with the high temperature surface of the heat insulator of the latter pipes, the oil will often self ignite and cause a fire.
A purpose of this research is to confine the self ignition temperature within narrow limits for marine diesel gas oil and A heavy fuel oil, contain various kinds of hydrocarbon, in the case of dropping oil on high temperature surface. We reported the results of gas oil last year, for A heavy fuel oil, we took place the experiment, too. Comparing the experiment data of both oils, it is confirmed that gas oil cannot ignite certainly at temperature below 337 °C and A heavy fuel oil below 386 °C, on dropping volume 0.04cm3-0.3cm3. The boundary of self ignite and not self ignite for A heavy fuel oil is higher temperature than gas oil.View full abstractDownload PDF (2055K) -
Osami Nishida, Hirotsugu Fujita, Wataru Harano, Takahito Okamoto, Youh ...1998 Volume 33 Issue 12 Pages 854-863
Published: December 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThis work was concerned at the oxidation of soot. An experimental study was made of two-dimensional visualization on soot particles and OH in diffussion/premixed flames by laser sheet. The soot volume fractions were obtained from the scattered light intensity of the soot by LLS (Laser-Light Scattered) method. OH distribution was measured by Planar Laser-induced Fluorescence (LIF) method. Quantitative laser measurements of OH in the zone of soot oxidation was made difficult by the presence of soot particles, which induced partial extinction and elastic scattering of the laser radiation. To improve the accuracy of the OH fluorescence signal, the spiked noises were reduced by the average of 25 shots measurements.
Along the flame' s axis and radial distance, profiles of OH and soot concentrations were obtained over the zone where soot oxidation took place. The peak of the soot concentration was located just inside the position of the OH concentration peak (flame front), which indicated that soot was produced in the fuel rich region near the peak of the OH concentration. When the OH concentration was raised, the soot burnout rate increased.View full abstractDownload PDF (5807K) -
Ping Sun, Hiroshi Okada1998 Volume 33 Issue 12 Pages 864-867
Published: December 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThere have been much interest in the use of vegetable oils as diesel fuel since they are renewable energy source and the CO2 emission is low. This paper describes the development of a diesel engine running on rape seed oil. The influences of fuel properties on engine combustion and the adaptability of combustion system to fuel are analyzed. The characteristics and performances of a new high speed multifuel direct injection diesel engine are explained in detail.View full abstractDownload PDF (548K) -
Shuhei Mizuhara, Motomu Kunimitsu, Osamu Beppu, Motoyuki Takahashi, At ...1998 Volume 33 Issue 12 Pages 868-877
Published: December 01, 1998
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThe world's first ADD30V medium speed diesel engines were produced and delivered for marine and stationary applications by Mitsui Engineering & Shipbuilding Co., Ltd. under the license of ADD Inc., Japan.
This engine achieves extremely high power with B.M.E.P up to 2.7MPa and mean piston speed up to 12m/s, coupled with light weight and space saving compactness. In addition, high reliability as well as low fuel oil consumption is obtained.
This paper describes the design features of principal components, such as the welded integral engine frame of steel modules, the crankshaft with cold-rolled fillets coupled with induction hardening, the piston of diffusion-bonded integral, the cylinder liner and the piston rings coated with wear-resistant ceramic, the singlevalve gas exchanging system, etc., which enable the ADD30V engine to achieve the above advantages under the extremely high power.
Finally, the engine performance and the operating results are described on the basis of actual test results.View full abstractDownload PDF (8921K)
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