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Successor
Volume 11, Issue 9
Displaying 1-7 of 7 articles from this issue
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[in Japanese], [in Japanese]1976 Volume 11 Issue 9 Pages 682-689
Published: September 01, 1976
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSDownload PDF (4036K) -
[in Japanese], [in Japanese]1976 Volume 11 Issue 9 Pages 690-695
Published: September 01, 1976
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSDownload PDF (2547K) -
[in Japanese]1976 Volume 11 Issue 9 Pages 696-703
Published: September 01, 1976
Released on J-STAGE: May 31, 2010
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Hiroyuki Hiroyasu, Toshikazu Kadota, Mitsuru Shoda1976 Volume 11 Issue 9 Pages 704-710
Published: September 01, 1976
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSA mathematical model was developed for predicting the heat release rate in a 4-cycle medium speed diesel engine. In the model, it was emphasized to predict the fundamental processes occurring in the combustion chamber, which varied with time and space, from the microscopic point of view. The prediction was based on the knowledges concerning a single droplet as well as the droplet size distribution in a fuel spray and the spatial and temporal distribution of fuel in a combustion chamber. The heterogeneous field of temperature and equivalence ratio and uniform pressure were postulated. To describe the heterogeneity of spray combustion, the spray was divided into, a lot of small packages which experiences different histories of temperature, pressure and equivalence ratio. And the processes occurring in the packages were synthesized to predict the one in the entire spray. The prediction is consisted of the following topics: fuel injection simulation, spray formation, droplet size distribution, droplet evaporation, ignition delay and heat release. Sample calculation were made for 40cm bore and 48cm stroke supercharged marine diesel engine with different load.View full abstractDownload PDF (1073K) -
Tominori Yamada, Etsuzo Tsuzuki1976 Volume 11 Issue 9 Pages 711-717
Published: September 01, 1976
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSFor analysing gear noise, power spectrum has mostly been employed hitherto. It is well known, however, that characteristic sound for human auditory sense, caused by a projected material on the surface of a tooth of gear or cyclic hum produced from gear box under running, for example, can not be expressed objectively by such a method only.
Authors suggest that much more informations might be obtainable by observing the variation of spectrum components with the time passing by, and introduce in this paper some experimental analyses expressed by spectrographic display, so-called “sound-spectrograph or voice print”, and a comparison with ordinary spectrum analyses. Examples presented here are noise of running gear in normal condition, noise of running gear when a tooth was injured by putting some material, cyclic hum of reduction gear, and noise of running epicyclic gear.
As a conclusion it can be said that the results by this analysing method, having been developed mainly for recognition of voice, revealed that lot of informations could be obtained about running conditions of gears, and that it was possible to open up a new field in detecting any abnormality of gears.View full abstractDownload PDF (3658K) -
Björn Edenhammar1976 Volume 11 Issue 9 Pages 718-723
Published: September 01, 1976
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThe last few years of discussion about the selection of propulsion machinery has been focused on the diesel, having the lowest fuel consumption. A more careful consideration of the factors behind the low figures shows, however, that the reheat steam plant is also very competitive with the higher fuel prices. For the largest groups of ships, it is even superior in total oil costs for powers down to 10 MW (13 600 SHP) . Considering all the major factors included in a life cycle cost of a tanker, the reheat steam plant offers a significant economic advantage for powers above 10 MW which increases up to some 7 per cent for the largest vessels.
It is our belief that the present optimum steam plants have restored the competiveness to a pre-crisis level, and that the feasibility is also good for smaller ranges than previously.View full abstractDownload PDF (673K) -
Gunnar A. Larsen1976 Volume 11 Issue 9 Pages 724-728
Published: September 01, 1976
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSSteam turbine propulsion plants based on the present optimum reheat cycle (5CR) are fully compatible with diesel machinery for most ship types and power ranges.
However, this is still of limited satisfaction, as the steam turbine plant has a high potential for further development. Techno-economic evaluations indicate considerably better fuel rates.
The use of steam turbines in combination with other machinery opens interesting aspects and offers very good fuel economy.
The present paper deals with the possibilities of further development through the use of advanced technology, which may find application in the medium to long-range perspective.View full abstractDownload PDF (595K)
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