The face pattern method is considered to be preferable for marine engine monitoring because it is suitable for understanding correlations of multi-variates at a glance and noticing their delicate changes in details. This report deals with a study of application of the face pattern method to the condition monitoring of marine engine systems. Features of the face pattern display are analyzed experimentally and appropriate assignment of state variables of marine engine performances to variables for drawing face patterns are found for the condition monitoring. The state variables in abnormal states of a marine turbine plant system and a diesel one are displayed on a cathod ray tube by the face pattern method.
In the 1st report, the theoretical comparison of performance of various types of the Stirling engines and experimental work on the single acting L-type Stirling engine with atmospheric air as a working fluid were reported. From the 1st report, following results were obtained; 1) by the theoretical comparison, the output is decreased exponentially when dead volume ratio “a” is increased and the Inverted T type engine shows the best performance when “a” has same value for each type, 2) by the experimental results, regenerator material sizes (three kinds of diameter of steel balls were used) and the phase angle affect very much on the output performance of the engine. In this report, with the Inverted T type Stirling engine as shown in Fig. 1, the effects of the temperature of the working fluid in the expansion cylinder, various types of the regenerator material, kinds of the working fluid and the size and the number of piston rings on the output of the engine were investigated experimentally. Main results from this study are as follows; 1) fluid loss caused by reciprocating flow of the working fluid between the hot cylinder and the cold cylinder is proportional to the molecular weight of the working fluid and to the n-th power of the engine speed, 2) remarkable improvement in the engine output is obtained by use of thin piston rings (the thickness×height=1×3mm, the number of rings=15) instead of thick piston rings (6×7mm, 4) .
To prevent marine pollution by oils discharged from ships, the evaluation of the practical performance of oil content meters has been required and the international specifications of the performance test for the meters have been recommended by IMCO. In the paper, the technical method for supplying oil-water mixture of the specified concentration to the meters was investigated. The characteristics of the oil contents in the mixture supplied by a test equipment were obtained. The technical measures to get the small fluctuation in the oil contents were as follows: a) The homogenizing power was kept high enough to disperse highly viscous oil into water phase. b) The mixing effect was improved by providing the test equipment with adequate tank volume and circulating flow. c) Plunger pump was used for supplying oils, and pulse in oil flow was absorbed by air-damper. d) The inner diameter of oil injection needle was made small to get fine oil droplets. e) The high flow rate was maintained to drive the oil pump in higher range of the oil flow rate. The fluctuations in the oil contents were between 3.2% and 14.3% of the mean values for three kinds of oils.
The outline of development on atomic ice breakers in USSR is briefly described from “Lenin” to “Arktika”. The design features of steam turbines for atomic ice breakers, are summerized by means of performance tables, sectional drawing and general arrangement, which were published in USSR's books and technical journals.
Recently, marine fuel quality has been deteriorating. Consequently, many engine troubles due to low quality fuel have been increasing. In this article, the present writer describes only about troubles of oil heaters caused by low quality marine fuel. According to the investigation carbonaceous deposits on the fuel side of the heater and corrosion of heat transfer pins were remarkable. Our investigation revealed that clogging troubles caused by deposits on the fuel side surface have suddenly increased since around 1977. According to the recent data in case fuel additives were added to the bunker fuel, deposit troubles have remarkably decreased. As the original material of the Sun Rod oil heater pin had been copper, corrosion sometimes occurred on the copper pin. Since the maker changed the material to aluminum, very few corrosion has occurred. Marine fuel quality will gradually further deteriorate in future, as well. Accordingly, the troubles are likely to occur more frequently. The most important thing, among other things, for the maintenance of fuel oil heaters is to develop the chemical detergent capable of cleaning up carbonaceous deposits on the heating surface. Unfortunately at present no effective detergent solving the troubles are available on the market, therefore the development of such detergent for chemical cleaning are keenly desired.