Soot particles in flames are remarkably important as a means of increasing the radiant emissivity to enable the combustion energy of the hydrocarbon fuel to be transferred more rapidly from the flame to the surface to be heated in the combustors.
From the point of view of smoke emission from stack however small soot particles are easily injected deep into the respiratory system, they are greatly hazardous to human health.
The understanding of the soot particle size and concentration in flames are necessary to predict the problem both to flame radiation and to air pollution.
In support of this work, we believe that light scattering technique is one of advantageous methode. The main subject of this paper are to basic investigate the calculated scattered light intensities at various angles from the incident beam with the predictions from light scattering theory for spheres due to G. Mie and to try a preliminary experiments by water suspensoids of polystyrene latex particles having diameter of 0.091 and 0.176μ.
The results obtained are as follows:
(1) Good agreement between experiment and Mie's theory is found, when concentration of water suspensoids of polystyrene latex particles and diameter of the particle size are changed under the condition of the fixed incident beam (He-Ne Laser) .
(2) For determining the soot particle size and concentration in flames, it is advisable to use the measured scattered light intensities [S₂ (γ) /S₁ (90°) ] at various angles which corresponds to the computed values of [I₂ (γ) /I₁ (90°) ] .

抄録全体を表示

Measuring method of heat transfer in coolers and heaters of Stirling engine, where working gas flow is substantially in unsteady state, was devised and applied to the Stirling engine made for basic experiments. This method is based on measuring enthalpy variation between inlet and outlet of a cooler or a heater with high response resistance thermometers. A set of six thermometers of thin tungsten wires (5μm in diameter and about 15 mm in length) was prepared and installed in the Stirling engine where helium or nitrogen gas was used as working gas. Heat transfer coefficients between heat transfer surfaces of a heater/a cooler and working gas were measured. The obtained heat transfer coefficients show rather smaller values at small Re number range compared with the calculated values by using equations for steady flow by Hausen, et al. The obtained cyclic variation curve of working gas temperature within the expansion cylinder is not similar to the sinusoidal curve that has been presented by various computer simulation studies, but is similar to a saw tooth curve.

抄録全体を表示

The latest application of high-power ultrasonic homogenizer system for oil-burning with boilers and diesel engines is extremely useful in fuel oil saving and clean combustion. The high-frequency thyristor inverters as its controlled power supply have been special interests on the basis of superior characteristics - low cost system, high-power output adaptability, maintenance free and so on. Among many types of high-frequency thyristor inverters, the reverse-conducting thyristor type of series-resonance inverter is disposed to be used for the remarkable features described below.
(1) Decreasing the thyristor forward voltage is possible and the reverse voltage across the thyristor is nearly zero.
(2) Output voltage characteristics is relatively good.
(3) The distortion factors of output current and voltage are small.
Accordingly this power-supply system is successfully for the usage of high-resonance sharpness of the series tuned circuit such as ultrasonic transducer systems. Analysis and design of the proposed power-supply by thyristors, connected some inductances in series with thyristors, are described by considering the current-overlapping commutation mode. This paper mainly describes the approximate analysis of high-frequency inverter type of ultrasonic generator by reverse-conducting thyristor, and explains the performance evaluations and the design procedures.

抄録全体を表示

The retractable c.p. impellered thruster developed this time is so mechanized that it shall be put out of the hull bottom into seawater with freely controllable thrust and the direction of the thrust at any rotated direction by 360 degree. The thruster can be said effective as self-propulsive propeller for ship's running at low speed in case of necessity or as dynamic positioning apparatus for oil rig operating in the deep sea.
As the basic experiments, using the model thruster prepared, systematic experiments were carried out in the model basin, and the data required for designing the retractable thrusterr were obtained. On the other hand, the sea trial using the prototype thruster were carried out for confirming its retracting, rotating and pitch controlling characteristics. Thus, the technical information necessary for the application of the thruster to the ship were successfully obtained.

抄録全体を表示

Recently instrumentation piping works have been covering a wide range according to the progress of shipboard automation. Shipyards, however, have not yet completed to standardize the fitting practice and are leaving most of these to the spot.
The matters that demand special attention on the fitting, the materials used for instrumentation piping, etc. are put together in this fitting practice to the useful form on the base of the research materials discussed by the Machinery Plant Committee Group 3, laying great emphasis on the instrumentation piping diagram of control equipments which are used commonly for diesel ships.

抄録全体を表示

The disposition of petroleum was managed to sulphuric ash used of sulphuric acid and to watery solution, vanadium and nickel contents contained in it were analyzed by the apparatus of Anodic Stripping Voltammetry (ASV) used of Hanging Mercury Droped Electrode (HMDE) .
The number of analytical sample used in this experiment was 6 crude oils with different values of vanadium and nickel contents and 2 lubricating oils that contained obstructing-ion of zinc and other substance.
From the results, it was proved that: -
(1) Vanadium and nickel contents in crude oil could be analyzed at the same time when iron oxidized substance was not recognized to coexist together in oil.
(2) Vanadium and nickel contents in crude oil could be analyzed each separately by treatment with Fe-EDTA masking when iron oxidized substance was recognized to coexist together in oil.
(3) Nickel content in oil could be analyzed but vanadium content could not be analyzed if zinc content exists rather in excess.
(4) Accuracy of repetition in this measuring method was under 0.02 ppm of vanadium content and under 0.03 ppm of nickel content, and this method gave fairly good agreement with JPI experimental results.

抄録全体を表示