Transactions of the Japan Society of Mechanical Engineers
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
Search
Advanced search
OR
Browse
Search
Volume 23, Issue 128
Displaying 1-8 of 8 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Prospect for Japanese Automobile Industry
    Akira KAWAHARA
    1957 Volume 23 Issue 128 Pages 257-258
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.257
    JOURNAL FREE ACCESS
    Download PDF (418K)
  • Laminar Free Convection from a Horizontal Plate with Uniform Surface Heat Flux
    Ikuo MABUCHI
    1957 Volume 23 Issue 128 Pages 259-265
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.259
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The partial differential equations expressing the conservation of momentum, mass, and energy for the laminar free convection from a horizontal flat plate, having a finite thickness and length, were transformed into the ordinary differential equations, which were obtained for both the upper and lcwer surfaces of a horizontal plate. Also, it was demonstrated that the ordinary equations for the upper surface were equal to those obtained for the vertical plate, having uniform heat flux studied by E.M. Sparrow, but the equations on the lower surface had the different forms. The distributions of local heat-transfer coefficient and surface-temperature variations on both the surfaces, by considering a plate whose cross section is of a very thin ellipse, were calculated by means of Runge-Kutta's and von Karman-Pohlhausen's methods. It has been shown that the mean heat-transfer coefficient on the lower surface is affected by the thickness of the plate, and it is about 60% of that the vertical plate with same length, and that if mean Nusselt number for the plate with uniform surface heat flux is calculated by using the mean temperature difference over the surface, the results are very close to that for a uniform surface temperature plate.
    View full abstract
    Download PDF (850K)
  • On the Theory of the Combustion Rate of Liquid-Fuel Spray
    Yasusi TANASWA, Tunec TESIMA
    1957 Volume 23 Issue 128 Pages 265-271
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.265
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The rate of combustion of liquid-fuel spray injected into the combustion chambers of diesel or gas turbine engines is calculated in the following way : (1) As the distribution functions for the number and the weight of the sprayed drops are expressed generally by the equations (5) and (8), the experimental indices α and β have been determined for various injection nozzles and found to be α=-0.5∼2 and β=1. (2) Assuming that the combustion rate of the sprayed drops obeys the same law of the combustion of a single fuel droplet expressed in equation (9) and considering that the number of sprayed drops remains constant during combustion, the equation for the weight distribution of the sprayed drops are derived as (17) and (20), the graphical integration of which, up to the maximum diameters, gives the total amount of drops unburned. (3) Thus to amount of burned drops ωτ are given as a function of time t and the distribution indices α and β, the approximate formulae for which are given as (23) or (24).
    View full abstract
    Download PDF (1096K)
  • Some addenda on the Temperature Coefficient of Diesel Engine output Horse-Power
    Osamu HIRAO, Syozi OTAKA
    1957 Volume 23 Issue 128 Pages 271-273
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.271
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Examining the aspect of combustion processes in the diesel engine cylinder through indicator-cards, we can see the effect of suction-air temperature on the cards, even in light load operation such as the case where the excess air factor is 2∼3, when almost no effect can be felt upon its output horsepower. When we change the suction-air temperature keeping the fuel injection rate constant, the maximum explosion pressure in pre-combustion chamber varies almost proportionally to the quantity of air aspirated, which varies due to the suction-air temperature change. Namely it may be said, that the combustion process in the pre-combustion chamber of diesel engine cylinder is regulated by the quantity of air in it. This will be understood from the fact that even under the condition of light load when the excess air factor is about 3, the excess air factor in regard to the pre-combustion chamber alone will still remain about unity. Anyway, it may by said that the effect of the suction-air temperature upon the combustio
    View full abstract
    Download PDF (483K)
  • The Analysis of Gases within the Pre-Chamber of the Compression Ignition Engine (2nd Report)
    Hitoshi TAKAHASHI, Takeshi SANPEI
    1957 Volume 23 Issue 128 Pages 274-279
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.274
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    To discuss the concentration of CO2, CO, O2 and Hs in the pre-chamber, we adopted one plane that has co-ordinates of O2 consumed and CO+1.5CO2-0.5H2 in mole ratio, then data of gas analysis are ploted straightly passing throught the original point. We introduced these co-ordinates from the kinetics of the paraffine series oxidization and water gas reaction. Data of exhaust gases locate on the straight line that has an angle of inclination determined by the value of H2/C in mole ratio of fuel. The farther from the exhaust gas line mentioned, the lower the degree of combustion, But these co-ordinates can not determine the mechanics of incomplete combustion, mamely whether the oxidization of parafiine side chains mainly occur or solid carbons are produced.
    View full abstract
    Download PDF (755K)
  • The Characteristics of a Carburettor (1st and 2nd Reports) : On the Liquid Distribution and Atomization
    Shigeo ISHIGAMI, Yoshihiro TANAKA
    1957 Volume 23 Issue 128 Pages 279-285
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.279
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    On caburettors, to explain the distribution and the atomization characteristics of the discharged fuel, three horizontal flow pressure type carburettor models combined with three type discharge pipes are examined. And as a result the following have been obtained : - The position of the discharge pipe with the best distribution of the liquid, and the droplet size diagram with the rectangular axes of the quantity of the flowing liquid and that of the air bled in the liquid, showing the concaved surface, from which the condition of the smallest droplet size is to be found.
    View full abstract
    Download PDF (879K)
  • The Flow of the Mixture of Air and Water : II. The Relative Velocity in Horizontal, Inclined and Vertical Tubes
    Koji AKAGAWA
    1957 Volume 23 Issue 128 Pages 285-291
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.285
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In this paper are discussed the results of an experiment on the relative velocity between air and water flowing in a tube 5575mm long and 27.6mm in inside diameter placed at angles 0°, 30°, 60°, and 90° to the horizontal surface. The flowing rate was from 0.2 to 2.64m/s for water and from 0.1 to 1.6m/s for air in single phase flow. The results may be summerized as follows : 1) When the tube is at angles 0°, 30° and 60° to the horizontal, the relative velocity wγ increases in direct proportion to the air flow rate and in inverse proportion to the water rate. In some cases the relative velocity obtains negative values. 2) When the tube is vertical, wγ in creases with the air flow rate, the rate of increase being smaller for larger water flow rate. 3) wγ is influenced not only by the tube-inclination and the specific density of the mixture, but also by the water flow rate.
    View full abstract
    Download PDF (1336K)
  • The Flow of the Mixture of Air and Water : III. The Friction Losses in Horizontal, Inclined and Vertical Tubes
    Koji AKAGAWA
    1957 Volume 23 Issue 128 Pages 292-298
    Published: April 25, 1957
    Released on J-STAGE: March 28, 2008
    DOIhttps://doi.org/10.1299/kikai1938.23.292
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    1) Let ξ be the ratio of the actual friction loss of the two-phase flow to the friction loss obtained when the water alone flows through the tube, and also, let fw be the fraction of the water volume to the total tube volume. Then the following simple relation holds : ξ=fw-x, where Z is a function of the inclination alone and is from 1.4 to 1.9. 2) Let ψ be the ratio of the frictional coefficient of two-phase flow, as defined under consideration of the relative velocity, to the frictional coefficient of the single phase water flow. The ψ is a function of fw alone and falls in a range between 1 and 2. 3) The ratios ξ and ψ for the mixture of the saturated steam and water were obtained from the diagram by Martinelli and Nelson.
    View full abstract
    Download PDF (989K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top