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30 巻, 213 号
選択された号の論文の8件中1～8を表示しています
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渡部 公明1964 年 30 巻 213 号 p. 585-593
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーExperiments on a rotating grooved disc in a closed grooved vessel, were carried out with various clearances, especially very small axial clearances, and over wider range of Reynold's number. From these results the effects of axial clearance S, pitch p and depth T of grooves on the resisting coefficient are determined as follows : (1) When the axial clearahces are very small and the surfaces are smooth, resisting coefficient Cf is in proportion to R6-5/6in larminar flow region, and to Re-1/4 in turbulent flow region, and independent of Re in transitional region. (2) Cf takes a minimum value at S/d≒0.0066, where d is the disc diameter, irrespective of the exsistance of grooves. In general, grooves have little infiuences on S/d. (3) Cf of smooth or grooved disc. in grooved vessel takes a minimum value, when p/d= 0.088, T/d=0.0066. The combination of a smooth disc and a grooved vessel is desirable in order to decreases Cf in larminar flow region. On the other hand, in turbulent flow region, the combination of a grooved disc and a grooved vessel is prefered.抄録全体を表示PDF形式でダウンロード (1199K) -
葛原 定郎1964 年 30 巻 213 号 p. 594-597
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーFalling, rolling or sliding motion and the descending velocity of a grain of gravel in rest water in a vertical or inclined smooth pipe were investigated. The diameter of the grain was about 1∼5 mm, and the pipe was of a transparent hard vinyl, 38.5 mm in inner diameter. The formula which expressed the descending velocity considering the shape of the grain was theoretically established. From this formula and the experimental results, the kinetic coefficient of friction between the pipe wall and grain in the case of rolling or sliding was calculated. The static coefficient of friction was also measured and compared with the kinetic one. As a result, it was found that the frictional character of the pipe wall was similar to that of brass, and the sliding or rolling coefficient of friction showed respectively about one half or one third of the static coefficient抄録全体を表示PDF形式でダウンロード (540K) -
鳥居 脩1964 年 30 巻 213 号 p. 599-605
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーIn order to obtain the exact and stable characteristic curve of the wet vacuum pump, a system to control precisely the supplement of piston water is devised, and the comparative studies on the various eccentricities of the casing are performed experimentally. The experiment reveals the following : (1) The critical rate of supply water (qe), required for the continuous characteristics, decreases with the increase of the speed of the runner, and with the decrease of the eccentricity of the casing. (2) The transition point (Hs maxt, Ust) exists on the curve showing the relation between the tip velocitv of the runner (Ua) and the maximum degree of vacuum (Hs max) adopted under qo, and the pump efficiency (ηis) becomes maximum under the velocitr increased a little from Uat (3) The most effective eccentricitt may be concluded as e/γa=0.20∼0.22, judging synthetically from the suction performance, effciency, etc.抄録全体を表示PDF形式でダウンロード (847K) -
藤本 哲夫1964 年 30 巻 213 号 p. 606-615
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーThe shock wave structure of chemically inert, binary gas mixture is studied in terms of the Mott-Smith method. The molecular velocity distribution functions of each species are assumed to be a sum of two equilibrium distribution functions which correspond to the up and down stream conditions. Four unknowns which are related to the number density are solved by using the continuity equations, 2nd order moment equations of Boltzmann equation and Rankine-Hugoniot's relation. Numerical results are obtained for Xe129-Xe132 mixture, and for Ne-Ar mixture, ranging from Mach number 2 to 10. The results show that almost no separation of component gases for Xe129-Xe132 mixture. Ne-Ar mixture shows the phase shift of number density distribution of each species in the shock wave.抄録全体を表示PDF形式でダウンロード (903K) -
植松 時雄, 安達 勤1964 年 30 巻 213 号 p. 616-623
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーContinuing from Part 1, the authors tried to explain the mechanism of flow fluctuation in the axial-flow fan, particularly of the component which has the frequency of (NZ)/60 c/s. The total pressure fluctuation in the neighborhood of the fan wheel is calculated according to : first, the potential theory and, then the results of the experiment of cascade. From these researches the following results have been obtained; (1) In front of the fan wheel, the mechanism of flow fluctuation is explained by the theory. (2) In back of the fan wheel, the mechanism of flow fluctuation is not explained by the theory, but is explained by the results of the experiment of cascade.抄録全体を表示PDF形式でダウンロード (946K) -
赤木 新介1964 年 30 巻 213 号 p. 624-634
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーThe heat transfer by free convection in viscous oil is practically important for the design on the tank heaters of an oil tanker etc. The free convective phenomenon in oil is different from that in other fluids with constant properties, since oil has viscosity which depends sensively on temperature. However, few studies have been given to these kinds of problem. This paper deals with the theoretical analysis of the free convection in oil. The numerical solutions of the basic equations are given to a horizontal tube and a vertical plate in wide range of Prandtl numbers and wall temperature on a digital computer. And the effect of variable viscosity is discussed. Finally, the formulas for Nusselt number are presented for the case of the heat transfer in oil.抄録全体を表示PDF形式でダウンロード (1258K) -
山本 充義, 玉置 琢磨1964 年 30 巻 213 号 p. 636-644
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーIn open cycle MHD generators operated by combustion gas, only thermal ionization in equilibrium is employed to make the gas conductive, where initial temperature of working gas must be over 3000°C and the efficiency, when combined with steam turbine generators, is expected to be approximately 55%. On the other hand, in closed cycle systems operated by monoatomic gas, it is possible to use nonequilibrium conduction by elevating only electron temperature and to reduce the initial temperature of gas, alleviating the difficulties of high temperature materials. On these considerations, discussions were made on the overall thermal efficiency of a relatively low temperature MHD generator combined with a given steam power plant in connection with the effects of operating parameters of MHD generator, and it was concluded that at the initial temperature of about 2000°C it is possible to get almost the same efficiency with that obtainable at a higher temperature.抄録全体を表示PDF形式でダウンロード (1075K) -
長尾 不二夫, 池上 詢1964 年 30 巻 213 号 p. 645-653
発行日: 1964/05/25
公開日: 2008/03/28
ジャーナル フリーAn indicator passage is often oblized to be attached to the pressure sensing element in measuring cylinder pressure of an internal combustion engine. A vibration caused in the passage, however, often injures fidelity of pressure indicated. In this paper, the gas system inside the passage was firstly studied on the viewpoint of frequency-and transient responses, and thus the relationship between the course of pressure in cylinder and the pressure indicated was derived. Then the amplitude error due to the passage was evaluated by comparing the pressure diagrams obtained by the use of an passage, with accurate diagrams. From these, it was experienced that the diagram available for practical use was possibly obtained by raising the period of vibration twice as much as the rising time of pressure rise and by making the period lower than 2 to 3 degrees in crank angle. Further, damping effect of connecting passage or throttling was experimentally examined for improving the diagram accuracy, and an approximate formula was given to find out the optimum damping.抄録全体を表示PDF形式でダウンロード (1743K)
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