巻号一覧
前身誌
20 巻, 100 号
選択された号の論文の12件中1～12を表示しています
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矢木 栄1954 年 20 巻 100 号 p. 789-790
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (479K) -
泉 亮太郎1954 年 20 巻 100 号 p. 791-796
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーIn the present paper, the author tried to study experimentally the heat transmission from a rotating disk to the ambient still and moving airs. Two experimental formulas are derived from several experiments ; The first one is for the case of natural heat convection and the other, the forced convection. For the former case, the results are compared with C. Wagner's theory of rotating disk and the author's experimental result of vertical plate, and for the latter case, as similar as the author's result for the case of infinite cylinder, the mean Nusselt's number Num is represented to the Reynolds's number Re and the Reynolds's number due to rotation Rer on the logarithmica coordinates. In conclusion the author expresses hearty thanks to Prof. Dr. Y. Tanasawa of Tohoku University for his kind leadership.抄録全体を表示PDF形式でダウンロード (776K) -
村川 勝弥1954 年 20 巻 100 号 p. 797-802
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーThis is necessary for the separation of gas by the utilization of difference of specific weight, but there is no study about this. Theoretical analysis and experiment were conducted, and in the theoretical analysis, equations of hydrodynamics were solved under 8 boundary conditions, and energy equation was reduced to Fredholm's integral equation of the 2nd kind and solved, under general surface-temperature-distribution of pipe-walls. Numerical calculation was accomplished using the results of experiment, and the solution was found coincided with experimental data.抄録全体を表示PDF形式でダウンロード (689K) -
菅原 菅雄, 吉川 進三1954 年 20 巻 100 号 p. 802-808
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーMany investigations have already been made on the effects of the working conditions of steam on the thermal efficiency of reheating cycle. However, it has been made possible to use much higher temperatures and pressures of steam than former times in consequence of the development of metallic materials In this paper, we have theoretically investigated the thermal efficiency of reheating cycle mainly in the range of high pressures and high temperatures. At first, the theoretical thermal efficiency of reheating cycle was calculated for the various working conditions of steam, and next, we investigated the effect of thermodynamic efficiency of turbine on the thermal efficiency of the cycle, especially considering the effect of the wetness in low pressure stages of turbine. Lastly, we investigated the results of this research comparing with the recent literatures.抄録全体を表示PDF形式でダウンロード (1025K) -
西川 兼康1954 年 20 巻 100 号 p. 808-815
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーThe reason why the data on the boiling coefficient of heat transfer disperse, is owing to the surface phenomena that the number of vapour columns would be influenced by both surface conditions of the heating surface and properties of liquid, and that the heat transfer to boiling liquid is closely related to the column number. The column number should depend on various factors such as heat flux, surface roughness, surface contamination, properties of liquid, etc. In this paper the effect of surface roughness on heat transfer in nucleate boiling is treated. The experiments were carried out with distilled water boiler on the horizontal heating surfaces, fitted with various shapes of concentrica grooves of triangle cross section. It was found that the mean height was adequate to the scale of roughness on the boiling heat transfer. Further, by introducing a new "coefficient of foaming" which represents the foaming ability of both heating surface and boiling liquid, experimental formulae on the heat transfer in the nucleate boiling were derived.抄録全体を表示PDF形式でダウンロード (1695K) -
大塚 貞吉, 服部 久雄, 沢井 定, 竹内 郁夫1954 年 20 巻 100 号 p. 815-821
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーLow calorific gas-blast furnace gas, blow gas from water gas producer, bone coal gas and underground gasification gas etc. -will are considered the promising one among the fuel applicable for the stationary gas turbine, but if these gases are burned under high heat release, unstable and incomplete combustion is liable to occur. In this experiment, the concentric burner in which fuel gas and air swirled contrariwise each other and cylindrical combustion chamber (inner diameter=64mm) made of fire brick were installed, thus changing air-excess ratio, combustion chamber heat release and preheating temperature. the combustion experiment was made using the fuel gas which was equivalent to blast furnace gas. Though the factors of limiting combustion chamber heat release of combustor are the happening of unstable combustion and of incomplete combustion in case of large excess air, stable combustion was possible to the combustion chamber heat release of 7.00×105 kcal/m3 h without preheating in this combustor, and preheating fuel gas and air to the limit of stable combustion was not spreaded so much, but it was recognized that whole combustion velocity was promoted extremely by increasing the velocity of chemical reaction.抄録全体を表示PDF形式でダウンロード (1003K) -
服部 久雄, 小泉 睦男, 佐々木 武1954 年 20 巻 100 号 p. 821-826
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーAuthor discovered a new experimental method to measure the flame propagation velocities of the mixture of pulverized coal and air. In this method, the coal-air mixture is fed into the open atmosphere as free-bounded flow, in which centre a small C2H2 gas flame is plecad as ignition flame, so that the steady flame-front of inverted cone shape may be formed in the mixture due to the balance of flame propagation velocity and flow velocity. Author proposed also a theoretical formula to induce flame velocity from flow velocity, cone angle and density drop at flame-front. With the above method the following themes are studied : (1) the relation of ignition burner flow rates to flame velocity, (2) the relation of mixture flow velocities to flame velocity, (3) the relation of pulverized coal concentration to flame velocity and. (4) the relation of grain sizes of pulverized coal to flame velocity. As a result of studv of (1) and (2), it has been found that, the ignition flame size and mixture flow velocity have little effect on flame velocity, and the above formula are proved right. On the other hand, coal concentration and grain sizes have much effects as follows : The mixture has maximum velocity at its proper concentration as gas mixture does, and flame velocity increases as grain size decreases.抄録全体を表示PDF形式でダウンロード (922K) -
小林 清志1954 年 20 巻 100 号 p. 826-831
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーIn the present paper, an attempt is made to find the surface temperature of evaporating droplet theoretically and experimentally. The measurement was done, elliminating the effect of the thermocouple by the extrapolation of the relation between the apparent surface temperature and the length of the thermocouple which was a fine copper-constantan wire with a droplet of 1∼2 mm in diameter on its one contact point and with a cooling jacket around another contact ponit being kept at the same temperature as that of the droplet surface. The theoretical values were compared with the measurements, and some considerations for the difference between them and also for the results were taken.抄録全体を表示PDF形式でダウンロード (833K) -
小林 清志1954 年 20 巻 100 号 p. 831-837
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーIn the present paper, an attempt is made to study the evaporation of a single liquid droplet hanged by a quartz fiber, by means of recording on motion pictures. The evaporation of twelve pure liquids, five blends and petroleum fuels namely, water, methylalcohol, ethylalcohol, benzene, toluene, nitrobenzene, cyclohexane, n-hexane, n-heptane, iso-octane, cetane, α-methylnaphthalene, water-methylalcohol blend, motor gasoline, kerosine, diesel light oil. and heavy oil, was studied. As the derivative of the square of the diameter of the droplet with respect to time is constant value for pure liquid and it is satisfactorily proved that the life of the droplet is proportial to the square of its initial diameter for blends or petroleum fuels, it may be convenient to represent the rate of evaporation velocity by that constant which may be called the "coefficient of evaporation velocity of droplet." The results were compared with the theory(9), and satisfactory agreements were obtained between them.抄録全体を表示PDF形式でダウンロード (1252K) -
小林 清志1954 年 20 巻 100 号 p. 837-843
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーThe work described here is an attempt made to investigate the combustion process of a single fuel droplet hanged by a quartz fiber by means of recording on motion pictures, for fifteen liquid fuels namely, methylalcohol, ethylalcohol, benzene, toluene, nitrobenzene, cyclohexane, n-heptane, iso-octane, cetane, α-methylnaphthalene, motor gasoline, kerosine, diesel light oil, heavy oil A, and heavy oil B, as a succession to the previous study on the evaporation of a single liquid droplet. The "coefficients of combustion velocity of droplet" for various kinds of fuels were measured, The mechanism of the ignition of the droplet was made clear. Heavy oil droplet burns with frothing and splashing of burning viscoue residue which in turn produce secondary splashes. It was made clear that such frothing and splashes were caused by the bubbles and their bursting produced by the thermal cracking, according to the corresponding experiments in the high temperature nitrogen in which they were also observed.抄録全体を表示PDF形式でダウンロード (1707K) -
長尾 不二夫, 平子 善夫, 荻野 周雄, 久光 脩文1954 年 20 巻 100 号 p. 844-850
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーIn the combined operation of the engine and turbocharger, there exsists a certain relationship between charging pressure, turbine inlet pressure and temperature, excess air ratio, engine speed and mean effective pressure. If one of them varies, all the other factors vary automatically until a balance is again achieved. In this paper, the performance of a constant speed engine is calculated by graphical solution of the simultaneous equations, which are deduced from the relations exsisting among these operating variables, on the assumption that the turbine is a steady-flow type.抄録全体を表示PDF形式でダウンロード (903K) -
浅野 弥祐1954 年 20 巻 100 号 p. 850-854
発行日: 1954/12/20
公開日: 2008/03/28
ジャーナル フリーWhen it is operated with a suction type carburetter, The pressure ratio of a centrifugal supercharger becomes larger when operating with a suction type carburetter than when it is operated without it. This increase of pressure ratio is known to be the effect of fuel evaporation before and in the supercharger. This paper deals with a thermodynamical consideration of the problem, and the pressure ratios for various rates of fuel evaporation are calculated. As a result of the analysis, it is shown that the pressure ratio is maximum when the fuel evaporates completely before entering the supercharger, and is minimum when the evaporation does not occur at all before or in the supercharger, all fuel passing through it as droplets.抄録全体を表示PDF形式でダウンロード (710K)
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