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28 巻, 195 号
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星野 達郎1962 年 28 巻 195 号 p. 1441-1450
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThe author presents here a generalized discharge formula which can be applied to all kinds of the rectangular weirs. This formula has no restriction as to the width b and the value b/B, h/(h+D), and m=h/b (B : channel width, D : depth of weir, h : head). Consequently to weirs with any geometrical shape, i.e., for all weirs of b/B=0∼1, h/(h+D)=0∼1, m=h/b=0∼∞, and further to weirs having any dimension, this formula can give the coefficients of discharge respectively. Estimated discharge coefficients as well as experimental data of weirs for b=0.10, 0.05, 0.025m and for various values of B and D result in this genera1ized discharge formula. Excepting special cases of free overfall, small suppressed weir and full depth weir for b/B≒1, this formula gives discharge coefficients within ±1% error.抄録全体を表示PDF形式でダウンロード (1000K) -
沖 巌1962 年 28 巻 195 号 p. 1450-1461
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThis paper treats the result of experiment on a flat-seated disc valve named i having a diameter of 38.8 mm. The experiment was carried out in the same manner as in the cases of valves e (28.0 mm in diameter) and f (30.2 mm in diameter) described in the preceding paper (9th Report). Here the relation between the effective head and the characteristics of these three valves are studied collectively.抄録全体を表示PDF形式でダウンロード (1163K) -
上滝 具貞, 早野 延男, 新納 研一, 本松 清明1962 年 28 巻 195 号 p. 1462-1471
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThe two dimensional motion of granular particles flowing out from a vessel through a small slit is analyzed. After the several experiments, we were able to recognize the following facts : (i) It could be possible to say that we can recognize qualitatively the dynamical state of the materials by the aid of a so-called "moving state diagram". (ii) Granular layers can be divided into two parts; the one depends largely on the form of the opening at the bottom and the other depends rather on the intrinsic properties of the material itself. (iii) Average quantity of outflow varies with the width of the opening. (iv) In non-stationary (without charge of material during the operation) and in stationary cases (with continuous feeding of materials compensating for the lost quantity), the dynamical state of the particle in the vessel remains in the so-called "stationary state" and for a short interval at the beginning of the experiment it becomes a real non-stationary (transient) state.抄録全体を表示PDF形式でダウンロード (1528K) -
葛西 泰二郎, 高松 康生, 永田 徹三1962 年 28 巻 195 号 p. 1472-1479
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーA small, light-weight and high revolution (rated 16000 rpm) centrifugal pump with a booster was made for the experimental purpose and the performance test was carried out up to 11 000∼12 000 rpm the allowable speed of the test motor. In this report, authors showed the performances and charactristics of the pump, using coefficients for example. [numerical formula] According to the test result, it was clarified that the leakage and circulating water were decreased by the use of many radial grooves cut on the outside of impeller shroud, and the suction performance was considerably improved by the booster.抄録全体を表示PDF形式でダウンロード (1114K) -
箱守 京次郎, 棚沢 泰1962 年 28 巻 195 号 p. 1480-1489
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーTo clarify the fuel injection phenomena in diesel engines, not only the change of pressure, but also the variation of velocity at any point of the fuel supply line must be measured. So we have attempted to make a DC electromagnetic flowmeter suitable to record the instantaneous velocity with a high sensitivity under high pressure, using water as an alternative of fuel. After the examination of various causes which produce electrochemical noises, we have adopted the following system. (1) A new type of probe (pick up), which withstands the hydraulic pressure up to 500∼600 kg/cm2, has been developed. Two fine silver wires covered with thin co-axial insulators are inserted into the fuel pipe from the opposite side paying attention not to disturb the flow, and are used as the electrodes. (2) The electro-motive force induced by the velocity of flow and the strong magnetic field is amplified with a balanced circuit of 66∼90 db. (3) The input resistance of the preamplifier, in which grid current is limited under 10-12A, is taken between 60∼200 MΩ to prevent the polarization effect in the flow.抄録全体を表示PDF形式でダウンロード (1505K) -
矢野 巍1962 年 28 巻 195 号 p. 1489-1497
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThe centrifugal blower of diesel engine super-charger operates under pulsating flow at 10 to 70 cycles per second, therefore if the scavenging system is not properly designed, the flow through the blower decreases remarkably and so does the power of the engine. The pulsating flow test with the rotary valve has proved that the characteristics of centrifugal blower under steady flow condition are also available in pulsating condition. And we find that the graphical methods, taking into account the boundary conditions using steady flow centrifugal blower characteristics can be conveniently used. The equivalent length of the centrifugal blower is also determined by this test.抄録全体を表示PDF形式でダウンロード (1083K) -
山口 誉起1962 年 28 巻 195 号 p. 1498-1503
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThe supersonic cascade, in which a normal shock occurs and a flow is decelerated from supersonic to subsonic, is used in supersonic axial flow compressors. For cascades of this type, supersonic starting at the given inlet Mach number, high compression efficiency, larger deflection angles and thick blades enough not to be destroyed are required. Therefore it is considered to be hopeful that a blade section is divided into a supersonic part and a subsonic part, and the former gives most deflection angle to a flow and the latter gives little, consisting of straight surfaces. This report describes the method which dicides such a supersonic part of a blade section and the results of the analytical calculation about the obtainable deflection angles and compression efficiencies in the supersonic regions for the inlet Mach number from 1 to 2.抄録全体を表示PDF形式でダウンロード (836K) -
山口 誉起1962 年 28 巻 195 号 p. 1504-1511
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with the analitical method to obtain the directions of outlet flow of the subsonic flow down-stream a normal shock in the neighbouring blades of the two-dimensional supersonic cascade of which subsonic part consists of straight surfaces. This method first solves the problem for the corresponding invisid flow, and then applied its solution to the compressible flow by Karman-Tsien's method. According to the analysed results, the relation α-∞≥α+∞≥(1/2)α-∞ exists between the outlet flow direction α+∞ and the divergence angle of the subsonic part α-∞, and the outlet flow direction coincides with the tangential detection to the pressure side, when a normal shock occurs at the trailing edge of a blade. The more upstream a normal shock occurs in the subsonic region, the nearer the outlet flow direction turns to the suction side of the blade first rapidly and then slowly.抄録全体を表示PDF形式でダウンロード (784K) -
石沢 進午1962 年 28 巻 195 号 p. 1512-1523
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーIn this paper similarity conditions of the three dimensional boundary layer flows over bodies of revolution are examined and very general forms of the distributions of the main stream velocity, the radius of the body and the scale factor are found. First, when the fluid at infinity is axially symmetric and the body is rotating about its own axis, the distribution of the outer velocity and others which fulfill the similarity conditions are found to be of the power or the exponential forms. Secondly, when the body is at rest and the main stream has both the meridional and the circumferential velocity components, the general solutions are found to be entirely different from those of the rotating body and are not restricted to the power and the exponential form. Moreover, it is found that several different flow patterns correspond to one set of similarity constants.抄録全体を表示PDF形式でダウンロード (1277K) -
本間 端雄1962 年 28 巻 195 号 p. 1523-1532
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーTheoretically, the inside temperature of Ljungstrom-Type Air-Preheaters can be expressed in the form of a partial differential equation with location and time variables. So far the general solution and any powerful calculation method have not been found. The author utilized the difference equation technique for the location variables and eliminated the location terms by setting their increments to specific values. This partial differential equation was transformed into an asymptotic ordinary differential equation of the first degree with many variables, and its general solution was obtained. From the general solution, a convenient nomogram was made, which should enable us to calculate with ease the temperature distributions of gas, air, and of the conducting surfaces. This approximation method gave a good precision in calculation; errors fall within 1% in case of temperature efficiency calculation and the maximum error was about 2.5% in the inside temperature calculation.抄録全体を表示PDF形式でダウンロード (1138K) -
岐美 格, 松本 隆一, 穂積 正浩1962 年 28 巻 195 号 p. 1533-1542
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with an analysis to determine the heat transfer characteristics of thermal entrance region for established laminar flow of a heat generating Bingham plastic through a circular tube with wall heat transfer. The conditions of wall heat transfer treated in this paper are both the case of prescribed uniform wall heat flux and that of uniform wall temperature. In this analysis, Eigenvalues and Eigenfunctions are evaluated by means of digital computer KDC-1. The heat transfer characteristics approach those of fully developed region which were calculated in the previous paper by one of the authors(1). The results for a Newtonian fluid flow which were analyzed as a special case agree very well with those by Nusselt(5) and Siegel et al(6).抄録全体を表示PDF形式でダウンロード (957K) -
佐藤 俊, 松村 博久1962 年 28 巻 195 号 p. 1542-1550
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThere are many correlations on the saturated boiling, but few suitable correlations on the subcooled boiling heat transfer with forced convection. In this paper, the experimental results on the subcooled boiling heat transfer of water in the vertical rectangular channel with forced convection under the atmospheric pressure are reported and the correlation based on the experimental data is proposed, namely qt=qc+qb where, qt : total heat flux of the subcooled boiling with forced convection, kcal/m2h, qc : convective heat flux, kcal/m2h, qb : boiling heat flux, kcal/m2h, and for the condition at atmospheric pressure, qb=4.53ΔTsat3.6 The boiling heat flux qb is not affected by velocity and subcooling, but is dependent on the system pressure. The relation is represented by an equation as shown below on the basis of various experimental data of the subcooled boiling with forced convection which have been reported by previous investigators. qb=4.50eP/20ΔT<sat>3.5 where, P : absolute pressure of system, ata, ΔTsat : degrees of superheated, °C.抄録全体を表示PDF形式でダウンロード (1012K) -
長尾 不二夫, 太田 脩二, 井上 悳太, 高倉 稔, 茂木 良太郎1962 年 28 巻 195 号 p. 1550-1559
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーIn the previous papers the temperature rise due to throttling was applied to a starting aid in a four stroke cycle diesel engine and a crankcase scavenged two stroke cycle diesel engine. In the present paper the same phenomenon was applied to a two stroke cycle diesel engine with a scavenging blower. By releasing the cylinder pressure in the compression stroke with an automatic valve, pressure drop under the ambient can be obtained at the end of expansion stroke. When the exhaust ports open the air rushes into the cylinder, accompanying a considerable temperature rise. After scavenging the charge temperature is lowered, but higher than the scavenge air temperature at the beginning of compression. The calculated temperature rise reached 80°C before scavenging, however, when the delivery ratio was unity, it was reduced to 24°C at the beginning of compression, while the measured was l9°C. In the starting test the minimum cooling water temperature at which the engine could start could be lowered by 30°C in tbe range of small delivery ratio.抄録全体を表示PDF形式でダウンロード (1175K) -
石神 重男, 田中 義弘, 玉利 賢一1962 年 28 巻 195 号 p. 1560-1568
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThe authors studied the tracer gas method which had already been suggested to be an applicable method of measuring the trapping efficiency of two stroke cycle engines. And in consequence, the superioritv in both accuracy and possibility of reappearance under the following conditions of measurement was found : The use of anhydrous monomethylamine as the tracer gas ; gas density being 0.1∼0.3% ; the use of 10 cc of 0.02 normal solution of sulfuric acid as the absorbing liquid ; the type of sampling tube being as shown in Fig. 12 (a) ; a mixture of bromcresol-green and methyl-red as the neutralization reagent ; gas sampling points in Fig.5 (a) and Fig.5 (b) and the gas sampling apparatus in Fig.8. Under these conditions, the errors were within the range of ±2%. The accuracy was compared with the results obtained by the gas sampling valve method.抄録全体を表示PDF形式でダウンロード (1092K) -
石神 重男1962 年 28 巻 195 号 p. 1568-1577
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThe author studied the scavenging of crank case compression type two stroke cycle diesel engines, and the influences of the engine rpm's, delivery ratios, fuel injection quantities, crank case compression ratios and guide angles of scavenging ports upon the scavenging performance were examined. Furthermore these engines were converted to the type with a scavenging pump and they were compared with the former type engine. And thus the scavenging characteristics of the crank case compression type engines were made distinct.抄録全体を表示PDF形式でダウンロード (1108K) -
松岡 信, 清水 久二1962 年 28 巻 195 号 p. 1577-1589
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, the authors are going to clarify the dynamic performance of the engine indicator by developing the techniques of the Guillemin's Transient Responce Method. The indicators authorized by the new calibration are MPRE-MV type, developed by recently(1)∼(5) by one of the authors, S.Matsuoka. Expecting to get more accurate and precise frequency responce performance characteristic of indicator than the Guillemin's one, the authors succeeded it by introducing new ideas about the end correction factor, input correction factor and about the experimental techniques into the Guillemin's. Also the authors deviced to introduce a mechanical shock method to examine the calculation of T.R. method by shock tube. This calculation are also compared by the approximated method of the second order system. As a conclution the authors clearly recognized that there exists a lower resonance frequency in this type indicator and it badly affects to the linear band range of dynamic performance of the indicator. The authors pointed out that the resonance was due to the lateral natural frequency of strain tube. From these conclusions, the authors introduced an excellently high performance indicator, using semi conductor gauge and the very shortend strain tube.抄録全体を表示PDF形式でダウンロード (1952K) -
瀬尾 正雄, 加藤 寛1962 年 28 巻 195 号 p. 1590-1597
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーSometimes there occurs serious pitting on the cylinder liner of diesel engine. The experiments of corrosion protection, using flexible type zinc anode, performed for the main engine of a certain tugboat which has been troubled with corrosion these few years, are presented in this paper. The results of experiments are pretty good and the pitting was prevented. In this case, anticorrosion current was performed 60∼80 mA per each cylinder. The anode can be installed so easily, because it can be replaced from an inlet opening of cooling water that the cost is minimized.抄録全体を表示PDF形式でダウンロード (1217K) -
寺野 寿郎, 黒須 顕二, 村山 雄二郎, 奥村 幸輝1962 年 28 巻 195 号 p. 1597-1606
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーThe hydraulic instability is one of the impermissible evil in the operation of BWR. And there has been no effective way preventing from it, because its mechanism is not clarified yet. The authors made many experiments with an electrically heated natural-circulation-loop, which is equipped with an electric condenser type void-meter. As a result, they conclude that the hydraulic instability is a kind of non-linear oscillation caused by the combination of the fluid kinetics in the heating section and the non-linearity of the friction loss of the two-phase flow. They also derive analytically a block diagram of the circulation loop, in which the kinetics of each section are simulated with simple linear transfer functions except the term of friction loss. The solutions, calculated by an analog computer, coinside well with the experimental results.抄録全体を表示PDF形式でダウンロード (1031K) -
葉山 真治1962 年 28 巻 195 号 p. 1607-1614
発行日: 1962/11/25
公開日: 2008/03/28
ジャーナル フリーAn investigation is carried out on the hydrodynamic instability which has been observed in two-phase flow systems such as boiling water reactors or once-through boilers. In this paper a system having a single boiling channel is treated. The equation of oscillation for the circulation flow rate is derived from the laws of conservation of mass, energy and momentum. The damping coefficient in this equation is given as the inclination of the characteristic curve which represents the relation between pressure losses and the circulation flow rate. As the results, it is found that, when the equilibrium of the hydrodynamic system lies in the range of negative inclination of the characteristic curve, the system is unstable and the hydrodynamic oscillation is generated. In the case of forced circulation, the system is expected to be more stable than the natural circulation system, owing to the positive damping caused by the pump included in the circuit.抄録全体を表示PDF形式でダウンロード (921K)
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