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25 巻, 153 号
選択された号の論文の14件中1～14を表示しています
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飯島 康司1959 年 25 巻 153 号 p. 353-355
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (498K) -
武田 力也1959 年 25 巻 153 号 p. 356-361
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーIn the preceding paper, the author stated the characteristic of the current meter with its axis placed parallel to the flow. In this report, however, he has studied the characteristic curve of the current meter in the tilt flow and classified current meters into four categories in accordance with the aerofoil of its runner and with the error on its indicated velocity subject to the tilt flow. By combining characteristic curves of more than two out of the simplified runner, the author has succeeded in trial production of the combined aerofoil current meter, which satisfies Cosine law under the influence of the tilt flow.抄録全体を表示PDF形式でダウンロード (1011K) -
五味 丸典1959 年 25 巻 153 号 p. 362-368
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーThis report suggests a simple formula for calculating the mean outlet flow angle deviation caused by the secondary flow in turbine cascades of semi-infinite span, assuming the secondary vortices concentrated at their centroid, then deriving secondary velocities along the trailing edges and computing the actual vane circulation using Smith's equation(1). As the results, following conclusions are obtained. (1) Deviation of outlet flow angle increases much more with inlet flow angle than with outlet flow angle. (2) Deviation of outlet flow angle increases with the spacing of cascade, especially of impulse cascade of large camber angle. (3) Calculated results were compared with some experiments and fairly good coincidence was obtained except the effect of passage vortex of impulse cascade flowing towards the midspan.抄録全体を表示PDF形式でダウンロード (683K) -
神元 五郎, 松岡 祥浩, 岩田 省治, 河合 博志1959 年 25 巻 153 号 p. 369-376
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with Theoretical Basis of Cavitation Test for Hydrofoil Cascade. In order to obtain the accurate characteristics of hydrofoil cascade used for design of Kaplan Turbine, Axial Flow Pump and Shippropeller, the method of cavitation tests for hydrofoil cascade should be performed under the theoretical background. Usually the cascade tests are performed under the finite number of airfoils or hydrofoils arranged in the test section of the wind tunnel or cavitation tank. Therefore, the test results obtained by the above apparatus differ from the accurate characteristics of ideal cascade with infinite number of airfoils or hydrofoils. In this paper the theory of correction due to the number of airfoils or hydrofoils and due to the wall effects of test section is discussed by means of the conformal mapping, and the numerical examples of the above-shown theory are compared with the experimental results obtained in a cavitation tank, recently installed in the Hydraulic Laboratory of Kyoto University, Kyoto, Japan.抄録全体を表示PDF形式でダウンロード (1274K) -
神元 五郎, 安藤 尚, 赤松 映明1959 年 25 巻 153 号 p. 377-383
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーThe air tests of a model of propeller turbine were performed to reconsider the methods of designing Kaplan turbines by usual two dimensional treatments. The characteristics of it were obtained, the flow conditions before and after the running blades measured with the cylindrical pitot-tubes, and the pressure distributions on the running blades were compared with the ones of the two-dimensional cascades. The conclusions reached are as follows : (1) Owing to the curvature of the space between the guide vanes and runner, the radial distribution of circulation given by the guide vanes is not uniform at the entrance of a runner (different from the result expected from free vortex theory), and circulation is larger on the outer wall side. The designers should take into account such distributions of the circulation, which is theoretically obtained by an approximate calculation. (2) The pressure distributions on running blades resemble remarkably those of straight cascade test. This shows that data of cascades are much valuable to design, especially, to prevent cavitation.抄録全体を表示PDF形式でダウンロード (962K) -
神元 五郎, 松岡 祥浩, 白井 英雄1959 年 25 巻 153 号 p. 383-388
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with the Effect of Fluid Viscosity on the Performance and Pressure Distribution around the Vanes of the Impeller of Centrifugal Type Hydraulic Machinery. The viscosity of water was changed by adding of glycerin, and an impeller with 6 vanes, vane angle 30° and inner-outer radius ratio 0.6 was rotated in the above solution of glycerin, and then the head, water quantities and the pressure distribution around vanes were measured.抄録全体を表示PDF形式でダウンロード (834K) -
神元 五郎, 松岡 祥浩1959 年 25 巻 153 号 p. 389-396
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with the theory of Impeller of Centrifugal Type Hydraulic Machinery with Vanes of Arbitrary Shape and with the experimental results of some Impeller models. The theory of Impeller contains a method of conformal mapping, based on the mapping function, which represents conformally an impeller with logarithmic spiral vanes into a unit circle. The calculated results are compared with the experimental ones of some impellers with three types of vanes.抄録全体を表示PDF形式でダウンロード (722K) -
岩浪 繁蔵, 加藤 宏, 森 幹1959 年 25 巻 153 号 p. 397-403
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーOne of the most persistent problems in the design of hydraulic systems is sealing of the operating fluid in many types of machinery. Synthetic-rubber O-ring seals is being used successfully for the static, reciprocating and rotating pistons. In this report, the authors have experimentally investigated the oil leakage from an O-ring Packing used for the gascket packing. The results are : 1) O-ring must be radially compressed between the bottom of the seal groove and the cylinder wall or the flat plate for proper sealing action. This compressive force is proportional to the 4.5th powers of the J.I.S. hardness of O-ring materials. 2) The seals can be made perfectly leakproof for static conditions for oil pressure up to 280 kg/cm2 (limit of test pressure) 3) According to the "self-sealing principle" and the experimental results, O-ring can be used for the collar instead of the seal groove. 4) In order to withstand the high pressurers, setting of the O-ring packings are designed so that cover plate have no deflection in the working state.抄録全体を表示PDF形式でダウンロード (778K) -
岩浪 繁蔵, 近森 徳重, 猪野塚 明1959 年 25 巻 153 号 p. 404-408
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーWith regard to the oil leakage from O-ring packing used for a reciplocating rod, so far as the authors aware, it seems that there is any conclusive results neither theoretical nor experimental. In this report they present an experimental result out and the theoretical representations for the above object. As a result, the quantity of oil leakage Q from an O-ring is proportional to the square of the reciplocating velocity of the rod U, the n-th powers of the kinematic viscosity of the oil (m=1.5 experimentally), and more over it is affected by the pressure of the oil supplied, and the harder the material of the O-ring, the more it decreases.抄録全体を表示PDF形式でダウンロード (629K) -
沖 巖, 川上 幸作1959 年 25 巻 153 号 p. 409-416
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーI. We have more widely than ever studied the effects of valve-chamber size on the characteristics of flat-seated and conical-seated disc valves placed above the valve-seat in a valve chamber of vertical cylindrical type. Utilizing all the experimental results published in our reports (No. 1∼4), the characteristics of the valves concerned were illustrated by groups of curves, in which the diameter ratio of the valve and valve-chamber, that is, d/D ranges from o to 1, where D/d=∞ being for the case of free discharge into the air (Report No. 4) and D/d=1 for the case where discharge Q=0. II. We have prepared a valve box of the angle valve type with an inside diameter of 100 mm and inside height of 63 mm, provided with an exit hole of 50 mm in diameter on the side. Discharging water under a head of about two meters, we investigated the effects of diameter ratio of valve and valve-chamber on the characteristics of flat-seated and conical-seated valves.抄録全体を表示PDF形式でダウンロード (839K) -
沖 巖, 川上 幸作1959 年 25 巻 153 号 p. 416-425
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーIn the valve box of angle valve type described in the 5th Report, the diameter of the side exit hole was changed to 30.4 mm and the inside height of the valve-chamber to 45 mm. Flat-seated valves of five kinds and conical-seated valves of two kinds, which varied in diameter, were in turn combined with valve-chambers of six kinds varying in inside diameter, and each of these combinations was tested with water under a head of about two meters. Center height of the side exit-hole, radius of the corner rounding of the exit hole and inside height of the chamber were also varied. Experimental results thus obtained were compared with those from the valve-chamber of vertical cylindrical type and those in the case of free discharge of water into the air. Finally we have described the results of wider considerations on the valve characteristics and the matters to be attended in valve designing.抄録全体を表示PDF形式でダウンロード (1041K) -
新津 靖, 後藤 清市, 富岡 節1959 年 25 巻 153 号 p. 426-431
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーIn all the designs of air transport ducts, it is necessary to know the divided-flow characteristics when particles are flowed by air streams from a main duct to branch ducts. Then, in this report, we flowed particles through the rectangular air duct installed horizontally and studied the divided-flow characteristics between particles and air. As a result, the following conclusions have been reached : i) When particles are to be conveyed from a horizontal main duct to branch ducts, we can hardly attain our object of the divided-flow by air regulation alone, unless we install a damper at the take-offs of a duct. ii) If we install a damper at the take-offs of a duct and use together with the control of the air flow rate, we can regulate comprehensively the flow rate of particles. iii) We got a damper angle offering maximum divided-flow rate of particles for a given air flow, and showed experimental formulae concerning the damper angle and the divided-flow rate of particles.抄録全体を表示PDF形式でダウンロード (659K) -
富田 幸雄1959 年 25 巻 153 号 p. 432-438
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーWhen the high speed aerodynamic characteristics of the airfoils by the experimental method of the shallow water flow with free surface were investigated, the author showed that the four dimensionless numbers must be equal for the flows around two airfoils in order that the water depths around two geometrically similar airfoils become similar to each other. However, as this four dimensionless numbers are difficult to be equal for the two systems at the same time, the quantitative experimental results necessitate a certain defined magnitude of airfoil and water depth. On the other hand, experimental results of the defined magnitude of airfoil by the water flow of defined depth with free surface are different from the wind tunnel experimental results of the airfoil, because both Reynolds numbers differ from each other considerably. Therefore, comparing with both experimental results, the experimental formula of correction was found. Moreover, the photographs of flow pattern around the airfoils were taken, thus making the manner of flow clear to a certain extent.抄録全体を表示PDF形式でダウンロード (974K) -
富田 幸雄1959 年 25 巻 153 号 p. 439-443
発行日: 1959/05/25
公開日: 2008/03/28
ジャーナル フリーAt low velocities the flow of wood pulp slurries is similar to the flow of Bingham fluid, and the thin water film exists between the wall and the main body of the pulp during pulp flow at most velocities excepting low velocities. The author shows that the coefficient of pipe friction loss f is a function of the single dimensionless number Re*= {8ρpua2α}/τy through all velocities (ρp=density, ua=average velocity, τy=yield stress, a=re1ative plug radius). Moreover, the singularity on pressure drop of the flow of sulphite pulp (the pressure drop shows a slight decrease with an increasing velocity and at higher velocities the pressure drop again increases with an increasing velocity) is explained qualitatively.抄録全体を表示PDF形式でダウンロード (682K)
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