巻号一覧
前身誌
22 巻, 117 号
選択された号の論文の13件中1～13を表示しています
- |<
- <
- 1
- >
- >|
-
長岡 順吉1956 年 22 巻 117 号 p. 299-300
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (451K) -
植松 時雄, 八田 圭爾, 小川 徹1956 年 22 巻 117 号 p. 301-306
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーIt is difficult to solve the differential equation determining the velocity distribution in a pipe of uniform cross-section, which has complicated boundaries. One of the methods of solution in such cases is to use the variational principle. When the quantity of flow is given, the functional which gives an approximate value of the pressure gradient along the axis greater than the true value is already known. The authors have got the functional which gives an approximate value smaller than the true value. Using these two values, it is .possib1e to determine the region in which the true value exists. As examples, the pipe of rectangular cross-section and the pipes of circular cross-section with one or two inside cores of circular cross-section are treated.抄録全体を表示PDF形式でダウンロード (702K) -
神元 五郎1956 年 22 巻 117 号 p. 306-311
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with the theoretical calculation of the wind tunnel interference in the cascade test on the assumption of two-dimensional potential flow and then with the influence of the wall boundary layer upon the tuning angle of flow in the cascade. Part I contains the theory of the wind tunnel wall interference upon the turning angle, and Part II the method of calculating the wall boundary layer effects upon the turning angle.抄録全体を表示PDF形式でダウンロード (717K) -
神元 五郎1956 年 22 巻 117 号 p. 312-317
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with the theoretical calculation of the wind tunnel interference in the cascade test on the assumption of two-dimensional potential flow. Using the theory of the wind tunnel wall interference upon the turning angle, as mentioned in the other paper, we can calculate the induced velocities and velocity gradients on each airfoil in the cascade by the tunnel walls. Hence we can introduce the induced ones into the theory of cascade composed of airfoils with arbitrary shape and obtain the theory of the wind tunnel interference with the airfoil characteristics in the cascade test. A numerical example is shown in the case of cascade composed of N. A. C. A. 6409.抄録全体を表示PDF形式でダウンロード (793K) -
神元 五郎, 安藤 尚1956 年 22 巻 117 号 p. 317-323
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーIn the water turbine, the hydro-dynamic force produces the moment around the supporting shaft of the guide vanes. If this moment is produced so as to close the guide vanes, the water turbine can be protected from the accident in an emergency of the controlling apparatus for the water turbine. From this point of view, the investigation on the self-closing of the guide vane was performed. This paper contains certain experimental results of a model of circular wing lattice with the spiral casing and the two methods of calculating the moment around the supporting shaft of the vanes, i. e. one method is that based on the theory of circular wing lattice developed by the present author and the other that developed from the thin airfoil theory of Munk. Numerical examples coincide considerably well with experimental results.抄録全体を表示PDF形式でダウンロード (743K) -
神元 五郎, 堀江 修三, 羽田 幹夫1956 年 22 巻 117 号 p. 324-330
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーThe cavitation tank test of the airfoil or hydrofoil is generally performed by means of the balance test, in spite of that the cavitation phenomena depend mainly upon the vapour pressure of the fluid. This paper deals with the cavitation test results of the airfoils NACA 4312, 4512, 6512 and 23012 by means of the pressure distribution measurement along their surfaces.抄録全体を表示PDF形式でダウンロード (847K) -
神元 五郎, 萩野 周雄, 江崎 融利亜1956 年 22 巻 117 号 p. 331-337
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーThe author performed the cavitation tests of the airfoils by means of the measurement of the pressure distribution, as published in the another report. In order to show whether or not the measured pressure at the surface exposed to the cavitation would be correct, the another minute method of measuring the cavitation characteristics should be performed. For this purpose the experimental method of measuring the wall pressure distribution was adopted. The test results of NACA 6512 shows that the above obtained results are quite satisfactory. More-over this paper contains that the approximate theory of the upper and lower walls interference being developed, the calculated results coincide well with the test results at the two cavitation tanks with the channel of different size.抄録全体を表示PDF形式でダウンロード (1109K) -
河崎 俊夫1956 年 22 巻 117 号 p. 337-343
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーAn approximate theory of cascades of airfoils is given in the present paper based on the following principles : firstly, induced potential by an airfoil composing the cascade is represented by the expansion of the complex potential near the point of infinity and the field of complex potential at the position of an airfoil is calculated by summation of induced potentials of all the other airfoils ; secondly, the boundary condition is satisfied by using the theory of airfoil in non-uniform flow. Amount of numerical calculations of the present method is relatively little and the method is especially suitable to see the effect of cascade conditions on airfoil characteristics. This method, however, loses accuracy for small values of pitch. The results of numerical calculations on the flat plate cascade and the NACA 6409 section show fairly good agreement with the exact ones over a range where pitch is larger than 1.2 or 1.4 times of the chord.抄録全体を表示PDF形式でダウンロード (704K) -
富田 幸雄1956 年 22 巻 117 号 p. 343-348
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーAlthough the perfect analogy between hydraulic jumps in liquids and shock waves in gases does not exist, both of analyses and experiments reveal that the approximate analogy between hydraulic jumps in liquids and shock waves in gases with specific heat ratio γ=1.4 exists over a range of free-stream Mach number from 2 to 6 roughly. Furthermore, the hydraulic Jumps in liquids are roughly analysed. Lastly, the method to vary the ratio of the specific heat of gas by changing form of water tank section is generally formulated.抄録全体を表示PDF形式でダウンロード (971K) -
村川 勝弥1956 年 22 巻 117 号 p. 349-353
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーIn the theoretical analysis of heat transfer of the entry length in pipes with annular space, the velocity distribution, the pressure drop, and the length of the entry length are necessary farctors, and therefore, under the conditions of wall surface of the inner and outer pipes, the inlet and the exit using hydrodynamics, Bessel functions and the finite Hankel transform, the velocity distribution, the pressure drop and the 1ength of the entry length were found theoretically, and examples of numerical calculations are also shown.抄録全体を表示PDF形式でダウンロード (603K) -
新津 靖, 倉橋 明次1956 年 22 巻 117 号 p. 353-359
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーRarely have we the electrical analysis of the network-flows which contains the confluent or separate flow characteristics of the pipe fitting part, so presenting the coefficients of the confluent or separate flow in the form a+b(sm)2, where s, m show the flow and area ratio of main pipe to branch pipe and a, b are constants respectively, we lead the electrical network circuit which approximately equals to the real pipe system. For example, by using the tungsten tube, we obtained successful results in the separate flow pipe system in general.抄録全体を表示PDF形式でダウンロード (822K) -
草間 秀俊, 辻 茂, 押田 良輝1956 年 22 巻 117 号 p. 360-364
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーIn the practice of the blower, the prevention of surging phenomena is one of the most important problems. Some studies have been published, but there has been none that gives the complete explanation on the cause of surging. Recording the instantaneous pressure and discharge of the fluid on the oscillograms by the strain gauge, we studied experimentally the surging condition of blowers and how the period of the surging and the amplitude of the pressure change were effected by the variation of delivery pipe length and the speed of impeller. Moreover, we analyzed theoretically the stability of the system which contained the blower and its pipe line, and obtained the equation of stability conditions. Then we verified experimentally its appropriateness.抄録全体を表示PDF形式でダウンロード (1179K) -
有江 幹男1956 年 22 巻 117 号 p. 365-367
発行日: 1956/05/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (425K)
- |<
- <
- 1
- >
- >|