巻号一覧
前身誌
20 巻, 89 号
選択された号の論文の10件中1～10を表示しています
- |<
- <
- 1
- >
- >|
-
宮井 善弘1954 年 20 巻 89 号 p. 1-5
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーThe particle impingement characteristics on a flat plate with angle of attack in a supersonic flow field are investigated analytically, for a case of flows in which the shock wave is not detached. In this analysis, the drag coefficient cD of a spherical particle does not coincide with Stokes' Low (i. e., cD=24/R), since the Reynolds' Number R of a particle is not small, and CD=0.4 for R=103∼104 ; so we have used the approximation of cD=24/R+0.4 for R=0∼104. All characteristics of particle impingement on a flat plate are found theoritically, and numerical calculations have also been done for water droplets of 0.1mm in diameter at free stream Mach Number M0=2.0.抄録全体を表示PDF形式でダウンロード (662K) -
三雲 英之助, 小門 純一1954 年 20 巻 89 号 p. 6-11
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーIn this 2nd report, the authors, from the results of the 1st report, have derived a calculation method to obtain the pressure drop along a straight pipe when the groups of particles of quartz as well as coal are transported in the horizontal pipe, and ascertained that the experimental results were in close accordance with the calculated methods mentioned above. At first, the calculation method and the experiments were limited in the case of straight and horizontal pipe and the air velocities at inlet and outlet of the pipe are equal. And then they derived the Gasterstadt's experimental formula theoretically using the time base instead of the distance base which was used by Gasterstadt. Next, the authors discussed the calculation methods required to convey the mass of pieces by the air current in a long pipe, taking into consideration the variation of air density, coefficient of resistance between air and pipe and pieces velocity consequently the variation of air velocities along a horizontal straight pipe and showed some calculation examples.抄録全体を表示PDF形式でダウンロード (850K) -
渡部 一郎1954 年 20 巻 89 号 p. 11-15
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーExperiments were performed using a centrifugal blower fitted with a double sided impeller of 300mm diameter having backward curved vanes to examine the effect of inlet air temperature on the performance characteristics, with particular reference to the variation of pressure ratio. The inlet air temperature was varied from minus 20°C to plus 35°C. The results were found to satisfy the relation previously found by Prof. S. Awano that γ-1 varies inversely proportional to the absolute inlet air temperature, where γdenotes the pressure ratio of the blower. Further, the experimental results were found to satisfy the dimensional relationships established by R. S. Capon and G. V. Brooke. As for axial compressors, it was found that the above-mentioned relation is also applicable from the theoretical point of view.抄録全体を表示PDF形式でダウンロード (779K) -
草間 秀俊, 南 俊悟, 辻 茂1954 年 20 巻 89 号 p. 15-19
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーIn the previous paper, one of the authors studied theoretically on the growth of the surging phenom ena in centrifugal pumps. To verify the adequacy of this theoretical results, now, they studied experimentally on surging of various pumping systems. Simultaneously they examined the effect of impeller exit angle β2 on the surging. The result is as follows : (1) The experimental results coincide with the theory. (2) The surging range of volute pump is less than that of the turbine pump. (3) The surging range reduces with the diminution of β2, but the growth of surging cannot be avoided even in the case of β2=16°. (4) Pump efficiency at normal discharge reduces with the diminution of β2, but the efficiency at small discharge does not reduce. When the running at small discharge takes place very often, the preventing method for surging by the diminution of β2 is somewhat effective.抄録全体を表示PDF形式でダウンロード (756K) -
佐藤 雄二1954 年 20 巻 89 号 p. 20-24
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーIn hitherto published works on surging phenomena or another unstable behaviours of fluid machinery system, they used to assume that the speed of revolution of the machine is constant throughout the behaviour. This assumption is removed in this study, and equations of revolving motion of rotary parts of machinery including prime mover, are taken into consideration as well as that of fluid motion in the pipe line. Outline of phenomena and criterion of stability were clarified by numerical solutions for several examples of two degrees of freedom.抄録全体を表示PDF形式でダウンロード (737K) -
植田 辰洋1954 年 20 巻 89 号 p. 25-31
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーThe Author has determined the optimum dimensions of the jet pump by systematic experiments. (a) The length from the outlet of nozzle to the inlet of diffuser throat should be less than 1.5dt (dt=diameter of diffuser throat), and the length from the outlet of nozzle to the inlet of diffuser divergent part should be 5∼6dt. (b) The conical angle at the inlet of diffuser has little effect in the range 24°∼56°. It is shown that the characteristic equation obtained in this paper closely coincides with experimental results when the optimum dimensions are taken. And study on the most important value of the jet pump "area ratio of nozzle throat and diffuser throat" is advanced, and the relations which make the efficiency maximum in its given condition are given. By these, it is shown that the efficiency of the jet pump can take a value of 37∼38% as a maximum value.抄録全体を表示PDF形式でダウンロード (879K) -
鬼頭 史城1954 年 20 巻 89 号 p. 32-35
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーAs a continuation of the previous paper of the same title, the author here takes up the case in which the length l1 of the pressure tunnel is infinitely long. Assuming that the so-callled rigid-body theory is applicable, the author shows that the solution of the problem can be reduced to a solution of differential equation of Riccati's type (at least in the practical sense). Comparison of the results of numerical calculation for the two cases, which were obtained by applying theoretical formulae of the previous paper and that of the present paper are also given.抄録全体を表示PDF形式でダウンロード (558K) -
板谷 松樹, 辻 茂1954 年 20 巻 89 号 p. 35-38
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーBy the use of oil, the present authors have determined the coefficients of discharge, C, of the piston valves with a single hole, and have obtained an experimental formula, where C is represented as a function of hole diameter, d (mm), and of opening ratio of the hole, m. The results are represented as follows : C=0.681+0.0136d+0.059m, (P2>P2c and C=0.681+0.0136d+0.059m-0.035 (P2c-P2), (P2<P2c) where P2c=1+0.35m (P1-1), and P1 and P2 are the absolute pressure at the inlet and outlet of the valve, respectively.抄録全体を表示PDF形式でダウンロード (614K) -
井伊谷 鋼一1954 年 20 巻 89 号 p. 38-44
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーI have experimented on collection efficiencies of various types of cyclones, and discussed the results basing on my theory. I generally recongnize that the experimental results coincide with my simple theory on the whole, but the details of the results have various peculiarities. The effects of opening and closing of dust port, diameter and inserted length of exit pipe, inlet velocity, cone angle, diameter and length of cylindrical part, shape of inlet part, inner wall friction, feed position of powder, regulation position of gas quantity, pressure and suction type, horizontal type, size distribution of sample powder, etc. are examined on many cyclones with different kinds of powder.抄録全体を表示PDF形式でダウンロード (1059K) -
沖 巌1954 年 20 巻 89 号 p. 44-47
発行日: 1954/01/20
公開日: 2008/03/28
ジャーナル フリーAs to the discharge coefficients for rectangular weirs with two side-contractions two formulas are compared and discussed, one being that deduced by the author (1929) and the other by Itaya and Teshima (1949). As to the suppressed weir with higher crest Ishihara and Ida (1951) have supplemented Rehback's (1913) formula of discharge coefficient. The present auther has recently deduced a formula of discharge coefficient for rectangular weirs with absolutely complete contractions. He proposes finally to establish a formula of discharge coefficient for rectangular weirs of any proportions, including all the cases from absolutely complete contraction type to one in which end-contractions are entirely suppressed.抄録全体を表示PDF形式でダウンロード (673K)
- |<
- <
- 1
- >
- >|