巻号一覧
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21 巻, 105 号
選択された号の論文の15件中1～15を表示しています
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松代 正三1955 年 21 巻 105 号 p. 319-320
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (475K) -
植松 時雄, 八田 圭爾, 中村 貞男1955 年 21 巻 105 号 p. 321-324
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThe variational method is used to calculate the pressure gradient in the region near the entrance of a circular pipe in the case of laminar flow. The functional of the velocity distribution is chosen, whose stationary value gives the pressure gradient along the axis of the pipe, and the condition that the functional takes the stationary value coincides with the equation of motion. The velocity distribution is assumed to be the form of generalized parabolic arc. The result is that the correction of Hagenbach is 2.25 (ρu^-2/2), where ρ is the density of fluid and u^- is the mean velocity in the pipe. The velocity distribution also coincides fairly well with Nikuradse's experimental result.抄録全体を表示PDF形式でダウンロード (510K) -
新津 靖, 倉橋 明次1955 年 21 巻 105 号 p. 324-329
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThe pipe line nets which have two parallel main pipes combined with many branch pipes, are widely utilized in the industrial field, and it is often required to distribute the flow uniformly through each branch pipe. In this paper, a method of flow control is investigated for this pipe line system, and we have derived a calculating formula of controled resistance value to make the flow equation satisfy in parallel or counter flow type pipe line. And we used the orifice as the controlling resistant body to be inserted in the branch pipe and observed its effect in comparison with the experiment and the theoretical calculation.抄録全体を表示PDF形式でダウンロード (728K) -
窪田 滋夫1955 年 21 巻 105 号 p. 329-335
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーA simple method for calculating the flow around the straight wing lattice with high camber as the case of turbine blade is here developed. In this method the wing lattice with no thickness, which is quite similar to the skeleton line of given blade section, is calculated at first. And using this result, pressure distribution around the given blade section is found by the principle of thin aerofoil theory. A numerical example shows good agreement with the experimental result.抄録全体を表示PDF形式でダウンロード (906K) -
窪田 滋夫1955 年 21 巻 105 号 p. 335-342
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThis original papers are consist of three short paragraphs. In the first paragraph, according to the assumption by F. Weinig, a method for calculating the pressure distribution around the leading edge of cascades is developed, and the forms of leading edge are discussed by some numerical examples. In the second, the additional losses and the deviation of outlet flow angle owing to the blade thickness at the trailing edge are researched experimentally, and in the last paragraph, an example of strict solution for β2-t/L curve in cascades (β2 : direction of outlet flow, t/L : pitchchord ratio), which is composed of some specially formed blade section, is derived theoretically.抄録全体を表示PDF形式でダウンロード (957K) -
宮津 純1955 年 21 巻 105 号 p. 342-349
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper treats the theory of a viscosity pump with spiral groove. The rotating disc is in contact with the bed plate having the groove in shape of spiral. If the groove is narrow and shallow, and the liquid is viscous, the rotor is able to give the effective driving shear to the liquid, forcing it towards the centre of rotation. Starting from viscosity law, the equation of pump characteristics have been deduced, and further developed for the grooves in shape of logarithmic spiral and spiral of Archimedes. On the basis of characteristics drawn in the analysis, the optimum ratio of the radial distances of the inlet and outlet of the groove has been determined.抄録全体を表示PDF形式でダウンロード (914K) -
草間 秀俊1955 年 21 巻 105 号 p. 350-355
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, the author studied theoretically the stability of pumps and these pipe line systems, when two pumps are connected in series and parallel. To treat theoretically these series and parallel running, the theoretical means in preveous reports were modified. The results are considerably analogous to the case of single pump running. In the parallel running, however, the system containing air tank or water tank, has many dynamical freedoms, which we cannot solve generally. For the present case we intend to make it clear experimentally in the next report.抄録全体を表示PDF形式でダウンロード (732K) -
草間 秀俊, 辻 茂, 木口 俊夫1955 年 21 巻 105 号 p. 355-358
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーTo verify the adequacy of the theoretical results described in the previous report, the authors studied experimentally on surging of pumping systems in series-and-parallel running. The results showed that the experimental results coinsided with the theory, and the following three conditions were essential to the occurence of the surging of pumping systems : (1) Rising characteristics of the relation between resultant head and discharg. (2) The existence of air tank, liquid tank or air chamber in pipe lines. (3) Valve which controls the pump discharge, is located after (downstrean) the air tank etc.抄録全体を表示PDF形式でダウンロード (584K) -
伍賀 篤1955 年 21 巻 105 号 p. 358-363
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThe design method of three dimensional flow has recently been used to multi-stage compressors. This paper establishes the theory of three dimensional-flow design and introduces what blading gains the best total efficiency. The fact that the best total efficiency is obtained by the best stage one and the least pressure losses of before and behined guide vanes, and the best blade element efficiency is obtained by a flow pattern of 50% reaction and one-half velocity coefficient, is well known. Only by the use of non-uniform pre-moving and guide vanes, all 50% reaction and mean axial velocity uniform type blading is obtained. This blading shows the best total efficiency of all.抄録全体を表示PDF形式でダウンロード (657K) -
伍賀 篤1955 年 21 巻 105 号 p. 364-367
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーWhen blade pitch-chord ratio becomes small, the fluid outlet angle of the moving and guide vanes may be constant throughout all the flow ranges. This paper calculates the off-design performance of an axial-flow blower assuming the outlet angle be constant. Result is that the stage characteristics can be easily assumed by the whirl coefficient of mean geometrical radius of design flow and that the change of blade tip turning angle is greater than the root. This shows a reason why surging is caused by the reverse flow of a blade tip radius.抄録全体を表示PDF形式でダウンロード (530K) -
原田 幸夫, 市毛 進1955 年 21 巻 105 号 p. 367-373
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThis article is a report of our experiments regarding how much the pressure loss in cyclone dust separator may be changed by different proportions of the construction. In these experiments we have obserbed the influences on pressure loss by the different proportions of the main parts in the standard type of cyclone ; i. e. by the different cross-sectional areas of inlet slot, by the different diameters of exit pipe, by the different hights of cyclone body, and by the different lengths of exit pipe. The experimental formulae has become as follows : [numerical formula] Where Δp=total pressure loss in cyclone, ui=linear speed in inlet slot, R=Reynold's number in inlet slot=[numerical formula], b×h=cross sectional area of inlet slot, D=diameter of cylindrical portion of cyclone body, d=inside diameter of exit pipe, H=effective length of cyclone body, l=length of exit pipe, r=specific weight of fluid gas, g=accelaration due to gravity.抄録全体を表示PDF形式でダウンロード (853K) -
藤井 澄二1955 年 21 巻 105 号 p. 374-377
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThe paper deals with the possibility of generating sustained water-hammer by a fluttering valve which statically increases its opening with the increase of the pressure in the up-stream and which is usually expected to make a system rather stable, contrarily to the valve in the author's previous papers which decreases its opening with the increase of pressure in the up-stream. When the frequency of pressure variation in the up-stream is slightly higher than the natural frequency of the valve, the phase of the motion of the valve treated here is almost reversed relatively to the phase of pressure variation, and the amplitude of the valve is considerably large. This means that the valve can act as a negative resistance for pressure waves having frequencies slightly higher than its natural frequency, if only the damping of the valve motion is sufficiently small.抄録全体を表示PDF形式でダウンロード (613K) -
小茂鳥 和生1955 年 21 巻 105 号 p. 377-382
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーThis paper gives the results of experimental research on leakage of air through straight through type labyrinth packing. The generall relations between leakage, number of constrictions, pitch of constrictions and pressure ratio are given in grahycal forms. These results substantially agree with the theoretical equations that have been reported, though the factor of number of constrictions is in need of correction. Moreover the carry-over factor is defined. This factor is a function of the ratio of the pitch of constrictions to clearance.抄録全体を表示PDF形式でダウンロード (848K) -
生井 武文1955 年 21 巻 105 号 p. 383-386
発行日: 1955/05/25
公開日: 2008/03/28
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笠原 英司1955 年 21 巻 105 号 p. 386-388
発行日: 1955/05/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (716K)
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