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23 巻, 125 号
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森田 忠孝1957 年 23 巻 125 号 p. 1-2
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (488K) -
藤江 邦男1957 年 23 巻 125 号 p. 3-6
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーIncreased knowledge of flow conditions within centrifugal compressors may lead up to an improvement of the compressor performance.For the purpose of the design of centrifugal compressors with higher aerodynamic. efficiency and better over-all performance, the author has carried out experimental investigation of three dimensional velocity distribution within centrifugal impeller for a given set of operating conditions, Which are a tip speed 37.3 m/s, and flow rates 0.026, 0.022 and 0.013.Further, experimental velocity distributions have been compared with velocity distributions by the two dimensiona1 potential theory.The principal conclusions are as follows ; it is found that there is essentially a difference between experimental and theoritical velocity distributions in meridional plane, and the flow through passages separates into two parts, so that negative and positive pressure blade surface side.抄録全体を表示PDF形式でダウンロード (516K) -
古屋 善正, 鈴木 恵三1957 年 23 巻 125 号 p. 7-13
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーWhen flow in diverging pipe separates from the pipe walls, there occurs an increasing loss of energy and at the same time the flow begins to vibrate, being accompanied by other trouble. In this paper we describe the results of experiments on flow in a 20° conical diffuser. In the initial state of separation a reverse flow takes place near the pipe walls, the main flow going straight ahead in the form of a jet entirely uninfluenced by the diverging walls. The points of separation of the flow can be determined by the sudden increase in boundary layer thickness (displacement thickness). In this initial state of separation, the value of efficiency of pressure recovery is slightly lower than its maximum. The efficiency increases somewhat with increasing Reynolds number and with decrease in boundary layer thickness at the pipe entrance. There is considerable variation in pressure which is the order of 5-10% and the main flow swirls around within the pipe. A comparison of the separation points calculated by the theory of one of the present authors with the experimental results shows good agreement.抄録全体を表示PDF形式でダウンロード (1206K) -
藤本 武助, 窪田 滋夫1957 年 23 巻 125 号 p. 14-20
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーIn order to find out the general characteristics of turbine blade row, four kinds of impulse blades were made. The profile of each blade was designed under a unified numerical formula and the camber angle of each blade is varied within a range from 90 Deg. to 130 Deg. The result obtained from the experiments of these blades enabled us to understand the general characteristics of impulse turbine blade, that is, the effect of the deflection angle to the characteristics of the turbine blade row, etc..抄録全体を表示PDF形式でダウンロード (750K) -
河崎 俊夫1957 年 23 巻 125 号 p. 20-25
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーIt is proposed that the mean total head loss, as a measure of loss in cascade tests, should be based on the mean total head far downstream, where mixing of wake with surrounding flow is completed. The exact formula of computing the mean total head loss from the data of total head traverse of a wake is derived allowing the effects of compressibility, together with the approximate one which eliminates labor of computations to the minimum. The mean total head loss computed by the present formula gives a constant value irrespective of the distance of the plane of traverse from the trailing edge of a blade as shown in Fig.6. It is also confirmed that the relation between the momentum loss and the loss in the axial component of force acting on a blade is same in compressible flow as in incompressible flow.抄録全体を表示PDF形式でダウンロード (712K) -
下山 美徳, 伊藤 忠哉1957 年 23 巻 125 号 p. 25-31
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーThe phenomena of surging of a blower is the self-excited vibration of air colum in the pipeline. To obtain a fundamental understanding of the vibrating air column, free vibrations are studied experimentally. The influence of the valve, the opening, and the blower are also tested. The results : 1. The values of natural frequencies calculated on the basis of the acoustic theory hold sufficient accuracy even for a pipe-line of large scale. 2. When the amplitude of pressure variation is small (about 150 mm Aq.), a valve inserted into the pipe has little effect on natural frequency even if the opening ratio is about 0.1. 3. When either the valve or the blower is in the pipe-line, the damping ratio of vibration of air column increases with the amplitude. 4. The damping effect of an opening on any mode of vibration of air column is the greatest, when its position coincides with a node of the mode.抄録全体を表示PDF形式でダウンロード (1077K) -
下山 美徳, 伊藤 忠哉1957 年 23 巻 125 号 p. 32-37
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーThis paper deals with experiments on surging phenomena. The results are summarized here. 1. The air column in the pipe-line vibrates in a certain form resembling that of free vibration. 2. The more rapid revolutions of a blower become, the more violent the surging grows, and the more important role the characterristic of a blower plays in determining the amplitude of the surging. 3. When the length and area of a cross section of the pipe-line are fixed, the surging is apt to build up according to the volume of the tank. 4. The feature of the surging is considerably influenced by the conditions under which the energy is dissipated from vibrating air column.抄録全体を表示PDF形式でダウンロード (925K) -
下山 美徳, 伊藤 忠哉1957 年 23 巻 125 号 p. 38-44
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーThe position of a blower connected to a pipe-line has a strong effect on surging. In this paper, the authors have investigated such effects experimentally with many types of pipe-lines. The results are as follows : 1. The amplitude of velocity variation at the position of the blower is an important factor in determining the state of the surging. 2. When a blower is placed at a position coinciding with the loop of a mode of free vibration of air column in the pipe-line, the surging of that mode is the most violent. 3. By p1acing a blower at a node, the surging can be lessened or checked entirely. 4. The position of the blower has almost no effect on the frequency of surging.抄録全体を表示PDF形式でダウンロード (942K) -
下山 美徳, 山田 豊1957 年 23 巻 125 号 p. 44-49
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーThe resistance of water as it flows through co-axial cylinders and through a labyrinth formed by cutting several grooves on the surface of the inner cylinders was studied experimentally. The following results were obtained : 1) In the co-axial cylinders with very small clearance, the resistance coefficients λ can be indicated only as functions of Reynolds Number Re. That is to say, the value of λ is 48/Re which coincides with the theoretical value for laminar flow, and that for turbulent flow is 0.26 Re-0.24, where Re=vms/ν, vm is the mean velocity, and s is the clearance. 2) In a geometrically similar labyrinth packing, it is confirmed by experiments that the resistance coefficients depend only on Reynolds Number. 3) The value of λ increases with increase of clearance for both laminar and turbulent flow within the range of these experiments. 4). The va1ue of λ is independent of the groove depth for laminar flow, but for turbulent flow it becomes max. when the groove depth is about one-fourth its breadth.抄録全体を表示PDF形式でダウンロード (844K) -
村上 光清1957 年 23 巻 125 号 p. 49-53
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーA strong periodical vibration will be observed, when the tangential component of velocity of the Water flowing through the draft tube of a water turbine increases to a certain limit. It was ascertained by experiment that the frequencies and amplitudes of vibration changed under various condititions. The results may be summarized as follows : (1) The water tank, which is placed just below the discharge end of the draft tube, and the tube itself vibrate with the same frequencies but with a phase difference of π.(2) The frequencies decrease when the length of the tube is increased.(3) The frequencies depend chiefly on the dimension of the discharge end of the tube and decrease when the dimension is increased.(4) If the vertical tube is bent having a small curvature, at about the middle of the pipe, the frequencies of the vibration depend on the vertical part of the pipe.(5) A solid core placed concentrically inside the draft tube will prevent the vibration, if the diameter of the core is larger than the diameter of the vortex core of the water.抄録全体を表示PDF形式でダウンロード (915K) -
井伊谷 鋼一, 木村 典夫1957 年 23 巻 125 号 p. 54-58
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーWe have experimented on collection efficiencies of special types of cyclones with various kinds of powder. The following conclusions are obtained, which are useful for the design of a cyclone. 1. The series connection of more than three identical cyclones is not effective. 2. The collection efficiency, calculated from measured specific surface areas of feed, collected and exhausted powders, is approximately equal to the efficiency measured by weights of the powders. 3. An inclined cyclone is not generally inferior to the normal vertical one, until its axis becomes horizontal, but the dust chamber must be designed carefully. 4. Blow down types of cyclones improve the efficiency, and the secondary extracted gas volume is recommended to be about 10∼15%. On the other hand the efficiency of blow up type is lower and becomes near zero %, when the blow up volume is increased. 5. The optimum gas inlet velocity of a cyclone depends upon the dispersion property of the powder. The size of the dust port does not affect the performances of the cyclone. Usually powder particles are not crushed in the cyclone.抄録全体を表示PDF形式でダウンロード (768K) -
鳥飼 欣一, 江頭 忠彦1957 年 23 巻 125 号 p. 59-62
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーAccording to our last report, we were able to calculate the theoretical efficiency for jet apparatus without friction between wall and fluid, and obtained a simple curve. But we did not show the friction loss. Now, we have conducted an experiment within a range of Re=104∼2×105, B (area ratio in entrance of tube) and α(=[numerical folmula])=0∼1.0. As a result we have obtained a simple empirical equation of efficiency for apparatus, whose parameters are B and α and are independent of the flow rate and Reynold's Number.抄録全体を表示PDF形式でダウンロード (609K) -
菅原 菅雄, 吉川 進三, 新居 健司1957 年 23 巻 125 号 p. 63-68
発行日: 1957/01/25
公開日: 2008/03/28
ジャーナル フリーThis research is a part of the investigation on the pneumatic spreader stoker, which conveys the slacks with air (or steam) through the conveying pipe to the nozzle, and spreads them on a fire grate. In this paper, we theoretically analised the accelerating state in a horizontal pipe and the flying distance on a fire grate of a particle, on the following assumptions. 1. The frictional force acting on a particle in a horizontal pipe, increases exponentially with time. 2. The jet stream does not diffuse, and the width of jet stream remains constant. as nozzleexit. 3. A particle is horizontally injected at nozzle-exit. Next, we studied them experimentally for several kinds of particles, and compared the theoretical results with experimental ones.抄録全体を表示PDF形式でダウンロード (1390K)
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