Search Results 1-20 of 37

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  • PTV Measurement of the Unsteady Flow in a Circular Casing under Derotating Observation  [in Japanese]

    TAKEDA Tomoya , MURATA Shigeru , KUNISAKI Yasunori , TANAKA Yohsuke

    The Proceedings of Conference of Kansai Branch 2019.94(0), P034, 2019

    J-STAGE 

  • PIV Measurement of the Flow around a Stirring Object Revolving inside a Circular Casing  [in Japanese]

    TAKEDA Tomoya , MURATA Shigeru , KUNISAKI Yasunori , TANAKA Yohsuke

    … <p>In this paper, we measure the flow around a stirring object revolving inside a circular casing by using a derotator and the Rotational-Invariant-PTV. … We experimentally evaluate the performance of the Rotational-Invariant-PTV with a derotator in three different states of the rotational flow in a circular casing, which are rigidly rotating flow, unsteady flow and stationary flow. …

    The Proceedings of the Fluids engineering conference 2018(0), GS4-3, 2018

    J-STAGE 

  • Effect of Fluid Injection to a Leading Edge of Circular Cascade on Centrifugal Compressor Performance  [in Japanese]

    OTANI Kiyoshi

    … Especially when the injector exit is located near the casing aligned with the airfoil, the case of tip injection, the fluid injection momentum produces a large pressure rise and suppresses the rotating stall. …

    Turbomachinery 45(6), 358-364, 2017

    J-STAGE 

  • ICOPE-15-1164 Development of high-efficiency and low-cost shroudless turbine for small hydropower generation plant

    NAKAMURA Yohei , KOMATSU Hiroki , SHIRATORI Saki , SHIMA Ryosuke , SAITO Sumio , MIYAGAWA Kazuyoshi

    … Then, the loss in the casing and double circular cascade was improved using CFD. …

    The Proceedings of the International Conference on Power Engineering (ICOPE) 2015.12(0), _ICOPE-15--_ICOPE-15-, 2015

    J-STAGE 

  • Relation between Discrete Frequency Noise and Non-homogenous Circular Wake of a Propeller Fan  [in Japanese]

    Sasaki Soichi , Fukuda Masaharu , Mukai Shogo

    … In order to clarify relation between discrete frequency noise and non-homogenous circular wake of a propeller fan which is used in a rectangular casing, the characteristics of the propeller fans were analyzed by measurement of internal flow. … Then the circular wake formed in the propeller fan was broken by the velocity deformation. …

    Reports of the Faculty of Engineering, Nagasaki University 41(76), 1-6, 2011-01

    IR 

  • Vibration Characteristics of Reduction Gears with Inclined Planetary Gear and Arc Tooth Bevel Gear  [in Japanese]

    OHNISHI Hiroyuki , NAGASAKI Yoichi , FUJII Makoto

    … The results are as follows : In the vibration characteristics of this system, meshing frequency component is main, and the natural frequencies caused by the torsional vibration of gears and the vibration of casing supporting the input shaft, are appeared. …

    Transactions of the Japan Society of Mechanical Engineers C 74(740), 760-765, 2008-04-25

    References (4)

  • Control of Pump Performance with Attaching Flaps on Blade Trailing Edges

    Kanemori Yuji , Pan Ying Kang

    … The outlet blade edge section corresponds to the trailing edge of wing on the circular-cascade, which dominates the pump performance and pressure fluctuation. … Computational fluid dynamics (CFD) analysis of the entire impeller and volute casing and an experimental investigation are conducted. …

    International Journal of Fluid Machinery and Systems 1(1), 109-120, 2008

    J-STAGE 

  • Vibration Characteristics of Reduction Gears with Inclined Planetary Gear and Arc Tooth Bevel Gear  [in Japanese]

    OHNISHI Hiroyuki , NAGASAKI Yoichi , FUJII Makoto

    … The results are as follows : In the vibration characteristics of this system, meshing frequency component is main, and the natural frequencies caused by the torsional vibration of gears and the vibration of casing supporting the input shaft, are appeared. …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C 74(740), 760-765, 2008

    J-STAGE 

  • The Evaluation of Thermal Fatigue Crack Extension of Rotor Casing Material  [in Japanese]

    TERAMAE Tetsuo

    … Thermal fatigue crack extension test had been conducted on cylindrical specimens of rotor casing material. … Test results show that the crack depth extension rate was decreased for larger notch depth and the specimens with circular notch show larger crack extension than those with half elliptical notch. … For small circular notch, the elasto-plastic FEM analysis resulted better agreement with the experimental crack depth extension and Meshii's elastic method showed conservative estimation. …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 73(731), 809-813, 2007-07-25

    J-STAGE  References (5)

  • Cavitating vortex flow generated by a stationary volute casing and a rotating centrifugal impeller

    Okamura Tomoyoshi , Kubota Jun , Yoshikawa Tatsuya

    … A single volute casing is used, and the vortex flow collides with a solid wall. … The third device uses a centrifugal impeller and a circular swirling chamber to generate a cavitating vortex. …

    Proceedings of the 7th International Symposium on Cavitation Inception FEDSM2007, 1-9, 2007-02

    IR 

  • Performance of Very Low Specific Speed Centrifugal Pumps with Circular Casing

    KAGAWA Shusaku , KUROKAWA Junichi , MATSUI Jun , CHOI Young-Do

    … = 60, the pump efficiency is not yet clear, and the spiral angle of a volute casing becomes too small to manufacture. … To solve this problem, a circular casing is considered appropriate in the very low <i>n<sub>s</sub></i> … 60, when a circular casing is used. …

    Journal of Fluid Science and Technology 2(1), 130-138, 2007

    IR  J-STAGE 

  • Application of Circular Casing to the Centrifugal Pump of Low Specific Speed and the Internal Flow  [in Japanese]

    MATSUI Jun , NAGAHAMA Kenichiro , KAGAWA Shusaku , KUROKAWA Junichi , CHOI Young-Do

    … A circular casing with the very small radius shows the high head and efficiency as that of spiral casing. … CFD results on the circular casing case show that the flow from the impeller goes out through only the small area near the tongue, even at the best performance status. … These flow field is very different from that of ordinary spiral casing. …

    Turbomachinery 34(8), 463-470, 2006-08-10

    J-STAGE  References (7) Cited by (1)

  • Flow in the Low Specific Speed Centrifugal Pump with Circular Casing

    Matsui Jun , Kurokawa Junichi , Choi Young-Do , Nishino Kouichi

    … The internal flow of a centrifugal pump with semi-open impeller, whose type-number is O.244, is measured by PIV method and analyzed numerically The head and efficiency of a pump that has a circular casing with a very small radius are almost same as those of the spiral casing. … Even at the best efficiency point, the internal flow in the pump of circular casing is asymmetric. …

    Proceedings of the 23rd IAHR Symposium on Hydraulic Machinery and Systems, Yokohama, October 2006, 2006

    IR 

  • 327 Optimization of Semi-Active Type Journal Bearing in Consideration of Oil Film Rupture  [in Japanese]

    KOBA Yosuke , SUMIDA Masanori , KANEMITU Yoichi , KIJIMOTO Shinya , MATUDA Koichi

    … In this paper, we examine an effective vibration control method for rotor-bearing system in an operation condition in which an oil whip occurs by using adjustable quasi-circular bearing with changeable configuration of cross section. … This bearing can arbitrarily change the bearing clearance distribution in circumferential direction by using a piezoelectric actuator installed between bearing casing and metal. …

    The Proceedings of the Dynamics & Design Conference 2006(0), _327-1_-_327-5_, 2006

    J-STAGE 

  • 2432 Internal Flow Analysis of Low Specific Speed Centrifugal Pump with Circular Casing  [in Japanese]

    MATSUI Jun , KUROKAWA Junichi , NISHINO Kouichi , Choi Young-Do , MOURI Kouichi

    … The internal flow in the centrifugal pump with a circular casing is measured by PIV method. … The casing and impeller of semi-open type have two-dimensional shapes. … The radial velocity is remarkable only at the exhaust area of the casing. …

    The proceedings of the JSME annual meeting 2006.2(0), 183-184, 2006

    J-STAGE 

  • Performances of Very Low Specific Speed Centrifugal Pump with Circular Casing  [in Japanese]

    KAGAWA Shusaku , KUROKAWA Junichi , MATSUI Jun , CHOI Young-Do

    … However, below n_s=60 [m, m^3/min, min^<-1>], the pump efficiency is not yet clear, and the spiral angle of volute casing becomes too small to manufacture. … To solve this problem, a circular casing is considered appropriate in the very low n_s range. … The present study is aimed to reveal the relation between pump efficiency and a specific speed in the range of n_s≤60, when a circular casing is used. …

    Transactions of the Japan Society of Mechanical Engineers. Series B. 71(707), 1821-1828, 2005-07-25

    IR  References (11) Cited by (6)

  • Performances of Very Low Specific Speed Centrifugal Pump with Circular Casing  [in Japanese]

    KAGAWA Shusaku , KUROKAWA Junichi , MATSUI Jun , CHOI Young-Do

    … However, below <I>n<SUB>s</SUB></I>=60 [m, m<SUP>3</SUP>/min, min<SUP>-1</SUP>], the pump efficiency is not yet clear, and the spiral angle of volute casing becomes too small to manufacture. … To solve this problem, a circular casing is considered appropriate in the very low <I>n<SUB>s</SUB></I> …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 71(707), 1821-1828, 2005

    J-STAGE 

  • Deformation of Cased Circular Holes by Horizontal Stresses Working at Infinity and Internal Pressure  [in Japanese]

    Sakata Shoji

    … In most cases a borehole tiltmeter is fixed to the borehole casing by a clamping device. …

    Journal of the Geodetic Society of Japan 50(4), 263-280, 2004

    J-STAGE 

  • Analyses on the Performance and Interaction Between the Impeller and Casing in a Small-Size Turbo-Compressor

    KIM Youn-Jea , KIM Dong-Won

    … The effects of casing shapes on the performance and the interaction between an impeller and a casing in a small-size turbo-compressor are investigated. … Numerical analysis is conducted for the turbo-compressor with circular and single volute casings from the inlet to a discharge nozzle. …

    JSME International Journal Series B 46(3), 385-391, 2003-08-15

    J-STAGE  References (9)

  • Noise Generated by a Thin Type Centrifugal Fan without Scroll Casing : Effects of the Areal ratio, Geometory of the heat exchanger and Blade material  [in Japanese]

    Kodama Yoshio , Hayashi Hidechito , Sanagi Tsunehisa , Kinoshita Kanjirou , Aramaki Eisaburou

    … The relation between the sound pressure level of a centrifugal fan without scroll casing and the flow around the impeller was investigated in flow rate operating region with respect to the effects of three parameters : (1) the areal ratio, Ar (Ar=1.25,1.0,0.8), (2) the geometory of the heat exchanger, (3) the blade material. … The rotational speed of the fan in the apparatus with rectangular heat exchanger must be increased of about 7% than that with circular heat exchanger to obtain the regulation flow rate (Q=18m^3/min). …

    Reports of the Faculty of Engineering,Nagasaki University 29(52), 23-31, 1999-01

    IR 

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