Search Results 1-20 of 69

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  • Blade passage modeling strategy for hydraulic turbine

    Gong Ruzhi , Trivedi Chirag , Dahlhaug Ole G. , Nielsen Torbjøn K.

    … The geometrical modelling approaches include combinations of turbine components such as, spiral casing, distributor, runner and draft tube. …

    International Journal of Fluid Machinery and Systems 10(4), 345-354, 2017

    J-STAGE 

  • Transition of the Flow around the Rotating Disk with a Radial Gap in a Cylindrical Casing with Increasing of the Reynolds Number

    WATANABE Takashi , FUJISAWA Shohei

    … The flow around a rotating disk in a cylindrical casing is investigated by the numerical method. … The radius of the disk is shorter than the inner radius of the casing, as well as the thickness of the disk is smaller than the axial length of the casing. … When there is an axial gap, the flow has been regarded as the cross flow model, and the spiral rolls and spots appear in the Bödewadt layer on the stationary end wall of the casing. …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78(786), 244-253, 2012

    J-STAGE 

  • J051024 Asymmetric Flow Behavior Due to Tip Leakage Vortex Breakdown at Near-Stall in an Axial Compressor Rotor  [in Japanese]

    KIKUTA Hiroaki , ISHITOBI Yuuki , HARA Yasunori , FURUKAWA Masato , YAMADA Kazutoyo , GUNJISHIMA Satoshi

    … The distributions of casing pressure and its fluctuation, and unsteady flow fields downstream of the rotor are analyzed. … In addition, at the downstream of the rotor, the region with high turbulence intensity is found near the casing wall. … The experimental results suggest that the spiral-type vortex breakdown should occur in the tip leakage vortex. …

    The Proceedings of Mechanical Engineering Congress, Japan 2012(0), _J051024-1-_J051024-5, 2012

    J-STAGE 

  • J011024 Mode Formation of Flow around a Rotating Disk  [in Japanese]

    WATANABE Takashi

    … The pattern changes of flows around a rotating disk in a cylindrical casing are investigated by the numerical approach. … The disk has a radius smaller than the inner radius of the casing and it also possesses a finite thickness. … In the radial gap between the disk rim and the side wall of the casing, the flows driven by the centrifugal force appear and make disturbances. … As the angular velocity increases, sickle-like vortices, bead-like vortices, spiral rolls appear. …

    The Proceedings of Mechanical Engineering Congress, Japan 2012(0), _J011024-1-_J011024-5, 2012

    J-STAGE 

  • J051054 Effects of Tip Leakage Vortex Breakdown on Unsteady Flow Fields in an Axial Flow Compressor Rotor at Near-Stall Condition  [in Japanese]

    KIKUTA Hiroaki , YAMADA Kazutoyo , Gunjishima Satoshi , OKADA Goki , HARA Yasunori , FURUKAWA Masato

    … Compared to the small tip clearance case, the pressure fluctuation on the pressure side near the leading edge of the rotor blade and the turbulence intensity near the casing wall downstream of the rotor are high in the case of large tip clearance. … Using Synchronous Field Measurement Technique (SFMT), by which the instantaneous casing wall pressure distributions are acquired, and Detached Eddy Simulation (DES), the flow mechanism of the distinctive disturbances has been investigated in the present study. …

    The Proceedings of Mechanical Engineering Congress, Japan 2011(0), _J051054-1-_J051054-5, 2011

    J-STAGE 

  • 1802 Transition process of the flow around the rotating disk in cylindrical casing  [in Japanese]

    FUJISAWA Shohei , WATANABE Takashi

    … The flow around a rotating disk in a cylindrical casing is investigated by the numerical and experimental methods. … The radius of the disk is shorter than the inner radius of the casing, as well as the thickness of the disk is smaller than the length of the casing. …

    The Proceedings of The Computational Mechanics Conference 2011.24(0), 534-536, 2011

    J-STAGE 

  • J0101-2-3 Visualization of Bead-like Vortex flow around a Rotating disk in a Cylindrical Casing  [in Japanese]

    WATANABE Takashi , FURUKAWA Hiroyuki

    … Flow around a rotating disk in a cylindrical casing is numerically and experimentally investigated. … While the disk is thick and the axial gap is narrow, the radial gap between the disk rim and the shroud of the casing is large. …

    The proceedings of the JSME annual meeting 2010.6(0), 13-14, 2010

    J-STAGE 

  • J0101-2-2 Experimental study of "spiral roll" around a rotation disk in a casing  [in Japanese]

    KAWAGUCHI Akihiro , FURUKAWA Hiroyuki

    … In previous studies of a flow caused by a rotating disk in a casing, the geometry of a rotating disk is not considered significantly. … Recent studies unveil that a gap of radius direction has an great influence on a flow between a casing base and rotating disks. …

    The proceedings of the JSME annual meeting 2010.6(0), 11-12, 2010

    J-STAGE 

  • A Study on Internal Flow in a New Type of Sewage Pump (2nd Report, Influence of Impeller Blade Loading and Volute Casing):(2nd Report, Influence of Impeller Blade Loading and Volute Casing)

    NISHI Yasuyuki , MATSUO Nobuaki , FUKUTOMI Junichiro

    … This sewage pump impeller has a structure in which the suction flow channel of closed type non-clog pump is wound in a helical spiral. … As a result of having examined influence of impeller blade loading and volute casing, it clearly indicated the following facts. …

    Journal of Fluid Science and Technology 4(3), 661-672, 2009

    J-STAGE 

  • PRESSURE AND VELOCITY FIELD IN SWIRLING FLOW AND BREAKUP OF BUBBLES  [in Japanese]

    Koishihara Kazuki , Jinbo Hiroki , Kyotoh Harumichi

    … Then a strong sink occurs at the exit of the casing, and a jet occurs around the exit channel, where the jet is reflected along the face of the casing by the Coanda effect. … The instability of the vortex core of swirling flow causes the spiral-type vortex breakdown. …

    日本流体力学会年会講演論文集 2009, 319, 2009

    NDL Digital Collections 

  • Effect of the radial gap on a flow around a rotating disc in a cylindrical casing and evaluating method of complex process  [in Japanese]

    SAWAMURA Yoichi , WATANABE Takashi , CHIYOMORI Yutaka

    … The purpose of this study is to evaluate numerically the influence of the radial and axial gaps around the rotating disc in a cylindrical casing. … This includes analysis of flow where the radial gap width between the disc rim and the inner wall of the casing appears or not. … The four quadrant classification is also used to detect the difference of the flow structure between the spiral flow and the turbulent flow. …

    日本流体力学会年会講演論文集 2009, 139, 2009

    NDL Digital Collections 

  • J0104-1-3 Experimental study of "spiral roll" around a rotation disk in a casing  [in Japanese]

    SUZUKI Yuya , FURUKAWA Hiroyuki

    … Recent studies unveil that a gap of radius direction has an great influence on a flow between a casing base and rotating disks. …

    The proceedings of the JSME annual meeting 2009.6(0), 91-92, 2009

    J-STAGE 

  • Dynamic Characteristics and Stability of a Centrifugal Blood Pump with Hydrodynamic Levitation under Flow Fluctuation(Fluids Engineering)  [in Japanese]

    NAKAMURA Yoichi , TSUKAMOTO Hiroshi

    … The test pump was developed for VAD using conical spiral groove bearings. … The rotational speed, flow rate, total pressure rise and displacement of rotor from casing center were measured to study stability of test pump. …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 75(749), 110-116, 2009

    J-STAGE  References (12)

  • A Study on Internal Flow in a New Type of Sewage Pump : 2nd Report, Influence of Impeller Blade Loading and Volute Casing  [in Japanese]

    NISHI Yasuyuki , MATSUO Nobuaki , FUKUTOMI Junichiro

    … This sewage pump impeller has a structure in which the suction flow channel of closed type non-clog pump is wound in a helical spiral. … As a result of having examined influene of impeller blade loading and volute casing, it clearly indicated the following facts. …

    Transactions of the Japan Society of Mechanical Engineers B 74(743), 1496-1504, 2008-07-25

    References (8) Cited by (2)

  • A Study on Internal Flow in a New Type of Sewage Pump (2nd Report, Influence of Impeller Blade Loading and Volute Casing):2nd Report, Influence of Impeller Blade Loading and Volute Casing  [in Japanese]

    NISHI Yasuyuki , MATSUO Nobuaki , FUKUTOMI Jnichiro

    … This sewage pump impeller has a structure in which the suction flow channel of closed type non-clog pump is wound in a helical spiral. … As a result of having examined influence of impeller blade loading and volute casing, it clearly indicated the following facts. …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 74(743), 1496-1504, 2008

    J-STAGE 

  • 1725 Flow Visualization in Regenerative Pump by PIV  [in Japanese]

    ISAKA Masanori , KUBO Takashi , ITOH Takahide , SAKAI Yasuhiko , NAGATA Kouji

    … In order to clarify an internal flow of regenerative pump, velocity measurements have been conducted by PIV (Particle Image Velocimetry) for the pump with casing and impeller made of acrylic resin. … Spiral flows that come and go between the flow passage and impeller are confirmed. … It is, therefore, considered that the number of turns of spiral flow between the flow passage and the impeller increase, and so the pump head also increase when the flow rate is small. …

    The proceedings of the JSME annual meeting 2008.2(0), 89-90, 2008

    J-STAGE 

  • 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 

  • 1619 A Study on Internal Flow in a New Type of Sewage Pump  [in Japanese]

    NISHI Yasuyuki , FUKUTOMI Junichiro , MATSUO Nobuaki , FUJIWARA Ryota , SHIGEMITSU Toru

    … This sewage pump impeller has a structure in which the suction flow channel of closed type non-clog pump is wound in a helical spiral. … As a result of having examined influence of impeller blade loading and volute casing, it clearly indicated the following facts. …

    The proceedings of the JSME annual meeting 2007.2(0), 249-250, 2007

    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 

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