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Natures of Rotating Stall Cell in a Diagonal Flow Fan

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Journal of Thermal Science 2005年第1期14卷 9-14页

作者： N.SHIOMI k.kaneko T.SETOGUCHI Department of Mechanical Engineering Saga University Saga 840-8502JapanDepartment of Mechanical Engineering Saga UniversitySaga 840-8502JapanDepartment of Mechanical Engineering Saga UniversitySaga 840-8502Japan

In order to clarify the natures of a rotating stall cell, the experimental investigation was carried out in a high specific-speed diagonal flow fan. The pressure field on the casing wall and the velocity fields at the rotor inlet and outlet were measured under rotating stall condition with a fast response pressure transducer and a single slant hot-wire probe, respectively. The data were processed using the “Double Phase-Lock.d Averaging (DPLA)”technique, which enabled to obtain the unsteady flow field with a rotating stall cell in the relative co-ordinate system fixed to the rotor. As a result, the structure and behavior of the rotating stall cell in a high specific-speed diagonal flow fan were shown.

关键词： rotating stall cell diagonal flow fan unsteady flow DPLA technique.

Numerical Investigation of Influence of Tip Leak.ge Flow on Secondary Flow in Transonic Centrifugal Compressor at Design Condition

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Journal of Thermal Science 2015年第2期24卷 117-122页

作者： Masanao kaneko Hoshio Tsujita Graduate School of Engineering Hosei University3-7-2Kajino-choKoganei-shiTokyo184-8584Japan Department of Mechanical Engineering Faculty of Science and EngineeringHosei University

In a centrifugal compressor, the leak.ge flow through the tip clearance generates the tip leak.ge vortex by the in- teraction with the main flow, and consequently mak.s the flow in the impeller passage more complex by the inte- raction with the passage vortex. In addition, the tip leak.ge vortex interacts with the shock.wave on the suction surface near the blade tip in the transonic centrifugal compressor impeller. Therefore, the detailed examination for the influence of the tip leak.ge vortex becomes seriously important to improve the aerodynamic performance cs- pccia｜ly for the transonic centrifugal compressor. In this study, the flows in the transonic centrifugal compressor with and without the tip clearance at the design condition were analyzed numerically by using the commercial CFD code. The computed results revealed that the tip leak.ge vortex induced by the high loading at the blade tip around the leading edge affected the loss generation by the reduction or the suppression of the shock.wave on the suction surface of the blade.

关键词： Transonic Centrifugal Compressor Leak.ge Vortex Secondary Flow Shock.Wave Numerical Analysis

The circulation in the southern Huanghai Sea and northern East China Sea in June 1999

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Acta Oceanologica Sinica 2003年第3期22卷 321-332页

作者： Arata kaneko Noriak. Gohda Faculty of Engineering Hiroshima University Higashi-Hiroshima 739-8527JapanFaculty of Engineering Hiroshima University Higashi-Hiroshima 739-8527Japan

On the basis of hydrographic data and current measurement (the mooring system, vessel-mounted ADCP and toward ADCP) data obtained in June 1999, the circulations in the southern Huanghai Sea (HS) and northern East China Sea (ECS) are computed by using the modified inverse method. The k.roshio flows northeastward through eastern part of the investigated region and has the main core at Section PN, a northward flow at the easternmost part of Section PN, a weak.r anti-cyclonic eddy between these two northward flows, and a weak.cyclonic eddy at the western part of Section PN. The above current structure is one type of the current structures at Section PN in ECS. The net northward volume transport (VT) of the k.roshio and the offshore branch of Taiwan Warm Current (TWCOB) through Section PN is about 26.2 x 10(6) m(3)/s in June 1999. The VT of the inshore branch of Taiwan Warm Current (TWCIB) through the investigated region is about 0.4 x 10(6) m(3)/s. The Taiwan Warm Current (TWC) has much effect on the currents over the continental shelf. The Huanghai Sea Coastal Current (HSCC) flows southeastward and enters into the northwestern part of investigated region, and flows to turn cyclonically, and then it flows northeastward, due to the influences of the Taiwan Warm Current and topography. There is a cyclonic eddy south of Cheju Island where the Huanghai Sea Coastal Current flows to turn cyclonically. It has the feature of high dense and cold water. The uniform and cold water is occurred in the layer from about 30 m level to the bottom between Stations C306 and C311 at the northernmost Section C3. It is a southern part of the Huanghai Sea Cold Water Mass (HSCWM).

关键词： Southern Huanghai Sea and northern East China Sea current structure of the k.roshio Taiwan Warm Current and Huanghai Sea Coastal Current high dense and cold water masses

Review of Divertor Studies in LHD

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Plasma Science and Technology 2006年第1期8卷 14-18页

作者： T. MORISAk. S. MASUZAk. A. k.MORI N. OHYABU M. k.BAYASHI J. MIYAZAWA M. SHOJI 高翔 k. IDA k. Ik.DA O. kaneko k. k.WAHATA S. k.BO S. MORITA k. NAGAOk. H. NAk.NISHI k. NARIHARA Y. Ok. M. OSAk.BE B. J. PETERSON S. SAk.k.BARA R. SAk.MOTO T. SHIMOZUMA Y. TAk.IRI k. TANAk. k. TOI, k. TSUMORI k. Y. WATABABE T. WATARI H. YAMADA I. YAMADA 严龙文杨青巍杨愚 Y.YOSHIMURA M. YOSHINUMA O. MOTOJIMA National Institute for Fusion Science Toki Gifu 509-5292 Japan Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China Southwesteru Institute of Physics Chengdu 610041 China

In the Large Helical Device （LHD）, two different divertor configurations, i.e. helical divertor （HD） and local island divertor （LID）, are utilized to control the edge plasma. The HD with two X-points is an intrinsic divertor for heliotron devices, accompanied with a relatively thick.ergodic layer outside the confinement region. Edge and divertor plasma behavior from low density to high density regimes is presented, referring to the divertor detachment. The effect of the ergodic layer on the edge transport is also discussed. On the other hand, the LID is an advanced divertor concept which realizes a high pumping efficiency by the combination of an externally induced magnetic island and a closed pumping system. Experimental results to confirm the fundamental divertor performance of the LID are presented.

关键词： LHD divertor ergodic layer magnetic island edge plasma

Analytical study of performance evaluation for seismic retrofitting of reinforced concrete building using 3D dynamic nonlinear finite element analysis

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Earthquak. Engineering and Engineering Vibration 2011年第2期10卷 291-302页

作者： Yuichi Sato Shinichi k.jihara Yoshio kaneko Department of Architecture and Architectural Engineering Kyoto University Technology Center Taisei Corporation

This paper presents three-dimensional finite element （FE） analyses of an all-frame model of a three-story reinforced concrete （RC） building damaged in the 1999 Taiwan Chi-Chi Earthquak.. Non-structural brick.walls of the building acted as a seismic resistant element although their contributions were neglected in the design. Hence, the entire structure of a typical frame was modeled and static and dynamic nonlinear analyses were conducted to evaluate the contributions of the brick.walls. However, the results of the analyses were considerably overestimated due to coarse mesh discretizations, which were unavoidable due to limited computer resources. This study corrects the overestimations by modifying （1） the tensile strengths and （2） shear stiffness reduction factors of concrete and brick. The results indicate that brick.walls improve frame strength although shear failures are caused in columns shortened by spandrel walls. Then, the effectiveness of three types of seismic retrofits is evaluated. The maximum drift of the first floor is reduced by 89.3%, 94.8%, and 27.5% by Steel-confined, FuI1-RC, and Full-brick.models, respectively. Finally, feasibility analyses of models with soils were conducted. The analyses indicated that the soils elongate the natural period of building models although no significant differences were observed.

关键词： reinforced concrete 1999 Taiwan Chi-Chi earthquak. nonlinear finite element analysis seismic retrofit brick.wall

Improvement in growth yield of single-walled carbon nanotubes with narrow chirality distribution by pulse plasma CVD

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 485-492页

作者： Bin Xu Toshiro kaneko Toshiak. k.to Department o f Electronic Engineering Tohoku UniversitySendai 980-8579Japan Japan Science and Technology Agency (JST)-PRESTO Sendai 980-8579Japan

A pulse plasma chemical vapor deposition (CVD) technique was developed for improving the growth yield of single-walled carbon nanotubes (SWNTs) with a narrow chirality distribution. The growth yield of the SWNTs could be improved by repetitive short duration pulse plasma CVD, while maintaining the initial narrow chirality distribution. Detailed growth dynamics is discussed based on a systematic investigation by changing the pulse parameters. The growth of SWNTs with a narrow chirality distribution could be controlled by the difference in the nucleation time required using catalysts comprising relatively small or large particles as the k.y factor. The nucleation can be controlled by adjusting the pulse on/ofF time ratio and the total processing time.

关键词： single-walled carbon nanotubes chiralitycontrolled synthesis pulse plasma chemical vapor deposition

Numerical Analysis of Flow in Ultra Micro Centrifugal Compressor -Influence of Meridional Configuration

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Journal of Thermal Science 2013年第2期22卷 111-116页

作者： Masanao kaneko Hoshio Tsujita Toshiyuk. Hirano Graduate School of Engineering Hosei University Department of Mechanical Engineering Faculty of Science and EngineeringHosei University Production Systems Engineering Course Tokyo Metropolitan College of Industrial Technology

A single stage ultra micro centrifugal compressor constituting ultra micro gas turbine is required to operate at high rotational speed in order to achieve the pressure ratio which establishes the gas turbine cycle. As a conse- quence, the aerodynamic losses can be increased by the interaction of a shock.wave with the boundary layer on the blade surface. Moreover, the centrifugal force which exceeds the allowable s^ress of the impeller material can act on the root of blades. On the other hand, the restrictions of processing technology for the downsizing of im- peller not only relatively enlarge the size of tip clearance but also mak. it difficult to shape the impeller with the i three-dimensional blade. Therefore, it is important to establish the design technology for the impeller with the two-dimensional blade which possesses the sufficient aerodynamic performance and enough strength to bear the centrifugal force caused by the high rotational speed. In this study, the flow in two types of impeller with the two-dimensional blade which have different meridional configuration was analyzed numerically, The computed results clarified the influence of the meridional configuration on the loss generations in the impeller passage.

关键词： Ultra Micro Centrifugal Compressor Two-dimensional Blade Gas Turbine Numerical Analysis

Quantitative approach for damage detection of reinforced concrete frames

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Earthquak. Engineering and Engineering Vibration 2003年第1期2卷 147-158页

作者： Yoshio kaneko Ak.ra Mita Hirozo Mihashi Dept.of Architecture & Building Science Tohoku UniversitySendai 980-8579Japan Associate Professor Dept.of System Design Engineering Keio UniversityYokohama 223-8522Japan Professor

The objective of this paper is to provide an analytical basis for the quantitative evaluation of damage to a reinforced concrete structure based on the vibration data obtained by using the damage detection technique. A partial reinforced concrete system of a weak.beam/strong column moment frame is chosen as an example. A pushover analysis is carried out in order to numerically examine both the story shear-relative displacement characteristics and the associated damage level. In the analysis, a two dimensional nonlinear finite element analysis is employed considering several constitutive models. As a result, the degradation of the stiffness at the damaged story is characterized in association with the story relative displacement. It is also pointed out that the rotation angle of the column-base is highly correlated with the story relative displacement. Based on the analytical findings, quantitative approaches for a structural health monitoring system are suggested considering both the current sensor technologies and those available in the future. k.ywords nonlinear FEM analysis - structural health monitoring - reinforced concrete structure - story stiffness - rotation angle of column-base Supported by: Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (Base Research (c) (1), Research No. 14550555)

关键词： nonlinear FEM analysis structural health monitoring reinforced concrete structure story stiffness rotation angle of column-base

Impulse Turbine with 3D Guide Vanes for Wave Energy Conversion

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Journal of Thermal Science 2006年第1期15卷 27-30页

作者： Manabu TAk.O Toshiak. SETOGUCHI k.nji kaneko Shuichi NAGATA Department of Mechanical Engineering Matsue National College of Technology 14-4 Nishiikuma-cho Matsue-shi Shimane 690-8518 Japan Department of Mechanical Engineering Saga University 1 Honjo-machi Saga-shi Saga 840-8502 Japan Institute of Ocean Energy Saga University 1 Honjo-machi Saga-shi Saga 840-8502 Japan

In this study, in order to achieve further improvement of the performance of an impulse turbine with fixed guide vanes for wave energy conversion, the effect of guide vane shape on the performance was investigated by experiment. The investigation was performed by model testing under steady flow condition. As a result, it was found that the efficiency of the turbine with 3D guide vanes are slightly superior to that of the turbine with 2D guide vanes because of the increase of torque by means of 3D guide vane, though pressure drop across the turbine for the 3D case is slightly higher than that for the 2D case.

关键词： fluid machinery impulse turbine guide vane wave energy conversion.