K. Kaneko

Saga University, Сага Япония, Saga, Japan

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Publications (70)28.14 Total impact

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    ABSTRACT: Thin circular-arc blade is often used as a guide vane, a deflecting vane, or a rotating blade of low pressure axial-flow turbomachine because of its easy manufacture. Ordinary design of the blade elements of these machines is done by use of the carpet diagrams for a cascade of circular-arc blades. However, the application of the carpet diagrams is limited to relatively low cambered blade operating under optimum inlet flow conditions. In order to extend the applicable range, additional design data is necessary. Computational fluid dynamics (CFD) is a promising method to get these data. In this paper, two-dimensonal cascade performances of circular-arc blade are widely analyzed with CFD. The results have been compared with the results of experiment and potential theory, and useful information has been obtained. Turning angle and total pressure loss coefficients are satisfactorily predicted for lowly cambered blade. For high camber angle of , the CFD results agree with experiment for the angle of attack less than that for shockless inlet condition.
    International Journal of Fluid Machinery and Systems. 01/2011; 4(4).
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    ABSTRACT: Experimental and numerical investigations were conducted for the internal flow of the stator of the diagonal flow fan. Corner separation near the hub surface and the suction surface of the stator blade are focused on. At low flow rate of 80% of the design flow rate, the corner separation between the suction surface and the hub surface can be found in both experimental and numerical results. Separation vortices are found in the computed oil flow on both suction and hub surfaces at 80% of the design flow rate in the three-dimensional numerical simulation.
    06/2010;
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    ABSTRACT: In order to clarify the effect of tip clearance (TC) size on fan performance and the flow field at rotor outlet in a small semi-open axial fan, the experimental investigation was carried out. The tip diameter of test fan rotor was 180mm and test TC sizes were 1mm (TC=1mm) and 4mm (TC=4mm). Fan characteristics tests were carried out for two cases of TC size and three-dimensional velocity fields at rotor outlet were measured using a single slant hot-wire probe at four flow-rate conditions. As a result, it was found that the pressure — flow-rate characteristics curves for two cases showed almost the same tendency. However, the ensemble averaged velocity profiles along radial measurement stations of TC=4mm largely changed compared with that of TC=1mm in cases of small flow-rate condition. From the phase-locked averaging results, it was also found that the vortex existed in the rotor outlet flow field of high flow-rate condition for each TC case. Compared with the vortices for TC=1mm and TC=4mm, the vortex for TC=4mm was stronger than that for TC=1mm.
    Journal of Thermal Science 01/2009; 18(4):294-300. · 0.30 Impact Factor
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    ABSTRACT: Experimental investigations were conducted for the internal flow of the stator of the diagonal flow fan. Corner separation near the hub surface and the suction surface of the stator blade are focused on. At the design flow rate, the values of the axial velocity and the total pressure at stator outlet decrease near the suction surface at around the hub surface by the influence of the corner wall. At low flow rate of 80–90 % of the design flow rate, the corner separation between the suction surface and the hub surface can be found, which become widely spread at 80 % of the design flow rate.
    Journal of Thermal Science 01/2008; 17(4):356-360. · 0.30 Impact Factor
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    ABSTRACT: The objective of this paper is to present the effect of end plate on the performances of the impulse turbine for wave energy conversion by experimental investigation. The experiments have been performed by model testing under steady flow conditions in the study. And then, the performances of the impulse turbine with end plates have been compared with those of the original impulse turbine, i.e., the impulse turbine without end plate. As a result, it is found that the characteristics of the impulse turbine with end plates are superior to those of the original impulse turbine. Furthermore, the effects of end plate size and penetration on the turbine characteristics have been clarified in the study.
    Journal of Fluid Science and Technology 01/2008; 3(3):450-457.
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    ABSTRACT: A Wells turbine for wave power conversion has hysteretic characteristics in a reciprocating flow. The hysteretic loop is opposite to the well-known dynamic stall of an airfoil. In this paper, the mechanism of the hysteretic behavior was elucidated by an unsteady three-dimensional Navier–Stokes numerical simulation. It was found that the hysteretic behavior was associated with a streamwise vortical flow appearing near the blade suction surface. Also the effects of solidity and setting angle on the hysteretic characteristics of the Wells turbine have been discussed in this paper.
    International Journal of Sustainable Energy 01/2007; 26(1):51-60.
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    ABSTRACT: In order to improve the performance of the Wells turbine for wave energy conversion, the effect of end plate on the turbine characteristics has been investigated experimentally by model testing. As a result, it is found that the characteristics of the Wells turbine with end plates are superior to those of the original Wells turbine, i.e., the turbine without end plate and the characteristics are dependent on the size and position of end plate. Furthermore, by using a computational fluid dynamics (CFD), reason of the performance improvement of the turbine has been clarified and the effectiveness of the end plate has been demonstrated.
    Ocean Engineering. 01/2007;
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    ABSTRACT: 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.
    Journal of Thermal Science 01/2006; 15(1):27-30. · 0.30 Impact Factor
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    ABSTRACT: The structure and behavior of rotating stall cell were experimentally clarified in a diagonal flow fan. The specific-speed of the fan was 1140 (r/min, m3/min, m), and the total pressure-rise coefficient at design flow-rate was 0.345. The static pressure on outer casing wall and the total pressure at rotor inlet and outlet were measured using a high response pressure transducer. The measured data were processed by the use of DPLA technique, and the structure and behavior of rotating stall cell were obtained. As a result, the stall cell extent for circumferential and spanwise direction and the pressure distributions inside stall cell were clarified. The details of stall cell propagation were also shown.
    Journal of Thermal Science 01/2006; 15(2):103-108. · 0.30 Impact Factor
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    ABSTRACT: In order to improve the performance of the Wells turbine for wave energy conversion, the effect of end plates on the turbine characteristics has been investigated experimentally by model testing under steady flow conditions. The end plate attached to the tip of the original rotor blade is slightly larger than the original blade profile. The characteristics of the Wells turbine with end plates have been compared with those of the original Wells turbine, i.e., the turbine without end plate. As a result, it has been concluded that the characteristics of the Wells turbine with end plates are superior to those of the original Wells turbine and the characteristics are dependent on the size and position of end plate. Furthermore, the effect of annular plate on the turbine performance, which encircles the turbine and is attached to the tip, was investigated as an additional experiment. However, its device was not effective in improving the turbine characteristics.
    Journal of Thermal Science 01/2006; 15(4):319-323. · 0.30 Impact Factor
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    ABSTRACT: An experimental investigation was made into three-dimensional separated flow and the vortices within the flow separation in a decelerating channel flow generated by the suction from a porous side wall. The flows along the side and bottom walls were visualized by the surface tuft method. The turbulent internal flow was measured by the split-film probe to investigate the turbulent flow including the reverse flow. In the flow visualization for the strong decelerating flow (the suction flow ratio:0.8), two typical flow patterns appear alternatively. One is that the flow near the bottom wall separates more upstream than the flow near the top wall and a clockwise vortex can be seen in the separation region. Another is the reversal flow pattern with a counterclockwise vortex. By the turbulent flow measurement using the split-film probe, two peaks of turbulence level are observed for the strong decelerating flow case. These peaks can be related with two flow patterns mentioned above.
    Journal of Thermal Science 01/2005; 14(4):341-345. · 0.30 Impact Factor
  • N. Shiomi, K. Kaneko, T. Setoguchi
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    ABSTRACT: 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-Locked 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.
    Journal of Thermal Science 01/2005; 14(1):9-14. · 0.30 Impact Factor
  • Transaction of The Visualization Society of Japan. 01/2005; 25(7):27-32.
  • Journal of Flow Visualization and Image Processing 01/2005; 12(2):111-123.
  • Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme - J OFFSHORE MECH ARCTIC ENG. 01/2004; 126(2).
  • Proceedings of the Institution of Mechanical Engineers Part M Journal of Engineering for the Maritime Environment 01/2004; 218(3):167-173. · 0.44 Impact Factor
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    ABSTRACT: Monoplane and biplane Wells turbines for wave power conversion have hysteretic characteristics in a reciprocating flow. In this paper, the mechanisms of the hysteretic behaviors were elucidated based on unsteady 3 dimensional Navier–Stokes numerical simulations. For the monoplane Wells turbine, the hysteretic loop is opposite to the well known dynamic stall of an airfoil. It was found that the hysteretic behavior was associated with a streamwise vortical flow appearing near the suction surface. For the biplane Wells turbine, the hysteretic behavior was similar to that of the monoplane at lower attack angles, but the hysteretic loop similar to the dynamic stall was observed at higher attack angles, which was attributed to unsteady flow separation near the hub and the trailing edge of the suction surface of the upstream blade.
    Energy Conversion and Management. 01/2004;
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    ABSTRACT: An experimental study was carried out to develop a new type of two-way diffuser suitable for a fluid flow energy conversion system. It is known that the power available from the fluid flow is proportional to the cube of the free stream velocity of the flow. Therefore, in order to take higher power output from the fluid flow, it is very important to construct a suitable system to increase the flow velocity. For a wind turbine, it has been reported that the speed of wind passing through it is dramatically increased by the use of a diffuser with a brim around the turbine. In this study, a new type of two-way diffuser suitable for a flow periodically changing its direction, such as a tidal current, was developed, applying the system to accelerate the wind speed for the wind turbine. The effects of the brim height and the outside body shape on the diffuser performance were experimentally investigated by measurement of the pressure and the velocity distributions along the center axis of the diffuser and around the diffuser. The present study is the first one to clarify the effect of these on diffuser performance.
    Renewable Energy. 01/2004; 29(10):1757-1771.
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    ABSTRACT: In order to investigate the hysteretic flow characteristics of the biplane Wells turbine in detail, an incompressible unsteady 3-dimensional numerical simulation was carried out with LES model. For the monoplane Wells turbine, the hysteretic loop is opposite to the well-known dynamic stall of an airfoil. For the biplane Wells turbine, the hysteretic behavior was similar to the monoplane at lower attack angles. But the hysteretic loop similar to the dynamic stall was observed at higher attack angles, which was attributed to the unsteady flow separation near the hub and the trailing edge of the suction surface of the upstream blade.
    Ocean Engineering. 01/2004;
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    ABSTRACT: The Wells turbine for a wave power generator is a self-rectifying air turbine that is available for an energy conversion in an oscillating water-air column without any rectifying valve. The objective of this paper is to compare the performances of the Wells turbines in which the profile of blade are NACA0020, NACA0015, CA9 and HSIM15-262123-1576 in the small-scale model testing. The running characteristics in the steady flow, the start and running characteristics in the sinusoidal flow and the hysteretic characteristics in the sinusoidal flow were investigated for four kinds of turbine. As a conclusion, the turbine in which the profile of blade is NACA0020 has the best performances among 4 turbines for the running and starting characteristics in the small-scale model testing.
    Journal of Thermal Science 01/2003; 12(4):323-327. · 0.30 Impact Factor