Kenji Kaneko

Saga University, Сага Япония, Saga Prefecture, Japan

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Publications (84)18.4 Total impact

  • Source
    Masami Suzuki · Toshiaki Setoguchi · Kenji Kaneko
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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.
    Preview · Article · Dec 2011 · International Journal of Fluid Machinery and Systems

  • No preview · Article · Sep 2011 · International Journal of Fluid Machinery and Systems
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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.
    No preview · Article · Jun 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.
    No preview · Article · Dec 2009 · Journal of Thermal Science
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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.
    No preview · Article · Dec 2008 · Journal of Thermal Science
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    ABSTRACT: The three-dimensional separations in a decelerating channel flow generated by the suction through a porous wall had been investigated experimentally. The decelerating flow in the straight channel in this experiment is equivalent to the flow in the straight-walled diffuser in terms of the pressure profiles. The contour of the turbulence level of the mainstream velocity shows two peak values which correspond to two corner separations. The value of cross-correlation function reaches negative peaks of large amplitude without any lag and the value of coherence gets peak value at around 0.5-2 Hz. The corner separations near the top wall and near the bottom wall keep coherent structure both with negative value of cross correlation function and with the dimensionless frequency of around 0.003-0.012, which is normalized by the inlet velocity and the hydraulic diameter of the channel.
    No preview · Article · Sep 2008 · Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
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    ABSTRACT: In order to improve the fan characteristics, especially efficiency and noise level of a small axial cooling fan with a large tip clearance, the internal flow measurements with tip leakage vortex were carried out at fan rotor outlet using an I-type hot-wire probe. The probe was set toward two directions, parallel and normal to the meridional plane of test fan, and the two directional velocity components were measured. From the result of fan test it was found that the test fan didn’t have the unstable characteristic with a positive gradient on its pressure — flow-rate curve. From the results of velocity measurement it was observed that the tip leakage vortex exited at maximum efficiency flow-rate and large flow-rate conditions. However, at small flow-rate conditions the tip leakage vortex was not observed and it was found that the flow field were enlarged toward radial outwards
    No preview · Article · Jun 2008 · Journal of Thermal Science
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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.
    No preview · Article · Jan 2008 · Journal of Fluid Science and Technology
  • Source
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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.
    Preview · Article · Aug 2007 · Ocean Engineering
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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.
    No preview · Article · Dec 2006 · Journal of Thermal Science
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    ABSTRACT: The Wells turbine is a self-rectifying air turbine which is expected to be widely used in wave energy devices with the oscillating water column (OWC). According to previous studies, however, the Wells turbine has inherent disadvantages in comparison with conventional turbines : lower efficiency and poorer stating characteristic. 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 invistigated experimentally by model testing using an oscillating airflow rig. And then, 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 is found 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.
    No preview · Article · Oct 2006 · Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
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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.
    No preview · Article · Jan 2006 · Journal of Thermal Science
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    ABSTRACT: The three-dimensional separation in a decelerating channel flow generated by the suction through a porous side wall had been investigated experimentally. Unsteady characteristics of two corner separations were especially focused on. The profiles of time averaged static pressure are two-dimensional in the height direction even in the case with large regions of corner separation. The contour of the turbulence level of the mainstream velocity shows two peak values which correspond to two corner separations. The value of cross-correlation gets large negative values without any lag and the value of coherence gets peak value at around 0.5–2 Hz. The corner separations near the top wall and near the bottom wall are not independent and keep coherent structure both with negative value of cross correlation function and with the frequency of around 0.5–2 Hz.
    No preview · Conference Paper · Jan 2006
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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.
    No preview · Article · Dec 2005 · Journal of Thermal Science

  • No preview · Article · Jan 2005
  • Toshiaki Setoguchi · Norimasa Shiomi · Kenji Kaneko
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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.
    No preview · Article · Aug 2004 · Renewable Energy
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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.
    No preview · Article · Jun 2004 · Energy Conversion and Management
  • Source
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    ABSTRACT: We carried out investigations for the purpose of clarifying the rotor outlet flow fields with rotating stall cell in a diagonal-flow fan. The test fan was a high–specific-speed (ns=1620) type of diagonal-flow fan that had 6 rotor blades and 11 stator blades. It has been shown that the number of the stall cell is 1, and its propagating speed is approximately 80% of its rotor speed, although little has been known about the behavior of the stall cell because a flow field with a rotating stall cell is essentially unsteady. In order to capture the behavior of the stall cell at the rotor outlet flow fields, hot-wire surveys were performed using a single-slant hotwire probe. The data obtained by these surveys were processed by means of a double phase-locked averaging technique, which enabled us to capture the flow field with the rotating stall cell in the reference coordinate system fixed to the rotor. As a result, time-dependent ensemble averages of the three-dimensional velocity components at the rotor outlet flow fields were obtained. The behavior of the stall cell was shown for each velocity component, and the flow patterns on the meridional planes were illustrated.
    Preview · Article · Sep 2003 · International Journal of Rotating Machinery
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    ABSTRACT: A rapid expansion of moist air or steam in a supersonic nozzle gives rise to non-equilibrium condensation. If the latent heat released by condensation exceeds a certain quanity, the flow becomes unstable and a periodic flow oscillation occurs. In the present study, a numerical study of moist air flows in a supersonic nozzle was carried out using a special short duration supersomic wind tunnel, called a Ludwieg tube. The effect of the initial relative humidity of the moist air on static pressure, condensate mass fraction and nucleation rate and total pressure loss has been clarified in case without non-equilibrium condensation upstream of nozzle. The results obtained clearly show that the total pressure loss due to non-equilibrium condensation in the Ludwieg tube should not be neglected even for a very low initial relative humidity and it is resulted from the periodic excursions of the condensation shock wave.
    No preview · Article · May 2003 · Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
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    ABSTRACT: When non-equilibrium condensation occurs in a supersonic flow field, the flow is affected by the latent heat released. In the present study, in order to control the transonic flow field with shock wave, a condensing flow was produced by an expansion of moist air on a circular bump model and shock waves were occurred in the supersonic parts of the fields. Furthermore, the additional passive technique of shock / boundary layer interaction using the porous wall with a cavity underneath was adopted in this flow field. The effects of these methods on the shock wave characteristics were investigated numerically and experimentally. The result obtained showed that the total pressure loss in the flow fields might be effectively reduced by the suitable combination between non-equilibrium condensation and the position of porous wall.
    No preview · Article · May 2003 · Journal of Thermal Science

Publication Stats

277 Citations
18.40 Total Impact Points

Institutions

  • 2001-2010
    • Saga University
      • Department of Mechanical Engineering
      Сага Япония, Saga Prefecture, Japan
  • 2002
    • Torishima Pump Mfg. Co., Ltd.
      Edo, Tōkyō, Japan
  • 1985
    • Kyushu University
      • Department of Mechanical Engineering
      Hukuoka, Fukuoka, Japan