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| 1 | Flow Fields with Vortex in a Small Semi-open Axial Fan显示文摘In order to clarify the effect of tip clearance (TC) size on fan performance and the flow field at rotor outlet in asmall semi-open axial fan, the experimental investigation was carried out. The tip diameter of test fan rotor was180mm and test TC sizes were lmm (TC=1mm) and 4mm (TC=4mm). Fan characteristics tests were carried outfor two cases of TC size and three-dimensional velocity fields at rotor outlet were measured using a single slanthot-wire probe at four flow-rate conditions. As a result, it was found that the pressure - flow-rate characteristicscurves for two cases showed almost the same tendency. However, the ensemble averaged velocity profiles alongradial measurement stations of TC=4mm largely changed compared with that of TC=lmm in cases of smallflow-rate condition. From the phase-locked averaging results, it was also found that the vortex existed in the rotoroutlet flow field of high flow-rate condition for each TC case. Compared with the vortices for TC=1mm andTC=4mm, the vortex for TC=4mm was stronger than that for TC=1mm. | Norimasa. Shiomi Yoichi Kinoue Ying zi Jin Toshiaki Setoguchi Kenji Kaneko | 2009 | Journal of Thermal Science2009，18，4： | 12 |
| 2 | Effect of Rotational Speed on the Stability of Two Rotating Side-by-side Circular Cylinders at Low Reynolds Number显示文摘Flow around two rotating side-by-side circular cylinders of equal diameter D is numerically studied at the Reynolds number 40≤ Re ≤200 and various rotation rate θ_i. The incoming flow is assumed to be two-dimensional laminar flow. The governing equations are the incompressible Navier-Stokes equations and solved by the finite volume method(FVM). The ratio of the center-to-center spacing to the cylinder diameter is T/D=2. The objective of the present work is to investigate the effect of rotational speed and Reynolds number on the stability of the flow.The simulation results are compared with the experimental data and a good agreement is achieved. The stability of the flow is analyzed by using the energy gradient theory, which produces the energy gradient function K to identify the region where the flow is the most prone to be destabilized and the degree of the destabilization. Numerical results reveal that K is the most significant at the separated shear layers of the cylinder pair. With Re increases,the length of the wake is shorter and the vortex shedding generally exhibits a symmetrical distribution forθ_i<θ_(crit), It is also shown that the unsteady vortex shedding can be suppressed by rotating the cylinders in the counter-rotating mode. | DOU Huashu ZHANG Shuo YANG Hui SETOGUCHI Toshiaki KINOUE Yoichi | 2018 | Journal of Thermal Science2018，27，2： | 3 |
| 3 | Flow Fields with Tip Leakage Vortex in a Small Axial Cooling Fan显示文摘为了改进扇子特征,特别效率和噪音,与一个大尖端清理一把小轴的冷却扇子铺平,有尖端漏旋涡的内部流动大小用一根我类型热电线的探针在扇子转子插头被执行。探查被设为向二个方向,平行和正常测试扇子的南方的飞机,并且二个方向性的速度部件被测量。从扇子测试的结果,测试扇子没在它的压力上与一个积极坡度有不稳定的特征,这被发现—流动率曲线。从速度测量的结果,尖端漏旋涡在最大的效率流动率和大流动率条件退出了,这被观察。然而,以小流动率条件,尖端漏旋涡没被观察,流动地被扩大向。 | Norimasa Shiomi Ying zi Jin Kenji Kaneko Yoichi Kinoue T. Setoguchi | 2008 | Journal of Thermal Science2008，17，2： | 2 |
| 4 | Corner Separations around a NACA65 Blade in a Decelerating Flow (Experimental Investigations by Five-Hole Probe and PIV)显示文摘In order to examine the fundamental characteristics of corner separation in a decelerating cascade flow,the experimental apparatus was made and separations around a NACA65 blade in a decelerating channel flow were examined.Two-dimensional calculations show that the NACA65 cascade flow that has 45 deg.of turning,1.24 of solidity and 17 deg.of stagger angle is equivalent to the channel flow that has 14 deg.of stagger angle in terms of pitchwise blade force.Experimental investigation by five-hole probe shows that the accumulations of low energy fluid can be seen around the corner part and the overturning flow due to the secondary flow exists.And,as the periodicity of the blade wake in a pitchwise direction is comparably good,the wake of this channel flow is similar to the wake of the cascade flow for two pitch portion.PIV measurement results shows that a vortex pattern can be seen in the momentary streamline on the suction surface of the blade and in the averaged streamline on the perpendicular to both the suction surface and the endwall. | Yoichi Kinoue Ryutaro Ohhira Norimasa Shiomi Toshiaki Setoguchi | 2013 | Journal of Thermal Science2013，22，1： | 1 |
| 5 | Comparison of Performances of Turbines for Wave Energy Conversion显示文摘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. | Yoichi Kinoue Toshiaki Setoguchi Tomohiko Kuroda Kenji Kaneko Manabu Takao Ajit Thakker | 2003 | Journal of Thermal Science2003，12，4： | 0 |
| 6 | Unsteady Flow at Low Flow-rate Region in a Semi-open Propeller Fan (Velocity Fluctuation outside of Blade Tip)显示文摘In order to clarify the unsteady flow fields at low flow-rate region with positive gradient on pressure-flow-rate curve,the experimental investigation was carried out at rotor inlet and outside of rotor blade tip without casing in a semi-opened propeller fan using a hot-wire anemometer.A single I-type hot-wire probe was used,and the data obtained were processed by the use of phase-locked averaging,ensemble averaging and FFT analyzing.The flow fields at rotor inlet and outside of rotor blade tip were discussed mainly using the results from distributions of velocity fluctuations and power spectrum density.It was found from these results that there are the two types of different periodical fluctuations and both of those frequencies were not the same of rotor rotating frequency(RRF;15Hz).One was observed at relatively high flow-rate region at relatively downstream area in measurement and its frequency was approximately 7Hz(47% of RRF).The other was observed at relatively low flow-rate region at relatively upstream area in measurement and its frequency was approximately 10Hz(67% of RRF)'.As the velocity fluctuations with the flow fields are rapidly increased by the former fluctuation,it is thought that its fluctuation is the trigger of blade stall. | Norimasa SHIOMI Yoichi KINOUE Toshiaki SETOGUCHI | 2011 | Journal of Thermal Science2011，20，3： | 0 |
| 7 | Three Dimensional Separation with Spiral-Focus in a Decelerating Duct Flow (Effect of Asymmetric Inlet Boundary Layer Thickness)显示文摘An experimental apparatus was developed to study the three dimensional separated flow with spiral-foci.The internal decelerating flow was generated by the air suction from a side wall to produce the separation on an opposite-side wall.The relation between the upstream boundary layer and the generation of spiral-foci in the separation region was observed by a tuft method.As a result,it was clarified that the spiral-focus type separaton could be produced on the side wall and its behavior was closely related to the vortices supplied into the separation region from the boundary layer developing along top wall or bottom one. | Yoichi Kinoue Toshiaki Setoguchi Kenji Kaneko Mamun Mohammad Masahiro Inoue | 2003 | Journal of Thermal Science2003，12，1： | 0 |
| 8 | Experimental Investigation of Stator Flow in Diagonal Flow Fan显示文摘试验性的调查为斜流动扇子的定子的内部流动被进行。中心表面和定子片的吸表面附近的角落分离上被集中。以设计流动率,在定子插头减少的轴的速度和全部的压力的价值接近吸表面在在由角落墙的影响的中心表面附近。以设计流动率的 80 90 % 的低流动率,表面能被发现的在吸表面和中心之间的角落分离,它广泛地变得在设计流动率的 80 % 传播了。 | Jie Wang Yoichi Kinoue Norimasa Shiomi Toshiaki Setoguchi Kenji Kaneko Yingzi Jin | 2008 | Journal of Thermal Science2008，17，4： | 0 |
| 9 | Vortices within the Separation Region in a Decelerating Channel Flow (Effect of Inlet Velocity Gradient)显示文摘试验性的调查在吸从一面多孔的方面墙产生的速度的隧道流动在流动分离以内被转变为三维的分开的流动和旋涡。沿着方面和底部墙的流动被表面一簇方法设想。狂暴的内部流动被裂口电影探查测量包括反向的流动调查狂暴的流动。在为强壮的速度流动(吸流动 ratio:0.8 ) 的流动可视化,二个典型流动模式或者出现。一个人是底部墙附近的流动在最高的墙附近分开比流动在上游的更多并且一顺时针方向,旋涡能在分离区域被看见。另外一个是有一个逆时针方向的旋涡的颠倒流动模式。由用裂口电影探查的狂暴的流动测量,骚乱水平的二座山峰为强壮的速度流动案例被观察。这些山峰能被联系,二个流动模式上面提及。在分离以内的关键词旋涡 - 速度的隧道流动 - 狂暴的流动 - 裂口电影探查 CLC 数字 O357. | Yoichi KINOUE Toshiaki SETOGUCHI Mohammad MAMUN Norimasa SHIOMI Kenji KANEKO | 2005 | Journal of Thermal Science2005，14，4： | 0 |
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