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Corner Separations around a NACA65 Blade in a Decelerating Flow (Experimental Investigations by Five-Hole Probe and PIV)

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Journal of Thermal Science 2013年第1期22卷 23-28页

作者： Yoichi Kinoue Ryutaro Ohhira norimasa shiomi Toshiaki Setoguchi Department of Mechanical Engineering Saga University Institute of Ocean Energy Saga University

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 ***-dimensional calculations show that the NACA65 cascade flow that has 45 *** turning,1.24 of solidity and 17 *** stagger angle is equivalent to the channel flow that has 14 *** stagger angle in terms of pitchwise blade *** 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 ***,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 *** 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.

关键词： corner separation NACA65 blade decelerating channel flow five-hole probe PIV

Annular Supersonic Swirling Flows with Heterogeneous Condensation

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Journal of Thermal Science 2016年第6期25卷 518-525页

作者： Yusuke FUKUSHIMA Shigeru MATSUO norimasa shiomi Toshiaki SETOGUCHI Graduate School of Science & Engineering Saga University Department of Advanced Technology Fusion Saga University Department of Mechanical Engineering Saga University Institute of Ocean Energy Saga University

In recent years,separating and extracting technologies of condensate gas have been developed by combining a swirl flow with non-equilibrium condensation phenomena of condensate gas generated in a supersonic *** technology can reduce the size of the device and does not use ***,there are many unresolved problems for performance of the separation,extraction and operating *** it is necessary to research further in order to improve the performance of the *** the present study,the numerical study was carried out to clarify the effect of the heterogeneous condensation on the characteristics of the swirling flow field in a supersonic annular nozzle,and the differences between homogeneous condensation and heterogeneous condensation in the flow *** the results,it is found that the condensation flow with a swirl affects the position of sonic line,the generating position of condensate and the radial distribution ratio of liquid phase.

关键词： condensation supersonic heterogeneous condensate viscosity chemicals generating annular nozzle regardless

Vortices within the Separation Region in a Decelerating Channel Flow (Effect of Inlet Velocity Gradient)

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Journal of Thermal Science 2005年第4期14卷 341-345页

作者： Yoichi KINOUE Toshiaki SETOGUCHI Mohammad MAMUN norimasa shiomi Kenji KANEKO Department of Mechanical Engineering Saga University1HonjoSaga840-8502Japan

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.

关键词： vortices within the separation decelerating channel flow turbulent flow split-film probe

Flow Fields with Tip Leakage Vortex in a Small Axial Cooling Fan

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Journal of Thermal Science 2008年第2期17卷 156-162页

作者： norimasa shiomi Ying zi Jin Kenji Kaneko Yoichi Kinoue T. Setoguchi Department of Mechanical Engineering Saga University 1 Honjo-machi Saga 840-8502 Japan Institute of Mechatromcs Zhejiang Sci-Tech University Hangzhou 310018 China

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 us- ing 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

关键词： Axial fan cooling fan internal flow and tip leakage vortex

Flow Fields with Vortex in a Small Semi-open Axial Fan

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Journal of Thermal Science 2009年第4期18卷 294-300页

作者： norimasa. shiomi Yoichi Kinoue Ying zi Jin Toshiaki Setoguchi Kenji Kaneko Department of Mechanical Engineering Saga University 1 Honjo-machi Saga 840-8502 Japan Institute of Mechatronics Zhejiang Sci-Tech University Xiasha Higher Educational Zone Hangzhou 310018 China

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 lmm （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.

关键词： fan semi-open type vortex tip clearance

Experimental Investigation of Stator Flow in Diagonal Flow Fan

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Journal of Thermal Science 2008年第4期17卷 356-360页

作者： Jie Wang Yoichi Kinoue norimasa shiomi Toshiaki Setoguchi Kenji Kaneko Yingzi Jin Zhejiang Sci-Tech University Xiasha Higher Educatinal Zone Hangzhou 310018 China Department of Mechanical Engineering Saga University 1 Honjo Saga 840-8502 Japan

Experimental investigations were conducted for the internal flow of the stator of the diagonal flow fan. Comer 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 comer wall. At low flow rate of 80-90 % of the design flow rate, the comer separation between the suction surface and the hub surface can be found, which become widely spread at 80 % of the design flow rate.

关键词： diagonal flow rotor axial flow stator internal flow corner separation

Effect of Nozzle Inlet Shape on Annular Swirling Flow with Non-Equilibrium Condensation

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Journal of Thermal Science 2015年第4期24卷 344-349页

作者： Yusuke FUKUSHIMA Shigeru MATSUO Toshiaki SETOGUCHI norimasa shiomi Tokitada HASHIMOTO Heuy Dong KIM and Shen YU Graduate School of Science & Engineering Saga University Department of Advanced Technology Fusion Saga University Institute of Ocean Energy Saga University Department of Mechanical Engineering Saga University School of Mechanical Engineering Andong National University Institute of Engineering Thermophysics Chinese Academy of Science

Recently,by combining a swirl flow with non-equilibrium condensation phenomena of condensate gas generated in a supersonic flow,a separating and extracting techniques of condensate gas have been *** technique can reduce the size of the device and don't use *** the present study,by using a non-equilibrium condensation phenomenon of moist air occurred in the supersonic flow in the annular nozzle composed of an inher body and an outer nozzle with a swirl,the possibility of separation of the condensable gas and the effect of shape of nozzle inlet on the flow field were examined numerically.

关键词： compressible flow non-equilibrium condensation supersonic annular nozzle swirl flow simulation

Effect of Pre-Swirling Flow on Performance and Flow Fields in Semi-Opened Axial Fan

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Open Journal of Fluid Dynamics 2023年第2期13卷 113-121页

作者： norimasa shiomi Pin Liu Yoichi Kinoue Department of Mechanical Engineering Saga University Saga Japan Department of Mechanical Engineering NIT Matsue College Shimane Japan

In this study, we tried to improve the performance by giving a pre-swirling flow to the radial inflow that occurred in the semi-opened axial fan. In addition, the flow fields of rotor outlet were clarified experimentally, and the effect of pre-swirling flow was considered. The experiment was carried out using a performance test wind tunnel with a square cross section of 880 mm. Three types of casings were prepared, in which the blade tip protruded 0%, 20%, and 40% of the meridional chord length. They were called R25, R15, and R05, respectively, in the casing bellmouth model code. Guide blades for generating a pre-swirling flow were installed on the vertical wall surface of the casing. In addition, a vertical wall was installed 60% upstream of the meridional chord length as an obstacle to prevent axial inflow. The velocity fields of the rotor outlet were measured using a hot-wire anemometer. From the results, the pre-swirling flow did not significantly affect the fan performance. When there was no obstacles wall upstream, there was a partial increase in efficiency, but the difference was not so large. When there was an obstacle wall upstream, the efficiency increased overall in the case of R15, but in the case of R05, the efficiency increased only in the low flow rate region, and conversely decreased in the high flow rate region. By observing the blade outlet flow fields when the performance was improved, it was confirmed that the influence of the tip leakage vortex was weakened.

关键词： Axial Fan Semi-Opened Narrow Space Pre-Swirling Flow Fan Performance

Comparison of One-Dimensional Analysis with Experiment for CO<sub>2</sub>Two-Phase Nozzle Flow

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Open Journal of Fluid Dynamics 2014年第5期4卷 415-424页

作者： Wakana Tsuru Satoshi Ueno Yoichi Kinoue norimasa shiomi Department of Mechanical Engineering Saga University Saga Japan

The aim of this study is to investigate CO2 two-phase nozzle flow in terms of both experimental and analytical aspects for the optimum design of two-phase flow nozzle of CO2 two-phase flow ejector. In the experiment, it is measured that the temperature profile in the stream-wise direction of a divergent-convergent nozzle through which CO2 in the supercritical pressure condition is blown down into the atmosphere. In the analysis, a one-dimensional model which assumes steady, adiabatic, frictionless, and equilibrium is proposed. In the convergent part of the nozzle the flow is treated as single-phase flow of liquid, whereas in the divergent part the flow is treated as separated two-phase flow with saturated condition. The analytical results indicate that the temperature and the pressure decrease rapidly in the divergent part, and the void fraction increases immediately near the throat. Although this analysis is quite simple, the analytical results can follow the experimental results well within this study.

关键词： Carbon Dioxide High-Speed Nozzle Flow Gas-Liquid Two-Phase Flow with Phase Change Blow down Test One-Dimensional Analysis