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Effect of End Plates on the Performence of a Wells Turbine for Wave Energy Conversion

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Journal of Thermal Science 2006年第4期15卷 319-323页

作者： manabu takao Toshiaki Setoguchi YoichiKinoue KenjiKaneko Department of Mechanical Engineering Matsue National College of Technology 14-4 Nishiikuma-choMatsue-shiShimane 690-8518Japan Institute of Ocean Energy Saga University1 Honjo-machiSaga-shiSaga 840-8502Japan Department of Mechanical Engineering Saga University1 Honjo-machiSaga-shiSaga 840-8502Japan

以便为波浪精力变换改进井汽轮机的表演，汽轮机特征上的结束盘子的效果被模型在稳定的流动条件下面测试试验性地调查了。纳入原来的转子片的尖端的结束板比原来的片侧面稍微大。有结束盘子的井汽轮机的特征与原来的井汽轮机的那些相比... 详细信息

以便为波浪精力变换改进井汽轮机的表演，汽轮机特征上的结束盘子的效果被模型在稳定的流动条件下面测试试验性地调查了。纳入原来的转子片的尖端的结束板比原来的片侧面稍微大。有结束盘子的井汽轮机的特征与原来的井汽轮机的那些相比，即，没有结束的汽轮机板。作为结果，有结束盘子的井汽轮机的特征比原来的井汽轮机的那些优异，特征依赖于结束板的尺寸和位置，这被结束了。而且，汽轮机表演上的环形的板的效果，它环绕汽轮机并且被纳入尖端，作为一个另外的实验被调查。然而，它的设备不在改进汽轮机特征是有效的。关键词液体机械 - 自然精力 - 井汽轮机 - 结束板 - 波浪精力变换 - 海洋精力 CLC 数字

关键词：水力技术性能机械空气

A Straight-bladed Vertical Axis Wind Turbine with a Directed Guide Vane Row-Effect of Guide Vane Geometry on the Performance-

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Journal of Thermal Science 2009年第1期18卷 54-57页

作者： manabu takao Hideki KUMA takao MAEDA Yasunari KAMADA Michiaki OKI Atsushi MINODA Department of Mechanical Engineering Matsue National College of Technology Department of Mechanical Engineering Mie University

The objective of this study is to show the effect of guide vane geometry on the performance. In order to overcomethe disadvantages of vertical axis wind turbine, a straight-bladed vertical axis wind turbine (S-VAWT) witha directed guide vane row has been proposed and tested by the authors. According to previous studies, it wasclarified that the performance of the turbine can be improved by means of the directed guide vane row. However,the guide vane geometry of S-VAWT has not been optimized so far. In order to clarify the effect of guide vanegeometry, the effects of setting angle and gap between rotor blade and guide vane on power coefficient and startingcharacteristic were investigated in the experiments. The experimental study of the proposed wind turbinewas carried out by a wind tunnel. The wind tunnel with a diameter of 1.8m is open jet type. The wind velocityis 8 m/s in the experiments. The rotor has three straight blades with a profide of NACA0018 and a chord lengthof 100 mm, a diameter of 0.6 m and a blade height of 0.7 m. The guide vane row consists of 3 arc plates.

关键词：换热计算涡轮叶片湍流模型函数计算

A Twin Unidirectional Impulse Turbine for Wave Energy Conversion

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Journal of Thermal Science 2011年第5期20卷 394-397页

作者： manabu takao Akiyasu Takami Shinya Okuhara Toshiaki Setoguchi Matsue College of Technology 14-4 NishiikumaMatsueShimane 690-8518Japan Saga University 1 HonjoSagaSaga 840-8502Japan

A twin unidirectional impulse turbine has been proposed in order to enhance the performance of wave energy *** turbine system uses two unidirectional impulse turbines and their flow direction is different from each ***,the turbine characteristics have not been clarified to *** performances of a unidirectional impulse turbine under steady flow conditions were investigated experimentally by using a wind tunnel with large piston/cylinder in this ***,efficiency of the twin impulse turbine have been estimated by a quasi-steady analysis using experimental results.

关键词：冲击式水轮机单向波能转换涡轮机流动方向轮机系统准稳态活塞

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 takao Toshiaki SETOGUCHI Kenji 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

在这研究，为波浪精力变换与固定指南翼推进一台推动汽轮机的表演的改进以便完成，表演上的指南翼形状的效果被实验调查。调查被模型在稳定的流动状况下面测试执行。作为结果，因为转矩的增加，有 3D 指南翼的汽轮机的效率比有 2D 指南... 详细信息

在这研究，为波浪精力变换与固定指南翼推进一台推动汽轮机的表演的改进以便完成，表演上的指南翼形状的效果被实验调查。调查被模型在稳定的流动状况下面测试执行。作为结果，因为转矩的增加，有 3D 指南翼的汽轮机的效率比有 2D 指南翼的汽轮机的稍微优异，这被发现指南翼，尽管越过为 3D 案例的汽轮机的压力落下为 2D 案例比那稍微高。关键词液体机械 - 推动汽轮机 - 指南翼 - 波浪精力变换 CLC 数字

关键词：流体机械冲量涡轮风向导向标波能量转化率水轮机

PIV Measurements of Flows around the Wind Turbines with a Flanged-Diffuser Shroud

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Journal of Thermal Science 2008年第4期17卷 375-380页

作者： Kazuhiko Toshimitsu Koutarou Nishikawa Wataru Haruki Shinichi Oono manabu takao Yuji Ohya Dept.of Mechanical Engineering Oita National College of Technology Kawasaki Precision Machinery Ltd. Honda Motor Co. Ltd. Machine & Electronics Co. Ltd. Dept.of Mechanical Engineering Matsue National Collage of Technology Research Institute of Applied Mechanics Kyushu University

当高效之一由 Ohya 等弯屈汽轮机，有称为“风透镜汽轮机”的凸缘弥漫的笼罩这样的风汽轮机被开发。以便调查流动特征和流动加速，纸论述流动速度大小一长类型并且紧缩类型的风有由粒子图象 velocimetry 的凸缘弥漫的笼罩的汽轮机。在... 详细信息

当高效之一由 Ohya 等弯屈汽轮机，有称为“风透镜汽轮机”的凸缘弥漫的笼罩这样的风汽轮机被开发。以便调查流动特征和流动加速，纸论述流动速度大小一长类型并且紧缩类型的风有由粒子图象 velocimetry 的凸缘弥漫的笼罩的汽轮机。在长类型风汽轮机的情况中，内部流动的速度向量回答为汽轮机片旋转和旋转的没有片更弥漫在雷纳兹数字被介绍， 0.9 × 1 05。而且，流动回答在之间有或没有旋转被比较。通过 PIV 测量结果，一个人能认识到旋转的汽轮机片是影响在内部墙附近压制骚乱和流动分离更弥漫。时间平均速度向量在即时速度数据的一般水准上被做。在下游的区域有二个大旋涡更弥漫。在凸缘后面的一个旋涡是行动吸在风中到更弥漫并且提起入口流动速度。另一个大旋涡出现在 downstream。它可能作为主要流动的阻塞旋涡是行为。大阻塞旋涡不在即时速度向量是清楚的，然而，它在时间一般水准流动地里清楚地存在。在有紧缩类型的凸缘弥漫的笼罩的风汽轮机附近的流动地也被调查。在紧缩类型的汽轮机的凸缘后面的流动模式与长类型的一样。它意味着流动加速的效果被不稳定的旋涡在凸缘后面引起。有南方的时间一般水准的 CFD 和 PIV 结果的比较优化在以后紧缩类型更弥漫也被介绍。

关键词：涡轮测量法兰技术方法

Comparison of Performances of Turbines for Wave Energy Conversion

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Journal of Thermal Science 2003年第4期12卷 323-327,343页

作者： Yoichi Kinoue Toshiaki Setoguchi Tomohiko Kuroda Kenji Kaneko manabu takao Ajit Thakker Department of Mechanical Engineering Saga University 1 Honjo Saga 840-8502 Japan Dept. of Control Eng. Matsue National College of Tech. 14-4 Nishiikuma Matsue Shimane 690-8518 Japan Department of Mechanical & Aeronautical Engineering University of Limerick Limerick Ireland

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.

关键词： fluid machinery Wells turbine airfoil wave energy conversion ocean energy.

Application of Numerical Simulation Method to Predict the Performance of Wave Energy Device with Impulse Turbine

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Journal of Thermal Science 2003年第1期12卷 38-43页

作者： Ajit Thakker Thirumalisai Dhanasekaran Hammad Khaleeq Zia Usmani Ali Ansari manabu takao Toshiaki Setoguchi Department of Mechanical and Aeronautical Engineering University of Limerick LimerickDepartment of Mechanical and Aeronautical Engineering University of Limerick LimerickDepartment of Mechanical and Aeronautical Engineering University of Limerick LimerickDepartment of Mechanical and Aeronautical Engineering University of Limerick LimerickDepartment of Mathematics and Science University of Limerick LimerickDepartment of Control Engineering Matsue National College of Technology 14-4 Nishiikuma-cho Matsue-shi Shimane 690-8518Department of Mechanical Engineering Saga University 1 Honjo-machi Saga-shi Saga 840-8502 Ireland Ireland Ireland Ireland Ireland Japan Japan

This paper presents the work carried out to predict the behavior of a 0.6m impulse turbine with fixed guide vanes with 0.6hub-to-tip(H/T) ratio under real sea *** order to predict the true performance of the actual Oscillating Water Column(OWC),the numerical technique has been fine tuned by incorporating the compressibility *** surface elevation verses time history based on Pierson Moskowitz Spectra was used as the input data,Standard numerical techniques were employed to solve the non-linear behavior of the sea *** effect due to ompressibility inside the air chamber and turbine performance under unsteady and irregular flow condition has been analyzed numerically,Considering the quasi-steady assumptions unidirectional steady flow experimental data was used to simulate the turbine characteristics under irregular unsteady flow *** results show that the performance of this type of turbine is quite stable and efficiency of air chamber and the mean conversion efficiency is reduced around 8% and 5% respectively,due to compressibility inside air chamber.

关键词：脉冲透平波能器件性能数字模拟

Micro T-Mixer with Baffles: Effect of Baffle Height and Setting Angle on Mixing

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Open Journal of Fluid Dynamics 2023年第4期13卷 206-215页

作者： Miah Md Ashraful Alam Taichi Hirano Yasutaka Hayamizu Takuya Masuda Tatsuki Hamada Shinichi Morita manabu takao Department of Mechanical Engineering for Transportation Faculty of Engineering Osaka Sangyo University Osaka Japan Advanced Engineering Faculty National Institute of Technology Yonago College Tottori Japan Department of Mechanical Engineering National Institute of Technology Yonago College Tottori Japan Department of Mechanical Engineering Kitami Institute of Technology Hokkaido Japan Department of Mechanical Engineering National Institute of Technology Matsue College Shimane Japan

Chaotic mixing in eight different types of micro T-mixer flow has been studied experimentally and numerically. The present experimental study was performed to visualize two-liquid flows in a micro T-mixer with baffles. The Reynolds number, baffle height and setting angle were varied to investigate their effect on the mixing performance. Three micro T-mixer models were produced, which are several centimeters long and have a rectangular cross-section of few millimeters a side. The mixing of two-liquid was measured using the laser induced fluorescence (LIF) technique. Moreover, three-dimensional numerical simulations were conducted with the open-source CFD solver, OpenFOAM, for the same configuration as used in the experiments to investigate the detailed mechanism of the chaotic mixing. As a result, it was found that the mixing of two-liquid is greatly improved in the micro T-mixer with baffle. The baffle height and setting angle show a significant influence on the mixing performance.

关键词： Micromixer Baffles Liquid-Liquid Mixing LIF CFD

Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow

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Open Journal of Fluid Dynamics 2013年第2期3卷 36-41页

作者： Shinya Okuhara manabu takao Akiyasu Takami Toshiaki Setoguchi Department of Mechanical Engineering Matsue College of Technology Matsue Japan Institute of Ocean Energy Saga University Saga Japan Techno Center Matsue College of Technology Matsue Japan

Wells turbine has inherent disadvantages in comparison with conventional turbines: relative low efficiency at high flow coefficient and poor starting characteristics. To solve these problems, the authors propose Wells turbine with booster turbine for wave energy conversion, in order to improve the performance in this study. This turbine consists of three parts: a large Wells turbine, a small impulse turbine with fixed guide vanes for oscillating airflow, and a generator. It was conjectured that, by coupling the two axial flow turbines together, pneumatic energy from oscillating airflow is captured by Wells turbine at low flow coefficient and that the impulse turbine gets the energy at high flow coefficient. As the first step of this study on the proposed turbine topology, the performance of turbines under steady flow conditions has been investigated experimentally by model testings. Furthermore, we estimate mean efficiency of the turbine by quasi-steady analysis.

关键词： Fluid Machinery Wells Turbine Impulse Turbine Wave Energy Conversion Ocean Engineering