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Computational Cavitation Flows at Inception and Light Stages on an Axial-Flow Pump Blade and in a Cage-Guided Control Valve

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Journal of Thermal Science 2007年第4期16卷 337-345页

作者： Sumio SAITO MasahiroSHIBATA HideoFUKAE eisuke outa Tokyo National College of Technology 1220-2 Kunugida-machiHachioji-shiTokyo 193-0997 Graduate student Graduate School of Science and EngineeringWaseda University Department of Mechanical Engineering Waseda UniversityOkubo 3-4-1Shinjyuku-ku Tokyo 1600072Japan

在轴流动的泵片附近并且在一个高压力笼子类型阀门内导致的成穴流动被二维的不稳定的海军司烧分析与水泡动力学的最简单的处理模仿。液体作为水和蒸汽原子核的同类的驱散的混合的连续统被假定。分析被瞄准特别在成穴开始的舞台在水泡的... 详细信息

在轴流动的泵片附近并且在一个高压力笼子类型阀门内导致的成穴流动被二维的不稳定的海军司烧分析与水泡动力学的最简单的处理模仿。液体作为水和蒸汽原子核的同类的驱散的混合的连续统被假定。分析被瞄准特别在成穴开始的舞台在水泡的出生和倒塌期间与高振幅压力变化捕获短暂舞台。由泵片分析，地压力在是中等的，开始的成穴数字和发达成穴的地点被发现在在高发生和否定发生之间的一个宽流动范围同意试验性的结果。在阀门流动分析， 5MPa 的水压力在被归结为 2MPa，压力变化对在蒸汽压力之间的水泡倒塌作出回应比 1 KPa 和极端压力降低高，比 104， KPa 通过稳定的计算被捕获。到阀门塞子的开始水泡和压力力量的地点被发现与各自的试验性的特征同意很好。

关键词：气穴现象流变学水翼控制阀

Stall Inception Process and Prospects for Active Hub-Flap Control in Three-Stage Axial Flow Compressor

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Journal of Thermal Science 2008年第4期17卷 324-330页

作者： Tomoya OKADA Atsushi KAWAJIRI Yutaka OHTA eisuke outa Graduate school of Science and Engineering Waseda University Department of Applied Mechanics and Aerospace Engineering Waseda University

使用活跃中心拍动的可能性控制方法，它是为一台单个阶段的压缩机的一个证明旋转货摊控制方法，到 3 阶段轴的压缩机试验性地被讨论，在复杂旋转货摊开始进程被观察的地方。研究压缩机是 3 阶段并且能为转子片和定子翼改变 stagger 角... 详细信息

使用活跃中心拍动的可能性控制方法，它是为一台单个阶段的压缩机的一个证明旋转货摊控制方法，到 3 阶段轴的压缩机试验性地被讨论，在复杂旋转货摊开始进程被观察的地方。研究压缩机是 3 阶段并且能为转子片和定子翼改变 stagger 角度背景。十六个转子片 / 定子翼配置模式被变化测试蹒跚为定子翼的角度。由表面压力变化的测量，货摊开始进程被调查，测量压力变化数据为旋转货摊被用作一个预兆的信号。货摊察觉系统在一台单个阶段的压缩机用于活跃中心拍动控制的试验性的结果表演能有用地与一个更复杂的货摊开始过程在一台 3 阶段压缩机被用于那。

关键词：压缩机方法旋转式喷灌器研究

Effects of Diffuser Vane Geometry on Interaction Noise Generated from a Centrifugal Compressor

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Journal of Thermal Science 2005年第4期14卷 321-328页

作者： Yutaka OHTA Naho TAKEHARA Yasuhiko OKUTSU eisuke outa Department of Mechanical Engineering Waseda University 3-4-1 Okubo ShinjukuTokyo 169-8555Japan

相互作用音调噪音的特征与 vaned 从一台离心的压缩机放射了更弥漫被实验讨论，包括用油电影方法的可视化技术。研究注意对是的更弥漫的翼的前缘几何学被给予深深地与相互作用音调噪音的产生机制有关。散发压缩机的噪音能被在压力上升... 详细信息

相互作用音调噪音的特征与 vaned 从一台离心的压缩机放射了更弥漫被实验讨论，包括用油电影方法的可视化技术。研究注意对是的更弥漫的翼的前缘几何学被给予深深地与相互作用音调噪音的产生机制有关。散发压缩机的噪音能被在压力上升系数与某衰落一起将一些清理放在中心和更弥漫的墙的笼罩表面被几分贝减少。自从结果被第二等的流动被流动冲击并且也在更弥漫的段落以内引起的衰落，不从表演和噪音水平毁损的更弥漫的翼几何学的几种新类型为实验被开发并且利用。介绍的更弥漫的翼几何学将为更弥漫的翼设计为一些提供基本指南。关键词离心的压缩机 - vaned 更弥漫 - 相互作用噪音 - 噪音减小 CLC 数字 TK474.

关键词：离心压缩机叶片扩散体交感噪音

Unsteady Flow Field under Surge and Rotating Stall in a Three-stage Axial Flow Compressor

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Journal of Thermal Science 2011年第1期20卷 6-12页

作者： Takayuki HARA Daisuke MORITA Yutaka OHTA eisuke outa Graduate Student Graduate school of Science and EngineeringWaseda University3-4-1 OkuboShinjukuTokyo 169-8555Japan Department of Applied Mechanics and Aerospace Engineering Waseda University3-4-1 OkuboShinjukuTokyo 169-8555Japan

The unsteady flow structure between rotor blade-to-blade passages in a three-stage axial flow compressor is experimentally investigated by detailed measurements of unsteady performance characteristics,casing wall pressure fluctuations and their wavelet *** main feature of the test compressor is a capacity tank facility connected in series to the compressor outlet in order to supply compression and/or expansion waves from downstream of the *** attention is focused on the post-stall characteristics of the surge and rotating stall which occur *** influence of the compressor operating point on the unsteady performance curve shows that the surge cycle changes irregularly depending on the steady-state resistance characteristics,and the results of the wavelet analyses of the wall pressure fluctuations suggest that the surge cycle may selectively be determined by the rotating stall cell structure within the rotor cascade.

关键词：轴流压缩机非定常流场旋转失速三阶喘振转子叶片小波分析压力波动

Noise Reduction and Surge Margin Improvement Using Tapered Diffuser Vane in a Centrifugal Compressor

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Journal of Thermal Science 2010年第1期19卷 21-25页

作者： Takashi Goto Eri Ohmoto Yutaka Ohta eisuke outa Department of Applied Mechanics and Aerospace Engineering Waseda University Graduate Student Graduate School of Applied Mechanical EngineeringWaseda University

Improvement of surge margin and reduction of interaction tone noise radiated from a centrifugal compressor with a vaned diffuser is discussed from experiments and CFD *** types of one-side tapered diffuser vanes,which are shroud-and hub-side tapered vanes,were used in the *** height of the leading edge of the tapered vanes varied from 100% to 10%.Both types of tapered vanes are effective for the reduction of the interaction tone noise radiated from the compressor,because of the smaller interaction area between impeller-discharge flow and diffuser vane ***,the hub-side tapered diffuser vane suppresses the evolution of the leading-edge vortex,which causes reverse-flow in the diffuser ***,the hub-side tapered diffuser vane,which has an optimized diffuser leading edge shape,can improve the compressor pressure-rise characteristics at low-flow operation and can enlarge the surge margin.

关键词：叶片扩压器离心压缩机降噪利润率浪涌扩散抑制喘振裕度 CFD分析

Design and Prototyping of Micro Centrifugal Compressor

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Journal of Thermal Science 2003年第1期12卷 33-37页

作者： Shimpei Mizuki Gaku Minorikawa Toshiyuki Hirano Yuichiro Asaga Naoki Yamaguchi Yutaka Ohta eisuke outa 1. Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Waseda University 4-1Department of Mechanical Engineering Waseda University 4-1 Department of Mechanical Engineering Hosei University 7-2 Kajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584Japan Kajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584Japan Ohkubo 3 chome Shinjuku-ku Tokyo 169-8555JapanOhkubo 3 chome Shinjuku-ku Tokyo 169-8555Japan

In order to establish the design methodology of ultra micro centrifugal compressor,wich is the most important component of ultra micro gas turbine unit,a 10 times of the final target size model was designed,prototyped and *** problems to be solved for downsizing were examined and 2-dimensional impeller was chosen as the first model due to its *** conventional 1D prediction *** and the inverse design were *** prototyped compressor was driven by using a turbocharger and the performance characteristics were measured.

关键词：离心式压缩机设计性能

Design and Prototyping of Micro Centrifugal Compressor for Ultra Micro Gas Turbine

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Journal of Thermal Science 2005年第4期14卷 308-313页

作者： Shimpei MIZUKI Toshiyuki HIRANO Yoshiyuki KOIZUMI Gaku MINORIKAWA Hoshio TSUJITA Mitsuo IWAHARA Ronglei GU Yutaka OHTA eisuke outa Department of Mechanical Engineering Hosei University Japan Graduate School of Engineering Mechanical Engineering Hosei University 7-2 Kajinocho 3 chomeKoganei-shi Tokyo 184-8584 Japan Department of Mechanical Engineering Waseda University

以便建立设计一台极端微离心的压缩机的方法论，是一个极端微煤气的汽轮机单位的最重要的部件，最后的目标压缩机的 10 次尺寸(impeller 外部直径 40 公里，改正的旋转速度 220,000 r/min ) 被设计。为精简要解决的问题被检验，当第一... 详细信息

以便建立设计一台极端微离心的压缩机的方法论，是一个极端微煤气的汽轮机单位的最重要的部件，最后的目标压缩机的 10 次尺寸(impeller 外部直径 40 公里，改正的旋转速度 220,000 r/min ) 被设计。为精简要解决的问题被检验，当第一由于它的生产率当模特儿， 2-dimensional impeller 被选择。常规 1D 预言方法和 CFD 被使用。建原型的压缩机被以 110,000 r/min 的减少的速度使用冷空气测试。对 10 次模型，后面期末考试的 5 次尺寸充分让 3-dimensional 塑造的目标模型(impeller 外部直径 20mm，改正的旋转速度 500,000 r/min ) 被以 250,000 r/min 的减少的速度使用热气体设计并且测试。关键词离心的压缩机 - 表演特征 - 3-dimensional impeller CLC 数字 TK474.

关键词：离心压缩机气体涡轮机燃气轮机叶轮

Higher levels of the lipophilic antioxidants coenzyme Q_(10) and vitamin E in long-lived termite queens than in short-lived workers

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Insect Science 2024年第1期31卷 201-210页

作者： eisuke Tasaki Yorihiro Yamamoto Yoshihito Iuchi Department of Biological Chemistry Graduate School of Sciences and Technology for InnovationYamaguchi UniversityYamaguchiJapan School of Bioscience and Biotechnology Tokyo University of TechnologyHachiojiTokyoJapan

Termite queens and kings live longer than nonreproductive *** molecular mechanisms contributing to their long lifespan have been investigated;however,the underlying biochemical explanation remains *** Q(CoQ),a component of the mitochondrial electron transport chain,plays an essential role in the lipophilic antioxidant defense *** beneficial effects on health and longevity have been well studied in several ***,we demonstrated that long-lived termite queens have significantly higher levels of the lipophilic antioxidant CoQ_(10) than *** chromatography analysis revealed that the levels of the reduced form of CoQ_(10) were 4 fold higher in the queen's body than in the worker's *** addition,queens showed 7 fold higher levels of vitamin E,which plays a role in antilipid peroxidation along with CoQ,than ***,the oral administration of CoQ_(10) to termites increased the CoQ_(10) redox state in the body and their survival rate under oxidative *** findings suggest that CoQ_(10) acts as an efficient lipophilic antioxidant along with vitamin E in long-lived termite *** study provides essential biochemical and evolutionary insights into the relationship between CoQ_(10) concentrations and termite lifespan extension.

关键词： antioxidant defense system coenzyme Q termite queens vitamin E

Safety of rectal indomethacin(100 mg)for the prevention of post-ERCP pancreatitis in the Japanese population:A single-center prospective pilot study

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Hepatobiliary & Pancreatic Diseases International 2022年第4期21卷 406-408页

作者： Kotaro Takeshita Satoshi Asai Naoki Fujimoto Takumi Ichinona eisuke Akamine Mamoru Takenaka Department of Gastroenterology Tane General HospitalOsaka 550-0025Japan Department of Gastroenterology and Hepatology Kindai University Faculty of MedicineOsaka-Sayama 589-8511Japan

To the Editor:Endoscopic retrograde cholangiopancreatography(ERCP)causes adverse events;post-ERCP pancreatitis(PEP)is one of the frequent adverse ***,the efficacy of rectal administration of non-steroidal anti-inflamm... 详细信息

关键词： prevention ERCP drugs