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Pressure Measurement on Casing Wall and Blade Rows Interaction of Contra-Rotating Axial Flow Pump

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Journal of Thermal Science 2005年第2期14卷 142-149页

作者： toru shigemitsu Tomoya TAKANO Akinori FURUKAWA Kusuo OKUMA Satoshi WATANABE Division of Mechanical Engineering Science Kyushu University 6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581JapanDivision of Mechanical Engineering Science Kyushu University6-10-1HakozakiHigashi-kuFukuoka 812-8581Japan

An application of contra-rotating rotors has been proposed against a demand for developing higher specific speed axial flow pump. The blade rows interaction between front and rear rotors should be clarified for its stable operation and reduction of unsteady losses. In this paper, the static pressure distributions on casing wall are provided by measuring with the phase locked sampling method. The measurements are carried out for two types of the rear rotors with different blade number and chord length, and it is found that, for both types of rotors, the unsteady pressure fluctuations are more remarkable in the front rotor than in the rear rotor and they are caused by the rear rotor pressure field. The effects of pressure fluctuations will be discussed in more details toward understanding the blade rows interaction in the contra-rotating axial flow pump.

关键词：涡轮机逆旋转转子压力场叶栅交感测量方法

Study on Contra-Rotating Small-Sized Axial Flow Hydro Turbine

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Open Journal of Fluid Dynamics 2012年第4期2卷 318-323页

作者： Ryosuke Sonohata Junichiro Fukutomi toru toru shigemitsu Graduate School of Advanced Technology and Science The University of Tokushima Tokushima Japan Institute of Technology and Science The University of Tokushima Tokushima Japan

It is thought that small hydropower generation is alternative energy, and the energy potential of small hydropower is large. The efficiency of small hydro turbines is lower than that of large one, and these small hydro turbine’s common problems are out of operation by foreign materials. Then, there are demands for small hydro turbines to keep high per- formance and wide flow passage. Therefore, we adopted contra-rotating rotors which can be expected to achieve high performance and low-solidity rotors with wide flow passage in order to accomplish high performance and stable opera- tion. Final goal on this study is development of an electric appliance type small hydro turbine which has high portability and makes an effective use of the unused small hydro power energy source. In the present paper, the performance and the internal flow conditions in detail of contra-rotating small-sized axial flow hydro turbine are shown as a first step of the research with the numerical flow analysis. Then, a capability adopting contra-rotating rotors to an electric appliance type small hydro turbine was discussed. Furthermore, the high performance design for it was considered by the numeri- cal analysis results.

关键词： Small-Sized Axial Turbine Contra-Rotating Rotor Electric Appliance Renewable Energy Internal Flow

Unsteady Flow Condition between Front and Rear Rotor of Contra-Rotating Small Sized Axial Fan

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Open Journal of Fluid Dynamics 2017年第3期7卷 371-385页

作者： toru shigemitsu Hiroaki Fukuda Katsuhiko Hirosawa Institute of Science and Technology Tokushima University Tokushima Japan Graduate School of Advanced Technology and Science Tokushima University Tokushima Japan

Contra-rotating small-sized axial fans are used as cooling fans for electric equipment. In the case of the contra-rotating rotors, the blade row distance between front and rear rotors is a key parameter for the performance and stable operation. The wake and potential interference occur between the front and rear rotors and leakage flow from the front rotor tip influences on the flow condition of the rear rotor near the shroud when the blade row distance is small. Therefore, it is important to clarify the flow condition between front and rear rotors. The fan static pressure curves were obtained by the experimental apparatus and the numerical analysis was also conducted to investigate the internal flow between front and rear rotors. The leakage flow from the front rotor tip reaches the leading edge of the rear rotor when the blade row distance is small as L = 10 mm and the pressure fluctuations at the leading edge of the rear rotor tip becomes larger than those at other radial positions. In the present paper, the vorticity contour between front and rear rotors is shown and pressure fluctuations related to the leakage flow from the front rotor is investigated using the numerical analysis result. Then, suitable blade row distance for the contra-rotating small sized axial fan is discussed based on the internal flow condition.

关键词： Turbomachinery Contra-Rotating Axial Flow Fan Leakage Flow Wake

Performance and Internal Flow of Contra-Rotating Small-Sized Cooling Fan

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Open Journal of Fluid Dynamics 2018年第2期8卷 181-194页

作者： toru shigemitsu Keisuke Miyazaki Katsuhiko Hirosawa Hiroaki Fukuda Institute of Science and Technology Tokushima University Tokushima Japan Graduate School of Advanced Technology and Science Tokushima University Tokushima Japan

High pressure and large flow rate small-sized cooling fans are used for servers in data centers and there is a strong demand to increase its performance because of increase of quantity of heat from servers. Contra-rotating rotors have been adopted for some of high pressure and large flow rate cooling fans to meet the demand. The performance curve of the contra-rotating small-sized cooling fan with 40 mm square casing was investigated by an experimental apparatus and its internal flow condition was clarified by the numerical analysis. The fan static pressure of the front rotor was extremely low and it increased significantly at the rear rotor. The uniform flow was achieved at the inlet of the rear rotor because of the special shape of the casing between the front and rear rotors. On the other hand, the tip leakage flow was large enough to influence on the main flow of the test cooling fan by the design specification of high pressure with compact rotor diameter.

关键词： Cooling Fan Small-Sized Axial Fan Contra-Rotating Rotors Performance Internal Flow

Internal Flow Condition between Front and Rear Rotor of Contra-Rotating Small-Sized Axial Fan at Low Flow Rate

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Open Journal of Fluid Dynamics 2017年第4期7卷 709-723页

作者： toru shigemitsu Kensuke Tanaka Katsuhiko Hirosawa Keisuke Miyazaki Institute of Science and Technology Tokushima University Tokushima Japan Graduate School of Advanced Technology and Science Tokushima University Tokushima Japan

Contra-rotating small-sized fans are used as cooling fans for electric equipment. The internal flow condition between the front and rear rotors of the contra-rotating small-sized fan is not known well especially at the low flow rate. Furthermore, the blade row distance between the front and rear rotors is an important parameter for the contra-rotating small-sized fan and its influence on the internal flow condition is not clarified at the low flow rate. Therefore, the internal flow condition of the contra-rotating small-sized fan at the low flow rate is investigated by the numerical analysis in this research. The numerical analysis results are validated by comparing the fan static pressure curves of the numerical results to the experimental results. The internal flow condition at the low flow rate is clarified using the numerical models of the different blade row distance L = 10 mm and 30 mm. In the present paper, pressure fluctuations phase locked each front and rear rotor’s rotation are shown and the influences of the wake and the potential interference are discussed by the unsteady numerical analysis results at the low flow rate.

关键词： Small-Sized Axial Fan Contra-Rotating Rotors Wake Potential Interference Numerical Analysis

Assessing efficacy of standard impregnation techniques on die-cast aluminum alloys using X-ray micro-CT

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China Foundry 2024年第3期21卷 276-286页

作者： Ajith Bandara Koichi Kan Katanaga Yusuke Natsuto Soga Akifumi Koike toru Aoki Hamamatsu TSC Chuo Hatsumei Institute322 lida-choMinami-kuHamamatsu435-0028Japan Graduate School of Medical Photonics ShizuokaUniversityJohoku 3-5-1HamamatsuShizuoka432-8561Japan ANSeeN Inc Johoku 3-5-1HamamatsuShizuoka432-8561Japan Research Institute of Electronics ShizuokaUniversityJohoku 3-5-1HamamatsuShizuoka432-8561Japan

Utilizing lightweight Al alloys in various industrial applications requires achieving precise pressure tightness and leak *** pressure impregnation(VPI)with thermosetting polymers is commonly used to address leakage defects in die-cast Al *** this study,the efficacy of the VPI technique in sealing alloy parts was investigated using a combination of nondestructive micro X-ray computed tomography(micro XCT)and a standard leak *** results demonstrate that the commonly used water leak test is insufficient for determining the sealing ***,micro XCT shows distinct advantages by enabling more comprehensive *** reveals the presence of a low atomic number impregnates sealant within casting defects,which has low grey contrast and allows for visualizing primary leakage paths in *** effective atomic number of impregnated resin is 6.75 and that of Al alloy is 13.69 by dual-energy X-ray *** research findings will contribute to enhancing the standard VPI process parameters and the properties of impregnating sealants to improve quality assurance for impregnation in industrial metals.

关键词： nondestructive testing Al alloy die-casting vacuum pressure impregnation micro X-ray computed tomography duel-energy X-ray CT

Improvement of histone deacetylase inhibitor efficacy by SN38 through TWIST1 suppression in synovial sarcoma

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Cancer Innovation 2024年第2期3卷 80-95页

作者： Satoru Sasagawa Jun Kumai toru Wakamatsu Yoshihiro Yui Molecular Biology Laboratory Research InstituteNozaki Tokushukai HospitalDaitoOsakaJapan Sarcoma Treatment Laboratory Research InstituteNozaki Tokushukai HospitalDaitoOsakaJapan Department of Musculoskeletal Oncology Service Osaka International Cancer InstituteOsakaJapan

Background:Synovial sarcoma(SS)is an SS18-SSX fusion gene-driven soft tissue sarcoma with mesenchymal characteristics,associated with a poor prognosis due to frequent metastasis to a distant organ,such as the *** deacetylase(HDAC)inhibitors(HDACis)are arising as potent molecular targeted drugs,as HDACi treatment disrupts the SS oncoprotein complex,which includes HDACs,in addition to general HDACi *** provide further molecular evidence for the advantages of HDACi treatment and its limitations due to drug resistance induced by the microenvironment in SS cells,we examined cellular responses to HDACi treatment in combination with two-dimensional(2D)and 3D culture ***:Using several SS cell lines,biochemical and cell biological assays were performed with romidepsin,an HDAC1/2 selective ***38 was concomitantly used as an ameliorant drug with romidepsin ***,apoptosis induction,and MHC class I polypeptide-related sequence A/B(MICA/B)induction were monitored to evaluate the drug *** addition to the conventional 2D culture condition,spheroid culture was adopted to evaluate the influence of cell-mass microenvironment on ***:By monitoring the cellular behavior with romidepsin and/or SN38 in SS cells,we observed that responsiveness is diverse in each cell *** the apoptotic inducible cells,co-treatment with SN38 enhanced cell *** nonapoptotic inducible cells,cytostasis and MICA/B induction were observed,and SN38 improved MICA/B induction *** a novel efficacy of SN38,we revealed TWIST1 suppression in SS *** the spheroid(3D)condition,romidepsin efficacy was severely restricted in TWIST1-positive *** demonstrated that TWIST1 downregulation restored romidepsin efficacy even in spheroid form,and concomitant SN38 treatment along with romidepsin reproduced the ***:The current study demonstrated the benefits and concerns of using HDACi for SS treatment in 2D and

关键词： HDAC inhibitor MICA/B SN38 spheroid synovial sarcoma TWIST1

Clinical Evaluation of Two Interferon-Gamma Release Assays for Diagnostic Tests of Tuberculosis Infection in a Tertiary Hospital: Clinical Evaluation of Two IGRAs for TB Infection

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Journal of Tuberculosis Research 2024年第3期12卷 129-141页

作者： Yoshihiro Kobashi toru Oga Department of Respiratory Medicine Kawasaki Medical School Kurashiki Japan

Background: The aim of this study was to evaluate the usefulness of two interferon-gamma release assays (IGRAs) (QuantiFERON-TB Plus (QFT-plus) and *** assay) for patients suspected of having tuberculosis (TB) infection as supportive methods for diagnosing TB. Patients and Methods: The subjects consisted of 45 patients who required clinical differentiation of TB disease from June 2019 to August 2023. The final clinical diagnoses were: 14 patients with active TB disease, 4 with latent TB infection (LTBI), 17 with old (cured) TB disease, and 10 with pulmonary nontuberculous mycobacterial (NTM) disease. We used the two IGRAs for these patients and evaluated the data according to the manufacturer’s guidelines for interpretation or FDA-approved cutoffs. Results: Among the total of 14 patients with active TB disease (mean age: 64 years old, male: 9, and female: 5), a positive response was noted in 10 patients (71%) on QFT-plus and 9 (64%) on ***. Four patients with a negative response on QFT-plus and *** were elderly or cancer patients with lymphocytopenia or hypoalbuminemia. All four patients with LTBI showed a positive response (100%) on both QFT-plus and ***. Among the seventeen patients with old (cured) TB disease, a positive response was noted in 8 patients (47%) on QFT-plus and 9 (53%) on ***. All patients with pulmonary NTM disease showed a negative response on both QFT-plus and ***. Conclusions: A false-negative response on QFT-plus as well as *** was recognized in elderly patients and patients with an immunosuppressed condition, and half of patients with old (cured) TB showed no negative conversion after the completion of treatment through this study. Although it was recently reported that the positive response rate on QFT-plus of patients with active TB disease was high, we consider it necessary to be careful in diagnosing TB infection using IGRAs for patients with severe underlying diseases in a tertiary hospital based

关键词： QFT-Plus T-SPOT.TB Diagnosis of Tuberculosis Tertiary Hospital

Superconducting joints using reacted multifilament MgB_(2)wires:A technology toward cryogen-free MRI magnets

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Journal of Magnesium and Alloys 2024年第1期12卷 159-170页

作者： Dipak Patel Akiyoshi Matsumoto Hiroaki Kumakura Yuka Hara toru Hara Minoru Maeda Hao Liang Yusuke Yamauchi Seyong Choi Jung Ho Kim Md Shahriar A.Hossain School of Mechanical and Mining Engineering The University of QueenslandSt LuciaQueensland 4072Australia National Institute for Materials Science(NIMS) 1-2-1 SengenTsukubaIbaraki 305-0047Japan Department of Electrical Engineering and Kangwon High Magnetic Field Center Institute of Quantum Convergence TechnologyKangwon National UniversityGangwon 24341Republic of Korea Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandSt LuciaQueensland 4072Australia Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityNagoyaAichi 464-8603Japan Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongNorth WollongongNew South Wales 2500Australia

The development of superconducting joining technology for reacted magnesium diboride(MgB_(2))conductors remains a critical challenge for the advancement of cryogen-free MgB_(2)-based magnets for magnetic resonance imaging(MRI).Herein,the fabrication of superconducting joints using reacted carbon-doped multifilament MgB_(2)wires for MRI magnets is *** achieve successful superconducting joints,the powder-in-mold method was employed,which involved tuning the filament protection mechanism,the powder compaction pressure,and the heat treatment *** fabricated joints demonstrated clear superconducting-to-normal transitions in self-field,with effective magnetic field screening up to 0.5 T at 20 *** evaluate the interface between one of the MgB_(2)filaments and the MgB_(2)bulk within the joint,serial sectioning was conducted for the first time in this type of superconducting *** serial sectioning revealed space formation at the interface,potentially caused by the volume shrinkage associated with the MgB_(2)formation or the combined effect of the volume shrinkage and the different thermal expansion coefficients of the MgB_(2)bulk,the filament,the mold,and the sealing *** findings are expected to be pivotal in developing MgB_(2)superconducting joining technology for MRI magnet applications through interface engineering.

关键词： Mg B2 superconducting joint MgB_(2)conductor MRI applications Cryogen-free magnet Persistent-mode operation