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Control of Transonic Flow Fields Using Local Occurrence of Non-Equilibrium Condensation

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Journal of Thermal Science 2013年第4期22卷 327-332页

作者： Junji Nagao Shigeru Matsuo tokitada hashimoto Toshiaki Setoguchi Heuy Dong Kim Department of Advanced Technology Fusion Saga University Institute of Ocean Energy Saga University School of Mechanical Engineering Andong National University

Control of supersonic flow fields with shock wave is important for some industrial fields. There are many studies for control of the supersonic flow fields using active or passive control. When non-equilibrium condensation occurs in a supersonic flow field, the flow is affected by latent heat released. Many studies for the condensation have been conducted and the characteristics have been almost clarified. Further, it was found that non-equilibrium condensation can control the flow field. In these studies, the condensation occurs across the passage of the flow field and it causes the total pressure loss in the flow field. However, local occurrence of non-equilibrium condensation in the flow field may change the characteristics of total pressure loss compared with that by the condensation across the passage of the nozzle and there are few for researches of locally occurred non-equilibrium condensation in supersonic flow field. The purpose in the present study is to clarify the effect of local occurrence of non-equilibrium condensation on the transonic flow field in a nozzle with a circular bump. As a result, local occurrence of non-equilibrium condensation reduced the shock strength and total pressure loss in the transonic flow field by flowing the moist air from trailing edge of the circular bump to the mainstream.

关键词： Compressible flow Transonic flow Shock wave Non-equilibrium condensation Circular bump

Generating and Focusing of Underwater Expansion Wave using a Silicon Resin Reflector

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Journal of Thermal Science 2013年第3期22卷 209-215页

作者： Takafumi Nakabaru tokitada hashimoto Shigeru Matsuo Toshiaki Setoguchi G.Rajesh Graduate School of Science and Engineering Saga University Department of Advanced Technology Fusion Graduate School of Science and Engineering Saga University Institute of Ocean Energy Saga University Keimyung University

In the present study, an ellipsoid reflector was designed and produced using silicon resin in order to generate and focus expansion wave in water for the purpose of a medical application. Across an expansion wave the static pressure, temperature and density decrease, as a result, negative pressure is given behind the expansion wave generated in the water, and then a tensile stress is induced. As an acoustic impedance of the silicon resin is almost similar to that of water, the interface of air-silicon resin would be regarded as the same with that of the air-water. A high voltage discharge was used as an energy source of underwater shock wave. When the underwater shock wave reflects on this interface, it is already clear that the shock wave converts to the expansion wave. The generation and focusing of the expansion wave were carried out and the phenomena were observed by flow visualization using a high-speed camera.

关键词： medical application, under water expansion wave, focusing technique, acoustic impedance

Control of the Asymmetric Flow in Rocket Nozzles

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Journal of Thermal Science 2013年第2期22卷 97-102页

作者： Shigeru Matsuo Shotaro Suetsugu Junji Nagao tokitada hashimoto Toshiaki Setoguchi Heuy Dong Kim Department of Advanced Technology Fusion Saga University Graduate School of Science & Engineering Saga University Institute of Ocean Energy Saga University School of Mechanical Engineering Andong National University

In some rocket nozzle flows, the existence of the transition from FSS to RSS and the occurrence of asymmetric flow are known in previous researches. As a result, the transition causes excessive side-loads that may damage the nozzle. Thus, it is important to investigate the method in order to control the asymmetric flow separation. In the present study, the relationship between the asymmetric separation and the rate of change of the pressure ratio with time was investigated from the point of view of the transition from FSS to RSS in the supersonic nozzle experimentally. Further, change of the flow separation by using step and cavity, and the possibility of the control was demonstrated. As a result, it was shown that the method using a cavity was effective for the control of the separation pattern.

关键词： Compressible flow Asymmetric shock wave Rocket nozzle Control Experiment

Investigation on Temperature Separation and Flow Behaviour in Vortex Chamber

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Journal of Thermal Science 2015年第2期24卷 149-154页

作者： Yuhi Matsuno Yusuke Fukushima Shigeru Matsuo tokitada hashimoto Toshiaki Setoguchi Heuy Dong Kim Graduate School of Science and Engineering Saga University Department of Advanced Technology Fusion Saga University Institute of Ocean Energy Saga University School of Mechanical Engineering Andong National University

In the previous researches, it is known that the swirl flow in circular pipe causes the temperature separation. Recently, it is shown that the temperature separation occurs in a vortex chamber when compressed air are pumped into this device from the periphery. Especially, in a cavity installed in the periphery of the chamber, the highest temperature was observed. Therefore, it is expected that this device can be used as a heat source in the engineering field. In recent researches, the mechanism of temperature separation in vortex chamber has been investigated by some researchers. However, there are few researches for the effect of diameter and volume of vortex chamber, height of central rod and position of cavity on the temperature separation. Further, no detailed physical explanation has been made for the temperature separation phenomena in the vortex chamber. In the present study, the effects of chamber configuration and position of the cavity on temperature separation in the vortex chamber were investigated experimentally.

关键词： Compressible flow Vortex chamber Cavity flow Temperature 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

Spray,droplet evaporation,combustion,and emission characteristics of future transport fuels for compression-ignition engines:A review

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 575-613页

作者： Leang So Khuong Nozomu hashimoto Osamu Fujita Division of Mechanical and Aerospace Engineering Faculty of EngineeringHokkaido UniversitySapporo 060-8628Japan Faculty of Automotive Engineering National Polytechnic Institute of CambodiaPhnom Penh 120901Cambodia

This review examines the potential of hydrogen,ammonia,and biodiesel as alternative fuels,focusing on spray dynamics,droplet evaporation,combustion,and *** offers superior combustion characteristics but faces challenges in NO_(x)*** like nonpremixed direct injection,increased intake boost pressure,and low-pressure EGR are suggested for robust hydrogen combustion in compression-ignition *** of hydrogen start of injection(SOI)and water injection(WI)are identified as effective techniques for reducing NO_(x)*** shows inferior combustion and higher NO_(x)and unburned NH_(3)emissions in the same conditions as conventional fuels with conventional *** ammonia spray and evaporation conditions is significant for optimizing an ammonia-air mixture and minimizing wall impingement and ammonia trap in the crevice,thereby improving combustion and emission *** intake pressure,injection pressure,and EGR rate,employing a turbulent jet,and preheating ammonia improve efficiency and reduce NO_(x)*** ammonia combustion requires the implementation of after-treatment systems such as NH_(3)adsorber and De NO_(x)catalysts to mitigate unburned NH_(3)and NO_(x)*** affects the fuel supply system,combustion,and emission characteristics according to its viscosity and *** injection pressure and blending with volatile fuels enhance spray and *** biodiesel preheating temperatures for the injection pump and injector are crucial for achieving the best pump capacity and spray *** utilizing biodiesel-PODE blends and investigating low-temperature biodiesel combustions,there is potential to improve thermal efficiency and PMNO_(x)***,carbon-neutral fuel adoption should be accelerated to mitigate CO_(2)emissions,highlighting the importance of combustion techniques and emissions reduction strategies.

关键词： Carbon-neutral fuels Spray formation Droplet evaporation Injection strategies Combustion efficiency Emission reduction

Regenerative medicine strategies for chronic complete spinal cord injury

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Neural Regeneration Research 2024年第4期19卷 818-824页

作者： Shogo hashimoto Narihito Nagoshi Masaya Nakamura Hideyuki Okano Department of Orthopedic Surgery Keio University School of Medicine Department of Physiology Keio University School of Medicine

Spinal cord injury is a condition in which the parenchyma of the spinal cord is damaged by trauma or various *** rapid progress has been made in regenerative medicine for spinal cord injury that was previously untreatable,most research in this field has focused on the early phase of incomplete ***,the majority of patients have chronic severe injuries;therefore,treatments for these situations are of fundamental *** reason why the treatment of complete spinal cord injury has not been studied is that,unlike in the early stage of incomplete spinal cord injury,there are various inhibitors of neural ***,we assumed that it is difficult to address all conditions with a single treatment in chronic complete spinal cord injury and that a combination of several treatments is essential to target severe ***,we established a combination therapy of cell transplantation and drug-releasing scaffolds,which contributes to functional recovery after chronic complete transection spinal cord injury,but we found that functional recovery was limited and still needs further ***,for the further development of the treatment of chronic complete spinal cord injury,we review the necessary approaches to the different pathologies based on our findings and the many studies that have been accumulated to date and discuss,with reference to the literature,which combination of treatments is most effective in achieving functional recovery.

关键词： cell transplantation chronic phase complete transection regenerative medicine spinal cord injury

Microglial response to aging and neuroinflammation in the development of neurodegenerative diseases

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Neural Regeneration Research 2024年第6期19卷 1241-1248页

作者： Tingting Han Yuxiang Xu Lin Sun Makoto hashimoto Jianshe Wei Institute for Brain Sciences Research School of Life SciencesHenan UniversityKaifengHenan ProvinceChina College of Chemistry and Molecular Sciences Henan UniversityKaifengHenan ProvinceChina Department of Basic Technology Tokyo Metropolitan Institute of Medical ScienceTokyoJapan.

Cellular senescence and chronic inflammation in response to aging are considered to be indicators of brain aging;they have a great impact on the aging process and are the main risk factors for *** the microglial response to aging and neuroinflammation in neurodegenerative diseases will help understand the importance of microglia in neurodegenerative *** review describes the origin and function of microglia and focuses on the role of different states of the microglial response to aging and chronic inflammation on the occurrence and development of neurodegenerative diseases,including Alzheimer's disease,Huntington's chorea,and Parkinson's *** review also describes the potential benefits of treating neurodegenerative diseases by modulating changes in microglial ***,inducing a shift from the neurotoxic to neuroprotective microglial state in neurodegenerative diseases induced by aging and chronic inflammation holds promise for the treatment of neurodegenerative diseases in the future.

关键词： aging Alzheimer's disease cytokines Huntington's disease microglia neurodegenerative diseases neuroinflammation neuroprotection neurotoxicity Parkinson's disease

Humanoid robot heads for human-robot interaction:A review

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Science China(Technological Sciences) 2024年第2期67卷 357-379页

作者： LI Yi ZHU LiXiang ZHANG ZiQian GUO MingFei LI ZhiXin LI YanBiao hashimoto Minoru Key Laboratory of Special Purpose Equipment and Advanced Processing Technology of Ministry of Education Zhejiang University of TechnologyHangzhou 310023China Zhejiang Provincial Key Laboratoryof Special Purpose Equipment and Advanced Processing Technology Zhejang Universityof Technology Hangzhou 310023 China Faculy of Textile Science and Technology Shinshu UniversityUeda 386-8567Japan

The humanoid robot head plays an important role in the emotional expression of human-robot interaction(HRI).They are emerging in industrial manufacturing,business reception,entertainment,teaching assistance,and tour *** recent years,significant progress has been made in the field of humanoid ***,there is still a lack of humanoid robots that can interact with humans naturally and *** review comprises a comprehensive survey of state-of-the-art technologies for humanoid robot heads over the last three decades,which covers the aspects of mechanical structures,actuators and sensors,anthropomorphic behavior control,emotional expression,and human-robot ***,the current challenges and possible future directions are discussed.

关键词： humanoid robot head anthropomorphic behaviors emotional expression human-robot interaction