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Unsteady Operation of New Type Turbofan Engine with Aerodynamic Torque Converter Reducing Front Fan Speed

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Journal of Thermal Science 2005年第3期14卷 206-210页

作者： Toshiaki KANEMOTO Seita SEKI Kazunori IDENO Ahmed Mohamed GALAL kyushu institute of technology Sensui 1-1 Tobata Kitakyushu 804-8550 Japan ProfessorKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 JapanKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 JapanKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 Japan

It is desired to increase the rotational speed of the core engine of the turbofan so as to get the best efficiency for the next leap of engine technology. The conventional mechanism in which the front fan is directly connected to the output shaft of a core engine, have a limit of increasing the spool speed, because the fan diameter is very large. The authors have proposed a new driving system in which the front fan is driven through the aerodynamic torque converter. The front fan can work at the best performance at slower speed while the core engine runs more efficiently at higher speed. Continuously, this paper discusses the response of the front fan in the unsteady operation of the core engine, accompanying with the internal flow. The system has the acceptable responsibility in the unsteady operation which is very important for the aircrafts.

关键词： turbofan engine front fan torque converter rotational speed

Counter-Rotating Type Tidal Stream Power Unit Boarded on Pillar(Performances and Flow Conditions of Tandem Propellers)

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Journal of Thermal Science 2013年第6期22卷 580-585页

作者： Yuta Usui Toshiaki Kanemoto Koju Hiraki kyushu institute of technology: sensui 1-1 TobataKitakyushuFukuoka804-8550Japan

The authors have invented the unique counter-rotating type tidal stream power unit composed of the tandem pro- peUers and the double rotational armature type peculiar generator without the traditional stator. The front and the rear propellers counter-drive the inner and the outer armatures of the peculiar generator, respectively. The unit has the fixftful advantages that not only the output is sufficiently higher without supplementary equipment such as a gearbox, but also the rotational moment hardly act on the pillar because the rotational torque of both propel- lers/armatures are counter-balanced in the unit. This paper discusses experimentally the performances of the power unit and the effects of the propeller rotation on the sea surface. The axial force acting on the pillar in- creases naturally with the increase of not only the stream velocity but also the drag of the tandem propellers. Be- sides, the force vertical to the stream also acts on the pillar, which is induced from the Karman vortex street and the dominant frequencies appear owing to the front and the rear propeller rotations. The propeller rotating in close to the sea surface brings the abnormal wave and the amplitude increases as the stream velocity is faster and/or the drag is stronger.

关键词： Tidal stream Counter rotation Tandem propellers Generator Armature

Floating Type Ocean Wave Power Station Equipped with Hydroelectric Unit

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Journal of Thermal Science 2013年第5期22卷 467-471页

作者： Shun Okamoto Toshiaki Kanemoto Toshihiko Umekage kyushu institute of technology Sensui 1-1 Tobata Kitakyushu 804-8550 Japan

The authors have invented the unique ocean wave power station,which is composed of the floating type platform with a pair of the floats lining up at the interval of one wave pitch and the counter-rotating type wave power unit,its runners are submerged in the seawater at the middle position of the *** profiles make the flow velocity at the runner is twice faster than that of the traditional fixed/caisson type OWC,on the ideal flow ***,the runners counter-rotate the inner and the outer armatures of the peculiar generator,respectively,and the relative rotational speed is also twice faster than the speed of the single runner/*** characteristics make the runner diameter large,namely the output higher,as requested,because the torque of the power unit never act on the floating type *** the preliminary reseach,this paper verifies to get the power using a Wells type single runner installed in the model *** runner takes the output which is affected by the oscillating amplitude of the platform,the rotational speed and the inertia force of the runner,etc.

关键词： Renewable energy Ocean wave Float Platform Counter-rotation Power unit

Turbo-pump with Isolated Two Stage Impellers for Future Rocket Engine (Trial to Drive Impellers Independently)

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Journal of Thermal Science 2008年第1期17卷 28-34页

作者： Toshiaki Kanemoto Makoto Shimojyo Ryunosuke Kawashima Daisuke Tanaka Akira Inagaki Shin Oba kyushu institute of technology:sensui 1-1 TobataKitakyushu 804-8550Japan Professor kyushu institute of technology:sensui 1-1 TobataKitakyushu 804-8550Japan DMW Corporation:Miyoshi 3-27 Mishima 411-8560Japan

To suppress the cavitation in the impellers and to make the turbo-pump lives longer, the inducer was separated from the main impeller and both impellers were driven independently. The performance of the pump and the flow conditions around the impellers were investigated experimentally and the following results were obtained. （1）The main impeller contributes to the flow interaction between the inducer and the main impeller. （2）The rotational speeds of both impellers can be controlled independently in order to suppress simultaneously the cavitation not only in the main impeller, but also in the inducer.

关键词： Turbo-pump Inducer Impeller Rocket Engine Cavitation NPSH

A novel shaft-less double suction mini pump

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Science China(Technological Sciences) 2010年第1期53卷 105-110页

作者： NISHI Michihiro kyushu institute of technology Sensui-cho 1TobataKitakyushu 804-8550Japan

A novel double suction shaft-less mini pump was developed for heat control of small energy systems in this *** mini pump impeller with an exit diameter of 40 mm was combined with the motor rotor supported by the hybrid dynamic *** specific speed of the pump was 125 min-1 m3 min-1 *** hydraulic performance of the pump was investigated experimen-tally under four rotational *** the test results,it was recognized that the pump could provide a flow discharge of 5 L/min and head of 1.5 m,which are applicable for the heat control system of a 3 kW fuel cell.A three-dimensional turbulent flow simulation in the pump was also conducted near the design *** numerical results showed that the average hydraulic performance of the mini pump was predicted *** the internal flow simulation,it was revealed that the favorable inflow condition upstream of impeller inlet could be attained by applying the double suction shaft-less design for the mini pump.

关键词： double suction seal-less shaft-less uniform inflow mini pump

Flow Through Aerodynamic Torque Converter Installed in New Type Turbofan Engine

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Journal of Thermal Science 2007年第1期16卷 14-18页

作者： Toshiaki Kanemoto Dai Sakihama Seita Seki Ahmed Mohamed Galai FengQin Hant YeXiang Xiao kyushu institute of technology： sensui 1-1 Tobata Kitakyushu 804-8550 Japan South China University of technology 381 WuShan Road Guangzhou China

It is desired to increase the core engine speed of the turbofan, to get the best efficiency for the next leap of the engine technology. The conventional mechanism in which the front fan is directly connected to the output shaft of the core engine has a limit of increasing the spool speed because the fan diameter is very large. The authors have proposed a new driving system in which the front fan is driven through the aerodynamic torque converter. The front fan can work at the conventional speed while the core engine runs more efficiently at higher speed. Continuously, in this paper, the flow through the converter is simulated numerically by CFX-5 with the k-εturbulence model of the commercial CFD code. The secondary flow occurred on the hub wall affects markedly the flow condition on the blade surfaces, and the flow along the suction surface of the driver blade separates near the trailing edge, which is deviated to the blade tip by the centrifugal force due to the wheel rotation.

关键词： turbofan engine torque converter front fan numerical simulation secondary flow separation

Variation of stress intensity factors for several interface crack problems under arbitrary material combinations

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Science China(Physics,Mechanics & Astronomy) 2012年第11期55卷 2128-2134页

作者： ZHANG Yu NODA Nao-Aki LAN Xin TAKAISHI Ken-Taro Department of Mechanical Engineering Kyushu Institute of Technology1-1 Sensui-choTobata-kuKitakyushu-shiFukuoka804-8550Japan

In this paper the variation of interface stress intensity factors is considered under arbitrary material combinations for several problems such as central internal interface cracks, periodic interface cracks, and edge interface cracks. The stress intensity factors for all these problems have been determined in terms of Dundurs＇ parameters a, b by the application of FEM in the authors＇ previous papers. In this paper, the variations of the stress intensity factors for all these problems are discussed under arbitrary a, b, then the maximum and minimum values of dimensionless stress intensity factors FI,max, FII,max, FI,min, FII,max are indicated on the map of a, b. As an example, it is found that FI,max always appears when （a, b）= （0.2,0.3）, and FI,min always appears when （a, b）= （1,0）, for the central internal interface cracks independent of crack length.

关键词： Interface crack Stress intensity factor Fracture mechanics

An experimental study on self-output-control characteristics of micro downwind rotor with coning soft blades

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Science China(Technological Sciences) 2010年第1期53卷 100-104页

作者： EGUCHI Hidenori YOSHIDA Kouichi NISHI Michihiro Sophia Engineering CO. Ltd.Kikugaoka 1-15-25KokuraminamiKitakyushu 802-0981Japan Mechanical Engineering Department Kyushu Institute of TechnologySensui-cho 1TobataKitakyushu 804-8550Japan Senior Academy Kyushu Institute of TechnologySensui-cho 1TobataKitakyushu 804-8550Japan

In this short paper,we have treated the aerodynamic performance of micro downwind rotor with coning soft blades *** test wind rotor has the tip diameter of 1.5 m and three two-dimensional NACA0018 blades of 0.15 m chord whose material is light,soft and pliable foam plastic for perfect *** the wind tunnel test,it is realized that the performance is manageable by the coning angle of the rotor *** the present case,an improvement of the performance in lower wind speeds is achieved by using the coning blade of 20°.Besides,owing to the torsional deformation of very soft blade,the self-power control characteristic is observed in every test rotor regardless of coning angle in the range of 0°-20° under the wind speed less than 12 m/s.

关键词： micro wind turbine downwind self-output-control coning angle soft blade aerodynamic performance

Relationship between microstructure and magnetic domain structure of Nd-Fe-B melt-spun ribbon magnets

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Frontiers of Materials Science 2015年第2期9卷 206-210页

作者： Masaaki TAKEZAWA Hiroyuki TANEDA Yuji MORIMOTO Department of Applied Science for Integrated System Engineering Faculty of Engineering Kyushu Institute of Technology 1-1 Sensui-cho Tobata-ku Kitakyushu Fukuoka 804-8550 Japan

The relation between the microstructure, observed using an electron probe microanalyzer, and the domain structure, observed using a Kerr microscope, was established to evaluate the effects of hot rolling and the addition of Ti-C on the c-axis orientation and the magnetization process of hot-rolled Nd-Fe-B-Ti-C melt-spun ribbons. The addition of Ti-C promotes the c-axis orientation and high coercivity in the ribbons. Elemental mapping suggests a uniform elemental distribution; however, an uneven distribution of Ti was observed in an enlarged grain with Ti-enriched points inside the grain. The reversal domains that nucleated at the Ti-enriched point inside the grain cause low coercivity.

关键词： magnetic domain microstructure Kerr effect microscope magneto-optical effect Nd-Fe-B permanent magnet