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Aero-Thermal Performances of Leakage Flows Injection from the Endwall Slot in Linear Cascade of High-Pressure Turbine

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Journal of Thermal Science 2015年第1期24卷 49-57页

作者： Wan Aizon W Ghopa Zambri Harun ken-ichi funazaki Takemitsu Miura Department of Mechanical and Materials Engineering Universiti Kebangsaan Malaysia Department of Mechanical Engineering Iwate University

The existence of a gap between combustor and turbine endwall in the real gas turbine induces to the leakages phenomenon. However, the leakages could be used as a coolant to protect the endwaU surfaces from the hot gas since it could not be completely prevented. Thus, present study investigated the potential of leakage flows as a function of film cooling. In present study, the flow field at the downstream of high-pressure turbine blade has been investigated by 5-holes pitot tube. This is to reveal the aerodynamic performances under the influenced of leakage flows while the temperature measurement was conducted by thermoehromic liquid crystal （TLC）. Expe- rimental has significantly captured theaerodynamics effect of leakage flows near the blade downstream. Further- more, TLC measurement illustrated that the film cooling effectiveness contours were strongly influenced by the secondary flows behavior on the endwall region. Aero-thermal results were validated by the numerical simulation adopted by commercial sottware, ANSYS CFX 13. Both experimental and numerical simulation indicated almost similar trendinaero and also thermal behavior as the amount of leakage flows increases.

关键词： endwall fllmcooling leakage flows secondary flows aerodynamic loss film cooling effectiveness

Experimental and Numerical Investigation on Compressor Cascade Flows with Tip Clearance at a Low Reynolds Number Condition

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Journal of Thermal Science 2011年第6期20卷 481-485页

作者： Hiromasa Kato Hideo Taniguchi Kazunari Matsuda ken-ichi funazaki Dai Kato Guillaume Pallot Department of Mechanical Engineering Faculty of EngineeringIwate University Aerodynamic Technology Group IHI Corporation

High flow rate aeroengines typically employ axial flow compressors, where aerodynamic loss is predominantly due to secondary flow features such as tip leakage and comer vortices. In very high altitude missions, turbo- machinery operates at low density ambient atmosphere, and the recent trend toward more compact engine core inevitably leads to the reduction of blade size, which in turn increases the relative height of the blade tip clearance. Low Reynolds number fiowfield as a result of these two factors amplifies the relative importance of secondary flow effects. This paper focuses on the behavior of tip leakage flow, investigating by use of both experimental and numerical approaches. In order to understand the complex secondary flow behavior, cascade tests are usually conducted using intrusive probes to determine the loss. However relatively few experimental studies are pub- lished on tip leakage flows which take into account the interaction between a rotating blade row and its casing wall. Hence a new linear cascade facility has been designed with a moving belt casing in order to reproduce more realistic flowfield as encountered by a rotating compressor row. Numerical simulations were also performed to aid in the understanding of the complex flow features. The experimental results indicate a significant difference in the flowfield when the moving belt casing is present. The numerical simulations reveal that the leakage vortex is pulled by the shearing motion of the endwall toward the pressure side of the adjacent blade. The results highlight the importance of casing wall relative motion in analyzing leakage flow effects.

关键词： compressor tip leakage flow

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用于未来月球探测的ILOM技术现状

深空探测学报 2014年第3期1卷 200-204页

作者： Hideo HANADA Seiitsu TSURUTA Kazuyoshi ASARI Hiroshi ARAKI Hirotomo NODA Shingo KASHIMA ken-ichi funazaki Fuyuhiko KIKUCHI Koji MATSUMOTO Yusuke KONO Hiroo KUNIMORI Sho SASAKI 平劲松日本国立天文台RISE研究室综合研究大学院大学天文学部岩手大学工学院国立天文台水泽VLBI观测站国立信息通信技术研究院无线网络研究所大阪大学地球与空间科学部中科院国家天文台

使用面包板模型和仿真方法,在实验室内研究月球指向就位测量望远镜(ILOM)的基本特征,如望远镜星像中心点位置精度、温度效应、倾斜以及地面震动的影响。使用这个技术预期在月球表面观测月球自转时可以达到1ms的精度。将在地面上开展测... 详细信息

使用面包板模型和仿真方法,在实验室内研究月球指向就位测量望远镜(ILOM)的基本特征,如望远镜星像中心点位置精度、温度效应、倾斜以及地面震动的影响。使用这个技术预期在月球表面观测月球自转时可以达到1ms的精度。将在地面上开展测试验证观测以全面评价达到优于0.1″观测精度目标所需条件和特征。

关键词：月球 ILOM 望远镜照相天顶筒水银槽

Development of a digital zenith telescope for advanced astrometry

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Science China(Physics,Mechanics & Astronomy) 2012年第4期55卷 723-732页

作者： HANADA Hideo ARAKI Hiroshi TAZAWA Seiichi TSURUTA Seiitsu NODA Hirotomo ASARI Kazuyoshi SASAKI Sho funazaki ken'ichi SATOH Atsushi TANIGUCHI Hideo KIKUCHI Mamoru TAKAHASHI Tomoe YAMAZAKI Atsumu PING JinSong KAWANO Nobuyuki PETROVA Natalia GOUDA Naoteru YANO Taihei YAMADA Yoshiyuki NIWA Yoshito KONO Yusuke IWATA Takahiro National Astronomical Observatory of Japan Iwate-ken 0230861Japan Department of Engineering Department Iwate UniversityIwate 0208550Japan National Astronomical Observatory Chinese Academy of SciencesBeijing 100012China Oshu Space&Astronomy Museum Iwate-ken 0230861Japan Department of Astronomy Kazan State UniversityKazan 420008Russia Section of Graduate School of Science Division of Physics and Astronomy Kyoto UniversityKyoto 6068501Japan Japan Aerospace Exploration Agency Kanagawa 2525210Japan

Like other optical astrometric techniques,the Photographic Zenith Tube(PZT) has played a key role in the past observations of the Earth rotation,and it also has a potential to be applied to several other observations by taking advantage of automatic observations with self compensation of tilt of the *** here propose In-situ Lunar Orientation Measurement(ILOM) to study lunar rotational dynamics by direct observations of the lunar rotation from the lunar surface by using a small telescope like PZT with an accuracy of 1 milli-seconds of arc(1 mas) in the post-SELENE *** second application is to obtain local gravity field on the Earth by combining deflection of the vertical measured by PZT and the position measured by Global Positioning System(GPS) or Global Navigation Satellite System(GNSS).The accuracy required for this purpose is not as strict as *** have already developed a Bread Board Model(BBM) of the telescope for ILOM and made some experiments in order to know the performance of the driving mechanism under a similar condition to the lunar environment showing high vacuum,large temperature change and dusty *** have also shown that it is possible to correct the effects of uniform temperature change upon the optical system by using a simple model with an accuracy of better than 1 *** model has the potential to attain the accuracy of 1 mas,based on the results of the experiments and the simulations.

关键词： high accuracy orbit determination SAR LRS SELENE