検索結果 686件中 1-20 を表示

  • Aerodecelerator Performance of Flare-Type Membrane Inflatable Vehicle in Suborbital Reentry

    Takahashi Yusuke , Ha Dongheun , Oshima Nobuyuki , Yamada Kazuhiko , Abe Takashi , Suzuki Kojiro

    … The experimental drag coefficient had an almost constant value of 1.5 in the supersonic region but decreased to 1.0 in the subsonic region. … To study the detailed aerodynamics for the reentry vehicle, flow-field simulations were conducted with computational fluid dynamics techniques. … The aerodynamic force acting on the vehicle was investigated with the measured data throughout the supersonic and subsonic regions. …

    Journal of Spacecraft and Rockets 54(5), 993-1004, 2017-09

    機関リポジトリ DOI

  • The Effect of Tip Clearance on Performance of a Counter-Rotating Ducted Fan in a VTOL UAV

    RYU Minhyoung , CHO Leesang , CHO Jinsoo

    … The computational results were verified using the subsonic wind tunnel at Hanyang University. … In this study, the tip leakage flow of the counter-rotating ducted fan was analyzed in order to enhance the fan performance. … The thrust coefficient decreases with increasingly larger front rotor tip clearance due to the increase in tip leakage flow. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 60(1), 1-9, 2017

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  • 超高負荷タービン翼列内の二次元圧縮性流れの数値解析:翼形状に対する出口マッハ数の影響

    小暮 啓太

    … In the present study, the two-dimensional flows in three types of UHLTC, which are different in the maximum blade thickness, were analyzed numerically for the subsonic and the supersonic exit Mach number conditions in order to clarify the influence of the blade profile itself on the shock formation and the associated loss eneration. …

    法政大学大学院紀要 理工学・工学研究科編 57, 1-7, 2016-03-24

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  • 剥離を伴う遷音速タービン翼の非定常空力特性

    木村 泰徳 , 柴田 貴範 , 中野 晋 [他] , 尾崎 修一 , 平野 孝典 , 藤本 一郎

    … The effect of flow separation on flutter characteristics of an oscillating turbine cascade has been studied by using a linear cascade wind tunnel. … Experimental conditions range from subsonic to supersonic outflow conditions whose inlet flow angles cover attached and separated flow regimes. …

    日本ガスタービン学会誌 44(2), 117-124, 2016-03

  • 平行流を受ける柔軟片持ち平板の動的安定性に関する解析モデリングの考察

    藤田 勝久 , 松本 圭司

    … The stability of a flexible cantilevered plate subjected to a parallel flow is investigated. … The fluid is assumed to be treated as an ideal fluid in a subsonic domain, and the fluid pressure is calculated using the velocity potential theory. …

    日本機械学会論文集 82(837), 15-00658-15-00658, 2016

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  • 平行流を受ける柔軟片持ち平板の動的安定性に関する解析モデリングの考察

    藤田 勝久 , 松本 圭司

    … The stability of a flexible cantilevered plate subjected to a parallel flow is investigated. … The fluid is assumed to be treated as an ideal fluid in a subsonic domain, and the fluid pressure is calculated using the velocity potential theory. …

    日本機械学会論文集 advpub(0), 2016

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  • Numerical Characterization of Lip Thickness on Subsonic and Correctly Expanded Sonic Co-flowing Jets

    R. Naren Shankar , S. Thanigaiarasu , E. Rathakrishnan

    … Characteristics of co-flowing jets at subsonic and correctly expanded sonic Mach numbers were investigated numerically for three different lip thicknesses namely, 0.2Dp, 1.0Dp and 1.5Dp (where Dp is the exit diameter of the primary nozzle which is 10 mm). … Comparisons of numerical flow-field characteristics were made with experimental data. … It has been found that co-flow with 0.2Dp lip thickness retards the mixing of the primary jet, leading to potential core elongation. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 59(3), 134-141, 2016

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  • Aerodynamic Analysis of the Ducted Fan for a VTOL UAV in Crosswinds

    RYU Minhyoung , CHO Leesang , CHO Jinsoo

    … The calculated results were validated in the subsonic wind tunnel at Hanyang University. … The thrust, normal and side forces of the ducted fan are affected by the velocity magnitude and in-flow angle of the crosswind. … Flow separation at the duct lip occurs under hovering and crosswind conditions. … The inlet flow fields of the ducted fan are distorted by the duct lip separation. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 59(2), 47-55, 2016

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  • 異なる音速をもつ流れが共存する場に発生する膨張波に関する解析的研究

    川村 洋介 , 中川 勝文

    … Recently, by the appearance of the refrigeration air conditioning system and heat pump system using the two-phase flow ejector, the efficiency of the cycle has been largely improved in comparison with the conventional system. … In mixing section of the ejector, the suction flow of the subsonic single-phase gas refrigerant flows through the outside of the driving flow of the supersonic two-phase refrigerant. …

    日本伝熱学会論文集 24(1), 1-9, 2016

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  • Subsonic and Transonic Flow Simulation for an Oscillating T-Tail—Effects of In-plane Motion of Horizontal Tail Plane—

    ISOGAI Koji

    … In this paper, a 3D Navier-Stokes code that takes into account the in-plane motion of the HTP is developed, and the unsteady flow features of transonic flow around an oscillating T-tail are clarified, especially, in relation to the mechanism generating the rolling moment. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 59(1), 25-32, 2016

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  • Subsonic and Transonic Flow Simulation for a Wing Oscillating in Yaw and Sideslip

    ISOGAI Koji

    … In this paper, a numerical method based on 3D Navier-Stokes equations for computing the subsonic and transonic flow for a wing oscillating in yaw and sideslip is presented. … The calculated rolling moments show good agreement with the existing experimental data obtained for incompressible flow, and the effect of compressibility, especially the effects of the shock wave in transonic flow, on the rolling moment are clarified. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 59(1), 18-24, 2016

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  • 0903 ラバルノズル内における固相変化を伴う極低温混相流動特性に関する数値解析

    阿部 開史 , 石本 淳 , 落合 直哉

    … It is especially found that high-speed ultra-fine SN_2 particle is continuously generated due to the freezing of liquid nitrogen (LN_2) droplet induced by rapid adiabatic expansion of subsonic subcooled two-phase subcooled nitrogen flow passing through the Laval nozzle. …

    流体工学部門講演会講演論文集 2015, "0903-1"-"0903-2", 2015-11-07

  • B141 気液平衡二相流動方程式の定式化と一次元ノズルの挙動(OS-01:沸騰・凝縮伝熱および混相流の最近の進展(2))

    円山 重直 , 伊賀 由佳 , 岡島 淳之介

    … This paper describes the formulation of two-phase flow equation under phase equilibrium and flow dynamics in one-dimensional nozzle. … One-dimensional nozzle flow was calculated with the derived formula. … The flow transits from subsonic to supersonic by changing the area ratio. …

    熱工学コンファレンス講演論文集 2015, "B141-1"-"B141-2", 2015-10-23

  • 球状トカマクQUESTのIPN配位における遠方スクレイプオフ層の熱流束とプラズマ流

    恩地 拓己

    … Heat flux and plasma flow in the far scrape off layer (far-SOL) are examined in the inboard poloidal null (IPN) configuration on the spherical tokamak QUEST. … 1 MW/m^2) and super-sonic flow (M > … Heat flux and subsonic plasma flow in far-SOL are well correlated to the I_p-oscillation. …

    九州大学応用力学研究所所報 149, 47-50, 2015-09

    機関リポジトリ DOI

  • 609 平行流を受ける柔軟片持ち平板の動的安定性に関する解析モデリングの考察

    松本 圭司 , 藤田 勝久

    … The stability of a flexible cantilevered plate subjected to an axial flow is investigated. … The fluid is assumed to be treated as an ideal fluid in a subsonic domain, and the fluid pressure is calculated using the velocity potential theory. …

    機械力学・計測制御講演論文集 2015, "609-1"-"609-12", 2015-08-25

  • ZERO MEAN CURVATURE SURFACES IN LORENTZ-MINKOWSKI 3-SPACE AND 2-DIMENSIONAL FLUID MECHANICS

    Fujimori Shoichi , Kim Young Wook , Koh Sung-Eun , Rossman Wayne , Shin Heayong , Umehara Masaaki , Yamada Kotaro , Yang Seong-Deog

    Space-like maximal surfaces and time-like minimal surfacesin Lorentz-Minkowski 3-space R<sup>3</sup><sub>1</sub> are both characterized as zero meancurvature surfaces. We are i …

    Mathematical Journal of Okayama University 57(1), 173-200, 2015-01

    機関リポジトリ

  • Development of Ar I and Ar II Measuring System using Laser-Induced Fluorescence Methods in High-Density Helicon Plasma

    KUWAHARA Daisuke , TANIDA Yuriko , WATANABE Masaki , TESHIGAHARA Naoto , YAMAGATA Yukihiko , SHINOHARA Shunjiro

    … <p>A particle flow velocity measurement is important to realize a behavior of exhausted plasma in an electric thruster. … Laser-induced fluorescence (LIF) method provides flow velocities of ions and neutral particles through measuring velocity distribution functions of them. … 1) high-spatial resolution, 2) absolute measurement of flow velocity, 3) direction-selectivity of velocity distribution functions. …

    Plasma and Fusion Research 10(0), 3401057-3401057, 2015

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  • シンセティックジェットの三次元渦構造に及ぼすオリフィス形状の影響

    長谷川 裕晃 , 宮腰 哲弥

    … Synthetic jets are produced by periodic ejection and suction of fluid from an orifice induced by movement of a diaphragm inside a cavity, and a synthetic jet actuator is a useful tool for active flow control. … The synthetic jet actuators are low operating power, zero-net-mass-flux and very compact devices which have demonstrated their capability in modifying the subsonic flow characteristics for boundary layer flow control. …

    日本機械学会論文集 81(831), 15-00301-15-00301, 2015

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  • シンセティックジェットの三次元渦構造に及ぼすオリフィス形状の影響

    長谷川 裕晃 , 宮腰 哲弥

    … Synthetic jets are produced by periodic ejection and suction of fluid from an orifice induced by movement of a diaphragm inside a cavity, and a synthetic jet actuator is a useful tool for active flow control. … The synthetic jet actuators are low operating power, zero-net-mass-flux and very compact devices which have demonstrated their capability in modifying the subsonic flow characteristics for boundary layer flow control. …

    日本機械学会論文集 advpub(0), 2015

    J-STAGE

  • Experimental Investigation of Noise and Flow Characteristics of Supersonic Underexpanded Jet Interaction with a Coannular Tube

    IBRAHIM Mohammed K. , MIYA Nobuhiro , MORI Koichi , NAKAMURA Yoshiaki

    … = 2.2 extends up to the tube inner surface and the entire flowfield downstream of the Mach disk becomes subsonic. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 58(3), 121-128, 2015

    J-STAGE

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