ターボ機械
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
40 巻, 12 号
選択された号の論文の5件中1~5を表示しています
論文
  • (第1報:QFDを用いた重要設計パラメータの抽出)
    瀧田 純也, 福岡 勝, 國枝 麿, 船﨑 健 一, 内海 政春
    原稿種別: 論文
    2012 年 40 巻 12 号 p. 705-714
    発行日: 2012年
    公開日: 2015/04/09
    ジャーナル フリー
    An application of the QFD method for the design of rocket turbopump turbines is presented. Generally, rocket turbopump turbines are designed as supersonic impulse turbines, and because of their special specifications, improvements in turbine efficiency and robustness are difficult. Further improvement in turbine design techniques is needed because turbine performance directly affects engine performance and reliability in a liquid rocket propulsion system. In this study, QFD is positioned as a means for selecting the design parameters in the parametric design process. Therefore, the purpose of QFD is to visualize the voice of the market(market needs),which are essential for parametric design of supersonic turbines to identify important design parameters. In this paper, the QFD results for the identification of important design parameters and for the visualization of the market needs which was obtained from rocket engine stakeholders are discussed.
  • 米澤 宏一, 小西 大介, 宮川 和芳, Peter DOERFLER, Francois AVELLAN, 辻本 良信
    原稿種別: 論文
    2012 年 40 巻 12 号 p. 715-724
    発行日: 2012年
    公開日: 2015/04/09
    ジャーナル フリー
    Model tests and CFD were carried out to find out the cause of cavitation surge in hydraulic power plants. In experiments the cavitation surge was observed at flow rates higher and lower than the swirl free flow rate, both with and without a surge tank placed just upstream of the inlet volute. An unsteady CFD was carried out with two boundary conditions:(1)the flow rate is fixed to be constant at the inlet volute, (2)the total pressure is kept constant at the volute inlet, corresponding to the experiments without/with the surge tank. The surge was observed with both boundary conditions at both higher and lower flow rates. Discussions as to the cause of the surge are made based on additional tests with an orifice at the diffuser exit, and with the diffuser replaced with a straight pipe.
  • 辻本 良信, 田中 宏, Peter DOERFLER, 米澤 宏一, 鈴木 隆起, 牧川 佳祐
    原稿種別: 論文
    2012 年 40 巻 12 号 p. 725-734
    発行日: 2012年
    公開日: 2015/04/09
    ジャーナル フリー
    The effects of acoustic resonance and volute geometry on phase resonance are studied theoretically and experimentally using a centrifugal fan. One dimensional theoretical model is developed taking account of the reflection from the discharge pipe end. It was found that the phase resonance occurs, even with the effects of acoustic resonance, when the rotational speed of rotor-stator interaction pattern agrees with the sound velocity. This was confirmed by experiments with and without a silencer at the discharge pipe exit. The pressure wave measurements showed that there are certain effects of the crosssectional area change of the volute which is neglected in the one dimensional model. To clarify the effects of area change, experiments were carried out by using a ring volute with a constant area.
  • 米澤 宏一, 青野 淳, 姜 東赫, 堀口 祐憲, 川田 裕, 辻本 良信
    原稿種別: 論文
    2012 年 40 巻 12 号 p. 735-744
    発行日: 2012年
    公開日: 2015/04/09
    ジャーナル フリー
    The transfer matrix and unsteady cavitation characteristics, cavitation compliance and mass flow gain factor, of cavitating inducer were evaluated by CFD using commercial software. Quasi-steady values of cavitation compliance and mass flow gain factor were obtained first by using steady calculations at various flow rate and inlet cavitation number. Then unsteady calculations were made to determine the transfer matrix and the cavitation characteristics. The results are compared with experiments to show the validity of calculations.
  • (曲面流路を用いた水流方向制御の検討)
    飯尾 昭一郎, 大池 真悟, 山崎 正浩, 木本 海花, 片山 雄介, 池田 敏彦
    原稿種別: 論文
    2012 年 40 巻 12 号 p. 745-753
    発行日: 2012年
    公開日: 2015/04/09
    ジャーナル フリー
    Performance of open type cross-flow runner utilizing waterfall is strongly affected by flow impinging position. It is therefore necessary to keep the stable generation by changing the runner position or controlling the waterfall direction. The former is unrealistic method because of sophisticated mechanism to move the runner. Accordingly, this study focused on the flow direction control method by using curved channel. Flow visualization and runner performance measurement were conducted about two different curvature channels. As a result, it was clarified that the flow direction control method was effective to keep a stable generation when the flow rate changed widely. Namely, the adjustment of runner position is not necessary even when the flow rate changes. This is an extreme advantage from a practical application viewpoint.
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