J051043 翼列のキャビテーション不安定現象に及ぼす加速度場の影響に関する数値解析([J05106]流体機械の研究開発におけるEFD/CFD(6))

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タイトル別名
  • J051043 Numerical Analysis of Acceleration Effect on Cavitation Instabilities in Cascade

抄録

In a turbopump inducer of liquid propellant rocket engine, cavitation is affected by unsteady acceleration in an actual launch sequence. Because cavitation instabilities, such as rotating cavitation and cavitation surge, are suppressed in the flight, it is hard to obtain a data about influence of acceleration on cavitation instabilities. Therefore in this study, through numerical simulation of a three-blade cascade, influence of acceleration on cavitation instabilities in cascade is analyzed firstly for fundamental research. Several cases of acceleration are imposed to an axial direction of the cascade which includes both upstream and downstream direction. From numerical results, it is shown that cavity volume is suppressed and cavitation capability increases by the influence of acceleration to axial-downstream direction of cascade. Then, occurrence regions of each cavitation instabilities wholly move to low cavitation number region by small degree according to increase of acceleration. Also, in an acceleration field to downstream direction, sub-synchronous rotating cavitation and rotating-stall cavitation are not observed. On the other hand, rotating stall cavitation occurs in comparatively higher cavitation number region in an acceleration field to upstream. Then, acceleration to downstream direction is safe side against cavitation instabilities and that to upstream be the opposite.

収録刊行物

  • 年次大会

    年次大会 2011 (0), _J051043-1-_J051043-5, 2011

    一般社団法人 日本機械学会

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