年次大会講演論文集
Online ISSN : 2433-1325
会議情報
1307 高出力タービンのトルク差による LE-7A 液水ターボポンプの亜同期振動
坂爪 則夫内海 政春内田 優幸岩壺 卓三
著者情報
会議録・要旨集 フリー

p. 13-14

詳細
抄録
The fuel (liquid hydrogen) turbo-pump (FIP) of the LE-7A engine, the first stage main engine of H-IIA launch vehicles, has been attended, from the outset of development, with problems of excessive sub-synchronous whirl vibration. Test data indicate system damping of the rotor system becomes nearly zero and actions of the rotor system readily respond to external random force. The outstanding reduction in system damping was shown due primary to Thomas force induced by the high power turbine. It was generated by torque difference, depending on tip clearance distribution of rotating turbine blades. For estimation of blade force, CFD was used to predict flow in the turbine. The present study was conducted so as to find means for augmenting damping. Determination was made of seal characteristics and system damping was evaluated. It was estimated that the rotor system could become sufficiently stable by injecting seal fluid in a counter rotating direction. Hot firing test data indicate the vibration was sufficiently suppressed using this seal.
著者関連情報
© 2003 一般社団法人日本機械学会
前の記事 次の記事
feedback
Top