ターボ機械
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
47 巻, 3 号
選択された号の論文の1件中1~1を表示しています
論文
  • 木暮 大貴, 井上 剛志, 川崎 聡, 内海 政春
    原稿種別: 論文
    2019 年 47 巻 3 号 p. 179-184
    発行日: 2019年
    公開日: 2019/10/06
    ジャーナル フリー

    For suppression of the development cost and improvement of reliability, dynamic design of fuel turbopump (FTP) rotor loaded on rocket engine is needed. For this objective, finite element model of LE-7A FTP was built, and it well-explained vibration characteristic of the synchronous vibration component in the test data of engine. However, conventional rotor model could not explain the asynchronous vibration occurred in the same test at high rotational speed range. In this paper, rotational speed dependency of rotordynamic (RD) fluid force is focused. RD fluid force acting on impeller shroud was obtained by bulk flow analysis, and its RD coefficients were modeled considering their dependency on rotational speed. Then, these rotational speed dependent RD coefficients were applied in all turbo components: inducer, seal, and turbine. FEM model of LE-7A FTP was improved considering them, and eigenvalue analysis was conducted. This result was compared with test data of engine, and it was confirmed that this FEM model considering rotational speed dependent RD coefficients can explain well the asynchronous vibration characteristics.

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