ロータダイナミック流体力の回転速度依存性を考慮した固有値解析によるLE-7A液体水素ターボポンプロータの非同期振動成分の考察

書誌事項

タイトル別名
  • Study on the Asynchronous Vibration Components of LE-7A Liquid Hydrogen Turbopump Rotor by Eigenvalue Analysis Considering Rotational Speed Dependency of Rotordynamic Fluid Force
  • ロータダイナミック リュウタイリョク ノ カイテン ソクド イソンセイ オ コウリョ シタ コユウチ カイセキ ニ ヨル LE-7A エキタイ スイソ ターボポンプロータ ノ ヒドウキ シンドウ セイブン ノ コウサツ

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抄録

<p>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.</p>

収録刊行物

  • ターボ機械

    ターボ機械 47 (3), 179-184, 2019

    一般社団法人 ターボ機械協会

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