ロータダイナミック流体力の作用を考慮した高圧液体水素ターボポンプの急加速時の非定常振動解析

（回転同期成分に関する実験との比較）

抄録

One of the main problems in the development of the rocket engine is the vibration problem of the fuel turbopump(FTP). In this study, the nonstationary vibration during the fast acceleration of FTP is investigated. The rotordynamic fluid force, damping effect of the wire-mesh-damper at the support parts, and rotating cavitation force are considered in the modeling. The variation of the rotational speed and the cavitation number obtained in the experiment are used as the input for the theoretical model, and the variation of the vibration amplitude is calculated numerically. In the spectra of the experimental data, the super-harmonic components and the asynchronous components which are not proportional to the rotational speed are observed in addition to the synchronous component. Because the developed model considers only the synchronous vibration, the synchronous component is extracted from the experimental data and compared with the numerical simulation data. These experimental and numerical results agree quantitatively, and as a result, the developed theoretical model is validated.