ロケットエンジン用ターボポンプの入口配管の音響効果を考慮したキャビテーションサージの一次元解析 : 第2報,キャビテーション非定常特性の位相遅れ/進み及びPSDの影響(流体工学,流体機械)

概要

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We investigated the effect of a phase lag/lead of unsteady cavitation characteristics on cavitation surge using a one-dimensional analytical model and applying the acoustic effect of the inlet pipe. The phase lag/lead of cavitation compliance was found to strongly affect the instability of cavitation surge, even though that of the mass flow gain factor does not so. An actual liquid rocket propulsion system is usually equipping a POGO suppression device (PSD). We thus modified the analytical model to consider the effect of the PSD. The frequency of cavitation surge was found to basically become the Helmholtz frequency, defined by the cavitation compliance and the length of pipeline between the PSD and the turbopump. And when the frequency of cavitation surge matches one of the acoustic resonance frequency of inlet pipeline, the cavitation surge is strongly excited.
2010-11-25