S0505-3-4 CFDを用いたロケット打上げ時の音響環境予測に関する研究(車両・機体・流体機械に関連した騒音問題へのアプローチと対策(3))

概要

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Since acoustic wave radiated from the rocket plume causes severe acoustic loading on the payload at lift-off, prediction and reduction of acoustic level is an important issue in the design phase. Acoustic environment is empirically predicted as of now. However, the acoustic generation mechanism is not clearly understood, which results in unsatisfactory prediction accuracy. In order to overcome the limitations of the empirical method, CFD study is carried out in JAXA. Through the comparison with the measured result in the static-firing tests, it is found that prediction accuracy of the CFD superiors to the empirical method. In addition, the acoustic generation becomes clear, which gives us the idea of developing the launch-pad which reduces acoustic level of the vehicle.
2009-09-12