Abstract
H3-scaled Acoustic Reduction Experiments (HARE) with a scale of 2.5 % was conducted for the prediction and reduction of lift-off acoustics for the H3 launch vehicle currently under development in Japan. The effect of vehicle elevation and shape of a movable launch platform was studied in the first testing campaign. Then, acoustic reduction based on acoustic shielding and water injection system was also studied in the second testing campaign. In this presentation, results of those testing campaign will be summarized. Then, in addition to the numerical study, acoustic design of the launch complex conducted in the H3 development will be presented.
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