Comparative studies on lift-off acoustic environments among flight data of the H-IIB launch vehicle, sub-scale acoustic tests and numerical simulations

A 1/42-scale acoustic tests were conducted to predict the lift-off acoustic environments of the H3 launch vehicle currently under development in Japan. The H3 acoustic level is estimated by relative comparison among sub-scale acoustic tests of the H3 / the H-IIB and flight data of the H-IIB. In this presentation, comparative studies between sub-scale tests and full-scale flight data for the H-IIB have been conducted as well as overall sound pressure level. CFD numerical simulations were also conducted to comprehend the phenomena. These provide further confidence that the sub-scale acoustic tests can favorably be used to verify the H3 lift-off acoustic environments.