Space Shuttle Model acoustic/overpressure test results

Abstract

The SSV's engine-generated acoustics and ignition overpressure environments have been long considered as severe dynamic inputs to a reusable aero-frame structure with a payload located in close proximity to the propulsion systems. The definition of these environments and the noise suppression techniques that are required for SSV launch have been provided from a dynamically scaled hot propulsion model. The scale factor is 6.4% of the Shuttle with the vehicle launch facility with exhaust deflector and duct geometry being simulated. Water injection into the hot exhausts is also scaled for sound suppression for both on-pad and liftoff cases. The environments measured on model are then scaled to provide launch vehicle environments for vehicle, launch facility, and farfield areas. Overpressure environments from SRB ignition are also acquired from over 100 measurements on the vehicle and launch facility. Suppression techniques are being investigated for Western Test Range (WTR) launchers and for thrust augmented configurations of the Shuttle.