Abstract
The MARTEI. test rig of Centre National d'Etudes Spatiales, located in Poitiers, France, is designed to study the noise of highly supersonic hot jets under conditions approaching those of a launch vehicle at liftoff. The nonanechoic character of the site (concrete ground, large plate representing the launch pad) requires a specific measurement device in order to calculate the sound power radiated by the jets. The integration process defined by ONERA is discussed and is tested using a freejet noise model derived from the work of NASA, which has been extended to the jet-plate interaction by assuming that the sound power radiated by the jet remains unchanged in this case. First results concerning jets of various velocities seem to confirm the preceding hypothesis and the reliability of the method used.
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