Abstract
ARIANE 5 launcher includes two strap on solid rocket motors named MPS (Moteur à Propergol Solide), developed by EUROPROPULSION, a common subsidiary between SEP and BPD. Among all the nozzles developed by SEP in the field of Solid Propellants during the last 20 years, the MPS nozzle offers specific characteristics that set the main design choices: • - the need for a very high reliability, in relation with inhabited flights, • - dimensions, leading to the biggest nozzle ever made in Europe. Design is particularly based: • - on a 3 pieces throat assembly made of SEPCARB ® (SEP CARBON/CARBON), from inlet to throat, to insure with maximum reliability both aerodynamic functions and ablation resistance, • - on a flexible bearing with metallic shims, protected by a boot, to fill the purpose of thrust orientation. After a description of the general architecture of the nozzle, this note introduces the developments conducted on a modelisation and experimental approach basis for the justification of the design of these two leading points: the SEPCARB ® three pieces throat assembly and the flexible bearing protection boot.
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