Ignition system concept for the cryogenic upper stage engine of Ariane 5

Abstract

A trade-oflstucfv for the ignition system of the new cryogenic upper stage engine, originally dubbed MESCO, for Ariane 5 has been performed Out of 23 deferent concepts the trade-off yielded two concepts which potentially ji@ll the special requirements of the new expander cycle engine best. Both concepts were subjected to a comprehensive investigation concerning functional and thrust chamber aspects as well as engine and stage aspects. The high pressure system with separate GOXand GH,-tanks requires less development effort and promises more reliable performance, the low pressure system provides a system with fewer components, has lower mass but possibly impact on engine performance. The final decision by the customers based on the findings of the trade-of is pending.