Prometheus development accelerates with new contract from ESA

(17 May 2021) The European Space Agency (ESA) has awarded ArianeGroup a new €135 million contract to continue the development of a set of reusable, very low cost Prometheus engine demonstrators.

Building on the results already achieved, the purpose of this new contract is to finalise the demonstration phase with hot-fire tests of the first two prototypes on the DLR site in Lampoldshausen, Germany, and to design an improved version of the engine, capable of delivering a thrust of 120 metric tons, compared with the current 100 tons, as well as a liquid hydrogen version.

Initially designed to run on a mixture of methane and liquid oxygen, the liquid hydrogen-oxygen version of Prometheus could be used as early as 2025 on an Ariane 6 upgrade. The contract also calls for the production of a pre-series of engines to begin the pre-industrialisation phase, while continuing to test new series production processes. This will enable Prometheus to meet the needs of all applications and all missions.

These will be the first European engines with controlled combustion, enabling them to adapt to launcher flight conditions during the various phases of the mission. A digital system will provide control over a range from 30 to 100% maximum thrust. Prometheus will also be equipped with Artificial Intelligence and a Health Monitoring system that will enable a diagnostic of the engine's operation at any time.

The Prometheus demonstrators will benefit from the latest additive manufacturing technologies, with the parts produced in this way accounting for 70% of the total mass of the engine, including the combustion chamber, which is entirely built using 3D printing at the ArianeGroup site in Ottobrunn, Germany.

Prometheus was initiated in 2015 with the French space agency CNES and covered by an ESA contract since 2017. Its production costs in the 100-ton thrust class will be 10 times lower than that of the current Vulcain 2 engine for Ariane 5.

A version of Prometheus can also be fitted to equip the Themis reusable stage demonstrator.

Reference: ArianeGroup PR

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