Aestus
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The Aestus engine is the main engine of the upper stage EPS-L9.7 and the resulting 250 kg more fuel EPS-L10 (EPS stands for French Étage à Propergols stockables ) of the Ariane 5 G, G +, GS and ES ATV rockets .
The Aestus engine uses the storable fuel mixture of the oxidizer dinitrogen tetroxide (NTO) and the fuel monomethylhydrazine (MMH), has 28.4 kN thrust and a specific impulse of 3178 Ns / kg. It was developed by EADS in Ottobrunn from 1988 to 1995 . The pressure-boosted engine enables several re-ignitions.
In order to protect the combustion chamber from the reaction products at a temperature of 3000 ° C, the MMH fuel flows from bottom to top through thin tubes in the combustion chamber wall before it is injected into the combustion chamber from above. However, the thrust nozzle is not actively cooled, but heats up to the point of red heat and emits just as much energy through radiation to the outside as it absorbs from the inside from the thrust jet.
The engine was first used on October 30, 1997 on flight 502 of Ariane 5.
| parameter | value |
|---|---|
| Fuels | NTO / MMH |
| Thrust in vacuum | 28.4 kN |
| power | 43,700 kW |
| Specific impulse (vacuum) | 3178 Ns / kg (324 s) |
| Fuel throughput | 8.8 kg / s |
| Combustion chamber pressure | 11 bar |
| Aspect ratio | 84 |
| overall length | 2.2 m |
| Nozzle diameter | 1.32 m |
| Dimensions | 111 kg |
Others
From the Aestus, together with Boeing Rocketdyne, the test engine Aestus II / RS 72 with turbo pumps from the USA with almost double the thrust was developed. It was successfully tested in 2000 but has not yet been used in any missile.
supporting documents
- EADS: Aestus Rocket Engine
- ↑ CNES : Ariane 5
- ↑ Bernd Leitenberger: The Ariane 5
- ↑ Boeing: Rocketdyne / Astrium RS-72 Engine Testing Successfully Completed ( Memento of November 6, 2011 in the Internet Archive )