Aerojet has completed over 20 injector tests for the 7,500lb thrust Orion main engine (OME) for Nasa’s Orion crew exploration vehicle.

The tests include checkout, development and qualification to anchor models and satisfy combustion stability qualification requirements.

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The injector has performed well to date, verifying the engine’s combustion stability, and providing chamber wall heat flux and injector performance data to anchor mathematical models.

The OME is a pressure-fed, regeneratively cooled, storable bi-propellant engine – an increased performance version of Aerojet’s 6,000lb thrust space shuttle orbital manoeuvering system engine (OMS-E).

The OME will provide thrust for events requiring large velocity changes such as Earth orbital insertion, translunar / trans-Earth injection, Earth de-orbit and emergency thrust for high-altitude abort scenarios.

Aerojet Orion technical director Sam Wiley said that the testing paved the way for further testing with the regeneratively cooled flight design chamber in 2011.

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Aerojet is developing the engine under contract with Lockheed Martin for Nasa’s Orion crew exploration vehicle.