Luis María Benítez space memorabilia collection

Artifact: Space Shuttle Main Engine nozzle cooling channels section.
Manufacturer: Rocketdyne.
Dimensions: 7 x 3.2 x 0.6 cm.
Weight: 20 gr.
Program: Space Shuttle
Flown Status: Unflown.

Description:

Section of cooling channels for the Space Shuttle Main Engine nozzle used for testing.

The nozzle is manufactured from 1,080 individual A-286 Stainless Steel coolant tubes. These tubes are thinwalled and roughly 1/4" (0.63 cm) in diameter brazed together and to the structural jacket.

The fuel is supplied to the nozzle from the high-pressure fuel turbopump at 6,000 psi. It enters the nozzle from the diffuser and is then routed through the downcomer lines into the aft manifold. The fuel is routed upwards in a single pass through the nozzle tubes to cool the inner wall of the nozzle increasing in temperature by 400°F (204°C) in ahout two milliseconds. The hydrogen collects in the forward manifold then onto the mixer bowl to combine with the bypass flow from the coolant control valve.

Space Shuttle Main Engine. The cooling tubes are visible on the interior wall of the nozzle. Credit: National Air and Space Museum - Smithsonian Institution.

Liquid Hydrogen at -423 °F (-252° C) was used during chill-down and was the propellant for the Space Shuttle Main Engines (SSME) on the Shuttle Orbiter.

The Aerojet Rocketdyne RS-25, also known as the SSME, is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle and is currently used on the Space Launch System (SLS).