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The J-2, commonly known as Rocketdyne J-2, was a liquid-fuel cryogenic rocket engine used on NASA's Saturn IB and Saturn V launch vehicles. Built in the United States by Rocketdyne, the J-2 burned cryogenic liquid hydrogen (LH 2) and liquid oxygen (LOX) propellants, with each engine producing 1,033.1 kN (232,250 lb f) of thrust in vacuum.
Pogo oscillation is a self-excited vibration in liquid-propellant rocket engines caused by combustion instability. [1] The unstable combustion results in variations of engine thrust, causing variations of acceleration on the vehicle's flexible structure, which in turn cause variations in propellant pressure and flow rate, closing the self-excitation cycle.
Giant valves 20 feet in diameter supplied air from one supersonic leg to another. 1955 The ... Apollo Training Facilities (4) Apollo Hardware Test Facility (1)
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In 2006 ABB was awarded a contract to replace the thyristor valves at the Apollo station. [4] The outdoor mounting concept was retained, but each of the new housings contains a complete six-pulse bridge instead of only two valves, and the replacement thyristor valves are of a more conventional air insulated, water-cooled design using 125mm, 8.5 ...
Soon after the Apollo 6 flight, NASA and its contractors sought to eliminate the problems for future flights, and about 1,000 government and industry engineers worked on the problem. To damp pressure oscillations in the F-1 and J-2 engines, cavities in valves leading to them were filled with helium gas shortly before takeoff as a shock absorber ...
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