Inspection of the Vacuum Chamber Dome at the Space Power Chambers

Engineers at the National Aeronautics and Space Administration (NASA) Lewis Research Center inspect the nitrogen baffle in the interior of the 22.5-foot diameter dome at the Space Power Chambers. In 1961 NASA Lewis management decided to convert the Altitude Wind Tunnel into two large test chambers and renamed the facility the Space Power Chambers. The conversion, which took over two years, included removing the tunnel’s drive fan, exhaust scoop, and turning vanes from the east end and inserting bulkheads to seal off the new chambers within the tunnel. The eastern section of the tunnel became a vacuum chamber capable of simulating 100 miles altitude. In 1962 NASA management decided to use the new vacuum chamber exclusively to study the second-stage rocket. This required significant modifications to the new tank and extensive test equipment to create a space environment. The Lewis test engineers sought to subject the Centaur to long durations in conditions that would replicate those encountered during its missions in space. The chamber was already capable of creating the vacuum of space, but the test engineers also wanted to simulate the cryogenic temperatures and solar radiation found in space. Six panels of 500-watt tungsten-iodine lamps were arranged around the Centaur to simulate the effect of the Sun’s heat. A large copper cold wall with its interior coated with heat-absorbing black paint was created specifically for these tests and assembled around the Centaur. The 42-foot-high wall had vertical ribs filled with liquid nitrogen which produced the low temperatures.