7 ms·
Wow. 1,500C to -150C in 1/100th of a second sounds pretty remarkable. Any idea how that's achieved?
by EngineerBetter 8y ago
Wow. 1,500C to -150C in 1/100th of a second sounds pretty remarkable. Any idea how that's achieved?
- baybal2 8y agoThere was a movie showing their heat exchanger test going around. It is a gas to gas (helium.) And you can pump helium at very high flow rates. Speed of sound in helium is 1000m/s after all.
- NeedMoreTea 8y agoA helium cooling loop, cooled by a nitrogen boiler. More info and pictures: https://www.bbc.co.uk/news/science-environment-20510112 https://www.bbc.co.uk/news/science-environment-20510112 The Rolls engines designed for HOTOL were meant to do the same, by a different method. They were going to use the hydrogen fuel to operate the intake heat exchangers. The engine then burnt hot hydrogen. Any excess was used as reheat injected into the exhaust.
- scotty79 8y agoWhat do they ultimately do with the heat? Or do they just boil of the nitrogen into the atmosphere and need to take a supply of it for the whole trip?