1000 degC to -150degC in 0.01s

[kiloran]

http://www.bbc.co.uk/news/science-environment-43732035

That reduction in temperature in such a short time is astonishing (though not dissimilar to a scottish summer to winter transition). Must be true, it's also quoted in Wikipedia

--kiloran

[tjh290633]

Bearing in mind that we are talking of a supersonic environment, the residence time in the heat exchanger cannot be very long. Presumably to get it that low involves slowing the air and exhaust flows down massively to achieve the required heat exchange. At Mach 5 the time in a simple tube can be seen to be miniscule. Let's say that it is 3,600mph, that is 1 mile/second, 0.01 seconds will be 17.6 yards, a bit long for an aero engine.

TJH

[GoSeigen]

Bearing in mind that we are talking of a supersonic environment, the residence time in the heat exchanger cannot be very long. Presumably to get it that low involves slowing the air and exhaust flows down massively to achieve the required heat exchange. At Mach 5 the time in a simple tube can be seen to be miniscule. Let's say that it is 3,600mph, that is 1 mile/second, 0.01 seconds will be 17.6 yards, a bit long for an aero engine.

TJH

LOL, TJH was an aerospace engineer before retirement.



GS