|Quoting LeanOfPeak (Reply 2):|
Do you mean stagnation temperature?
T0 = T [1 + (g+1)/2 M2]
The temperature that would result if the flow were slowed to zero velocity adiabatically?
|Quoting Lehpron (Reply 11):|
Regarding that, say a plane were moving at M5 at 80km (somehow) where the temperature is 165 Kelvin. Accordingly, the stagnation temperature should be 990 Kelvin. But the local density of air is a million times smaller than sea level. How does it get hot with almost no air out there?
Even the space just above the Earth has been measured to have an average of 4K, to the space shuttle, the stagnation average would be 104K @ M25 even when its almost a vacume out there!
|Quoting Newark777 (Reply 3):|
ad·i·a·bat·ic Audio pronunciation of "adiabatically" ( P ) Pronunciation Key (d--btk, d--)
Of, relating to, or being a reversible thermodynamic process that occurs without gain or loss of heat and without a change in entropy.