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Total air temperature
Total air temperature is a term used generally in aviation. It is measured by a specially designed temperature probe mounted on the surface of the aircraft. The probe is designed to bring the air to rest relative to the aircraft. As the air is brought to rest kinetic energy is converted to internal energy. The air is compressed and experiences an adiabatic increase in temperature. Therefore total air temperature is higher than the static (or ambient) air temperature.
Additional recommended knowledge
Total air temperature is an essential input to an air data computer in order to enable computation of static air temperature and hence true airspeed.
The relationship between static and total air temperatures is given by:
T0 = static air temperature (kelvin or degree Rankine)
e = recovery factor (also noted Ct)
Platinum wire ratiometer thermometer ("flush bulb type"): e ≈ 0.75 - 0.9
Double platinum tube ratiometer thermometer ("TAT probe"): e ≈ 1
Total air temperature (TAT) is also called: indicated air temperature (IAT) or ram air temperature (RAT)
The difference between TAT & SAT is called ram rise (RR)
In practice the ram rise is negligible for aircraft flying at (true) airspeeds under Mach 0.2
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Total_air_temperature". A list of authors is available in Wikipedia.|