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cf-convention / vocabularies

Issues and source files for CF controlled vocabularies
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Standard names: stagnation_temperature_in_air #167

Closed damienboulanger closed 1 year ago

damienboulanger commented 3 years ago

Proposer's name: Damien Boulanger Date: 2021-10-01

Term: stagnation_temperature_in_air Unit: K Description: In thermodynamics and fluid mechanics, stagnation temperature is the temperature at a stagnation point in a fluid flow. At a stagnation point the speed of the fluid is zero and all of the kinetic energy has been converted to internal energy and is added to the local static enthalpy. In both compressible and incompressible fluid flow, the stagnation temperature is equal to the total temperature at all points on the streamline leading to the stagnation point. In aviation, stagnation temperature in air is known as total air temperature and is measured by a 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. 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.

JonathanGregory commented 3 years ago

Dear @damienboulanger

Thanks for the proposal. It makes sense to me (not being an expert)! I think the standard name should have _in_air appended to it.

Best wishes

Jonathan

damienboulanger commented 2 years ago

Sorry for the late answer. Thank you for your comment. I think you're right. I've added the "_in_air" in the name

damienboulanger commented 2 years ago

Hello I didn't get any more comment. Do you accept my proposal? Best regards

feggleton commented 2 years ago

Hi @damienboulanger, apologies for the delay in getting back to you. I think this term and definition is probably fine. I don't think there are any regularly used phrases which should be used here. I will allow @japamment to comment. If no further comment then these can be accepted in the next 7 days.

feggleton commented 1 year ago

These terms were added to the Standard Name Table Version 80 on the 7th of Feb 2023.