Aerodynamic heating: Difference between revisions
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[[Drag]] causes friction and that friction causes heating. It is a result of the [http://en.wikipedia.org/wiki/Kilogram mass] resisting a change in velocity. | [[Drag]] causes friction and that friction causes heating. It is a result of the [http://en.wikipedia.org/wiki/Kilogram mass] resisting a change in velocity. | ||
At very high altitudes and very high speeds the individual molecules in the [[atmosphere]] need to be pushed out of the way of an object [[Reentry|reentering]]. | At very high altitudes and very high speeds the individual molecules in the [[atmosphere]] need to be pushed out of the way of an object [[Reentry|reentering]]. | ||
Reentry can be a very dangerous time, because you are impacting the air at a high speed, and there is not enough to help cool the ship. | |||
===Outside Air Temperature=== | |||
Outside Air Temperature is displayed as OAT.<br /> | |||
This is the air temp taken in Kevin. <br /> | |||
<br /> | |||
===Static Air Temperature=== | |||
Static Air Temperature is displayed as SAT.<br /> | |||
This is the air temp taken with a standard thermometer in still air and no sun shining on it. <br /> | |||
*For the purpose practicality OAT(in K) and SAT(in C) are basically the same just different scales.<br /> | |||
<br /> | |||
===Ram Air Temperature=== | |||
Often called Ram Air or RAT<br /> | |||
This is a measure of how much the compression of the air is heating it. SAT+RAT= TAT<br /> | |||
<br /> | |||
===Total Air Temperature=== | |||
Total Air Temperature is what you track to see how much the Air will heat your Air Frame<br /> | |||
The lower the Dynamic Pressure and Air pressure the less TAT can affect you. <br /> | |||
In space you may only be impacting a few molecules a second with the entire air frame. <br /> | |||
Yes each molecule imparts energy but there are so few that you can still cool through radiation. <br /> | |||
<br /> | |||
===Air Frame Temperature=== | |||
You will find this listed as AFT on most displays. <br /> | |||
This is usually a direct reading of the most critical part of the ship.<br /> | |||
This typically is were a wing meets the body. <br /> | |||
The interaction of the two shock waves can super heat the air mass in a local area. | |||
Revision as of 14:30, 7 December 2019
Drag causes friction and that friction causes heating. It is a result of the mass resisting a change in velocity.
At very high altitudes and very high speeds the individual molecules in the atmosphere need to be pushed out of the way of an object reentering.
Reentry can be a very dangerous time, because you are impacting the air at a high speed, and there is not enough to help cool the ship.
Outside Air Temperature
Outside Air Temperature is displayed as OAT.
This is the air temp taken in Kevin.
Static Air Temperature
Static Air Temperature is displayed as SAT.
This is the air temp taken with a standard thermometer in still air and no sun shining on it.
- For the purpose practicality OAT(in K) and SAT(in C) are basically the same just different scales.
Ram Air Temperature
Often called Ram Air or RAT
This is a measure of how much the compression of the air is heating it. SAT+RAT= TAT
Total Air Temperature
Total Air Temperature is what you track to see how much the Air will heat your Air Frame
The lower the Dynamic Pressure and Air pressure the less TAT can affect you.
In space you may only be impacting a few molecules a second with the entire air frame.
Yes each molecule imparts energy but there are so few that you can still cool through radiation.
Air Frame Temperature
You will find this listed as AFT on most displays.
This is usually a direct reading of the most critical part of the ship.
This typically is were a wing meets the body.
The interaction of the two shock waves can super heat the air mass in a local area.