Aerodynamic heating - Revision history

rana at 22:36, 7 December 2019

2019-12-07T22:36:11Z

← Older revision		Revision as of 22:36, 7 December 2019
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	This typically is were a wing meets the body. <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.		The interaction of the two shock waves can super heat the air mass in a local area.

			===Practical Applications===
			We can go in to the calculations for deriving the Total Air Temperature (TAT). TAT =SAT (static air temp) + Ram Air temperature.
			If you want to see the formulas to get to TAT please see. https://en.wikipedia.org/wiki/Total_air_temperature

			For all practical purposes you want to stay under the following speeds at the following altitudes.
			{\| class="wikitable"
			\|-
			! Km/Sec !! KM Altitude !!
			\|-
			\| 0.25 \|\| 25 \|\|
			\|-
			\| 0.75 \|\| 40 \|\|
			\|-
			\| 1.5 \|\| 60 \|\|
			\|-
			\| 2.5 \|\| 80 \|\|
			\|-
			\| Orbital \|\| >100 \|\|
			\|}



			As density decreases the the effect of the ram air on the airframe decreases. <br>
			==== How to picture this. ====
			<br>
			Imagine you have 10 cups of boiling water. You pour all 10 right over your airframe. The entire wing get scalding hot. <br>
			Now you climbed to 6 Km altitude. You are at half the density. So you are only pouring 5 cups of boiling water on the wing. It get warm but not dangerous to your hand. <br>
			You continuing climbing. As you pass 20 km the density is down so low that you only have 2 ½ cups of water. <br>
			As you keep climbing yes the TAT is going astronomically high but the mass of the air is decreasing. Once you are over 100 Km you if you are at orbital speeds you are for all practical purposes you are exposing the skin to temperatures that would melt metal but the mass of the action is so low it has almost no effect.

reskin at 14:30, 7 December 2019

2019-12-07T14:30:06Z

← Older revision		Revision as of 14:30, 7 December 2019
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	~~==Aerodynamic Heating==~~
	[[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.

reskin at 13:32, 2 January 2008

2008-01-02T13:32:08Z

← Older revision		Revision as of 13:32, 2 January 2008
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	==Aerodynamic Heating==		==Aerodynamic Heating==
	[[Drag]] causes friction~~<br>~~		[[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.
	~~Friction~~ causes ~~heat~~.~~<br>~~
	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]]~~.<br>~~		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]].
	~~Since each molecule has [[kg\|Mass]]. The molecules resist moving. This friction causes heating~~.

rana: /* Aerodynamic Heating */

2007-08-28T22:24:34Z

Aerodynamic Heating

← Older revision		Revision as of 22:24, 28 August 2007
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	==Aerodynamic Heating==		==Aerodynamic Heating==
			[[Drag]] causes friction<br>
	Friction causes heat.<br>		Friction causes heat.<br>
	~~[[Drag]] causes friction<br>~~
	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]].<br>		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]].<br>
	Since each molecule has [[kg\|Mass]]. The molecules resist moving. This friction causes heating.		Since each molecule has [[kg\|Mass]]. The molecules resist moving. This friction causes heating.

rana at 22:23, 28 August 2007

2007-08-28T22:23:58Z

@@ Line 1: / Line 1: @@
-==Drag in flight==
+==Aerodynamic Heating==
-There are 4 forces acting on an aerospace vehicle in flight.
+Friction causes heat.<br>
-#[[Thrust]]
+[[Drag]] causes friction<br>
-#Drag
+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]].<br>
-#[[Lift]]
+Since each molecule has [[kg|Mass]]. The molecules resist moving. This friction causes heating.

rana: /* =Drag as action */

2007-08-28T22:07:59Z

=Drag as action

← Older revision		Revision as of 22:07, 28 August 2007
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	The act of moving an object over or through another is called dragging.		The act of moving an object over or through another is called dragging.
	Dragging two objects over or through each other causes friction were the 2 meet.		Dragging two objects over or through each other causes friction were the 2 meet.
	At very high speeds this may lead to[[Aerodynamic_heating\| Aerodynamic heating]].		<br>At very high speeds this may lead to[[Aerodynamic_heating\| Aerodynamic heating]].

	Examples:		Examples:
	I am dragging the bag on the ground.		<br> I am dragging the bag on the ground.
	The anchor is dragging in the water.		<br>The anchor is dragging in the water.

rana: New page: ==Drag in flight== There are 4 forces acting on an aerospace vehicle in flight. #Thrust #Drag #Lift #Mass image:4forces.jpg *An aircraft will accelerate as long as th...

2007-08-28T22:05:44Z

New page: ==Drag in flight== There are 4 forces acting on an aerospace vehicle in flight. #Thrust #Drag #Lift #Mass image:4forces.jpg *An aircraft will accelerate as long as th...

New page

==Drag in flight==
There are 4 forces acting on an aerospace vehicle in flight.
#[[Thrust]]
#Drag
#[[Lift]]
#[[Kg|Mass]]
[[image:4forces.jpg]]

*An aircraft will accelerate as long as the [[Thrust]] is greater then the drag.
*The aircraft stay the same [[IAS|indicated air speed]] when [[Thrust]] and drag are equal.
*The aircraft will slow down when drag is greater then [[Thrust]].

===Drag as action==
The act of moving an object over or through another is called dragging.
Dragging two objects over or through each other causes friction were the 2 meet.
At very high speeds this may lead to[[Aerodynamic_heating| Aerodynamic heating]].

Examples:
I am dragging the bag on the ground.
The anchor is dragging in the water.