Air Friction Heat

[Joss]

I'm working on the math to calculate heat conservative re-entry profiles and worked out a few numbers so I went and checked them out in the DG-IV and the XR-1 and to my surprise none of them worked on my numbers, not only that but they dont agree to each other either.. :blink:

So.. As I uderstand each developer is using his own guessed factor
for temperature to Martin's equation P=1/2pv3 mainly based on playability rather than realism, so my question is: Has anoyone worked out accurate math for T in atmospheric re-entry?

If none.. Should we consider stablishing a consensed value so any developer can adopt it?


This way once an orbinaut has mastered re-entry on one ship his/her experience wil mostly make sense on ahy other ship.

 

[Urwumpe]

So.. As I uderstand each developer is using his own guessed factor
for temperature to Martin's equation P=1/2pv3 mainly based on playability rather than realism, so my question is: Has anoyone worked out accurate math for T in atmospheric re-entry?

1. It is the realistic function for the average aerodynamic heat flux. It does not return temperature, but a heat flux in W/m².
2. Temperature is calculated by calculating the balance of all heat fluxes.

The realistic function for that includes also current hull temperature, material constants, local airflow, etc. For fictional spacecraft, this can be guesstimated, for realistic, there are papers with these factors.

 

[Pilot7893]

:huh:Not even I'm THAT good with big words:huh:
:crazy::crazy::crazy::crazy::crazy::crazy::crazy:see my confusion?

 

[ar81]

Temperature depends on vessel shape and direction of motion relative to vessel axis if I am correct. Some regions of the vessel will suffer higher temperature than others.

 

[V8Li]

I've been there too, I wanted to add an option to display the temperature in my HUDdataMFD (@ orbithangar). I don't think you'd get the same exact results... I haven't checked their formulas but my guess is that they (devs) have used constants (multipliers) for different parts of the vessel, the bank angle must get a part in that too (ie to simulate different exposures)... you got the point, it's complex and "personal". For an MFD it would be hard since the users will get different values than the ones from the vessels, if you're building a vessel you're gonna have to come up with yours. Like I've mentioned, I don't think they have used fixed formulas.

Do let us know if you come up with something...

 

[perseus]

Hello all,
As if that is what you are looking