Thats really interesting, and helpful. I know from making planes in simulations it seems like its all about balance and tradeoffs. I couldn't imagine working it out for every situation. It seems like the best you can do is do it the best you can and then just try it out
Hmmm, I wonder if since the recompression shocks and those shear layers seem to sort of bound the wake in, if calculating those angles might help, but the unsteadiness in the wake might effect it too. Looks like I have some research to do
Yeah it seemed like it. I don't think I am going to find it here. And I will be looking on google scholar and stuff. But it doest hurt to ask. I thought there might have been some well known rules like recompression shock angles or pressure differences or something, or mabey it was some well...
I thought I had searched for mach number, apparently I hadnt searched mach number or reynolds numbers effects on it. It seems like subsonically and transsonically mach number and reynolds number increase the length of the recirculation zone, and supersonically and hypersonically decrease the...
How does speed effect the recirculation zone and wake for supersonic and hypersonic speeds? Does it get longer, wider?
Also this is for a blunt body like apollo reentering
That makes sense. I didnt even think of that.
This really cleared up a lot of confusion on it. Thanks for the help with this stuff. Extremely helpful.
Im going to go with this
since I am pretty much sure this is the right way to interpret it now and get the process and stuff. If anyone...
Im just looking for someone to tell me it seems to them like that's what theyre saying in those papers too, or mabey, I think its actually something else. If someone who gets aerodynamics or even modeling well tells me yeah, it seems to them like that's what theyre saying too, then I am pretty...
I mean you actually work in experimental aerodynamics so you understand it way better than me, I want to make sure I am understanding what I am reading right
I found this https://en.wikipedia.org/wiki/Atmospheric_model which I thought talked about using adjustable constants. I also found this https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19870001230.pdf which talks about using a scale factor to adjust it, and I found this...
Also makes sense. So that's how youd do it for building your ship, how would you adjust your model? Say for example you flew it a couple times and in the upper transitions, in the upper atmosphere it was always 30% off. How would you adjust your model?
Another related thing, how do they correct for density differences from the atmosphere model theyre using? I've seen things that say it can be off by as much as 30%, which is huge
Yeah that's true
Needed some time to look into that. Really informative. Looks like the constants are the correction factors and where all the matching to expirements and tuning happens. Heres a NASA paper I saw about using correction factors for lift...
Ive seen the most about corrective factors in ballistics, where for example for artillery at a long range, theyll take the models and predict where it will land, then try it expirementally and see where it actually lands. Then theyll use the info from the expirement to make corrective factors...