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Killer Shots

MIDNJAC

MIDNJAC

is clara ship
pilot
tiger84 said:
Yeah, it does depend on the shape of the object. Most of the basic theoretical stuff deals with a shockwave forming at the apex of a wedge, so varying the angle of the wedge will change the angle of the shockwave. There's a decent flash based shockwave simulator that NASA put together as part of their idiot's guide to all things aerospace, but I can't find the exact page. This page has a decent explanation of oblique shockwave properties.

Edit: the simulator is about halfway down the page I linked to.

/nerd talk
Click to expand...

Right, so I was just wondering if the fact that only the local flow was supersonic (or transitional) makes this theory incorrect like the guy was claiming? I thought it was more a function of shape, rather than freestream velocity. And my god....I cant believe I just typed that. Seriously..../nerd stuff......:)
 
tiger84

tiger84

LT
pilot
MIDNJAC said:
Right, so I was just wondering if the fact that only the local flow was supersonic (or transitional) makes this theory incorrect like the guy was claiming? I thought it was more a function of shape, rather than freestream velocity. And my god....I cant believe I just typed that. Seriously..../nerd stuff......:)
Click to expand...

All it takes is for some of the flow to be supersonic, hence the localized shockwaves in the pic, so as far as I know the theory should still apply. M<1 gives you no shock, M=1 gives you a normal shock, and M>1 gives you an oblique shock, notwithstanding the discussion of bow shocks and the like. I haven't thought about this crap in a year or more though, so I'm definitely not an expert.
 
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