tdscanuck
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So, What Does Mach 6 Flow Really Look Like?

Thu Feb 12, 2009 6:24 am

I couldn't think of where else to post this, so I figure it will be appreciated here.

A picture of what a Mach 6 scramjet inlet looks like when it unstarts:
http://adl.stanford.edu/files/MachUnsteady.mov

What we're looking at is a slice through a Mach 6 flow from left to right. The large white blob on the bottom is the top half of the vehicle body (the bottom half is below the video, but it's symmetric). The little white slice coming in from the right is the other part of the inlet (the "ring" part you see when you look at supersonic inlets). The giant purple line from lower left to upper right is the shockwave coming off the nose of the vehicle.

It's running nicely, then they close the throat a little bit and *wham*...unstart.

Not sure how much folks care about the underlying physics, but it makes for a darn pretty video.

Tom.
 
LY744
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RE: So, What Does Mach 6 Flow Really Look Like?

Thu Feb 12, 2009 3:06 pm

Colourful Fluid Dynamics for the win!  Wink


LY744.
Pacifism only works if EVERYBODY practices it
 
SNAFlyboy
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Joined: Thu Oct 18, 2007 5:42 pm

RE: So, What Does Mach 6 Flow Really Look Like?

Thu Feb 12, 2009 9:04 pm

Man, that's awesome. Gotta love Aero Engineering. Big grin

Thanks for sharing, Tds!

~SNAFlyboy
 
JoeCanuck
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RE: So, What Does Mach 6 Flow Really Look Like?

Thu Feb 12, 2009 11:51 pm

Nifty...though it would be nice to have a bit more of the steady state flow before they close the throat so we could better see the transition.
What the...?
 
soon7x7
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RE: So, What Does Mach 6 Flow Really Look Like?

Fri Feb 13, 2009 2:50 am



Quoting Tdscanuck (Thread starter):

Where do you get this stuff?...j
 
tdscanuck
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Joined: Wed Jan 11, 2006 7:25 am

RE: So, What Does Mach 6 Flow Really Look Like?

Fri Feb 13, 2009 6:29 am



Quoting JoeCanuck (Reply 3):
Nifty...though it would be nice to have a bit more of the steady state flow before they close the throat so we could better see the transition.

It probably depends on your browser and Quicktime version but, on mine, I can grab the video slider with my mouse and drag it back and forth to slow down/speed up/pause at the interesting times.

Here's the initial frame:
http://img230.imageshack.us/img230/3097/initialconditionm6ig8.jpg

Quoting Soon7x7 (Reply 4):
Where do you get this stuff?

I'm about 3/4 of the way through my masters in aero engineering (working at it part time). This week happened to be hypersonics, and the guys who did the CFD behind this video are collegues of my propulsion prof.

Tom.
 
FredT
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RE: So, What Does Mach 6 Flow Really Look Like?

Fri Feb 13, 2009 9:08 am

Ouch!

Very interesting to watch, thanks for posting this nugget! If you happen to come acryss any more, you know where to send'em!  Smile
I thought I was doing good trying to avoid those airport hotels... and look at me now.
 
soon7x7
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RE: So, What Does Mach 6 Flow Really Look Like?

Fri Feb 13, 2009 3:06 pm



Quoting Tdscanuck (Reply 5):

It's a great field...good luck...j  bigthumbsup 
 
JoeCanuck
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Joined: Mon Dec 19, 2005 3:30 am

RE: So, What Does Mach 6 Flow Really Look Like?

Sat Feb 14, 2009 8:14 pm



Quoting Tdscanuck (Reply 5):

I just had to let it cycle through a few times since it changes playback speed. Interesting stuff...good luck with it.
What the...?
 
JoeCanuck
Posts: 3939
Joined: Mon Dec 19, 2005 3:30 am

RE: So, What Does Mach 6 Flow Really Look Like?

Sat Feb 14, 2009 11:15 pm

It's interesting how far away from the body the flow is deflected and slowed after being separated by the duct...and the huge external effects of the unstart.
What the...?
 
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DocLightning
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RE: So, What Does Mach 6 Flow Really Look Like?

Mon Feb 16, 2009 2:26 am

stanford.edu

My alma mater!  thumbsup 

And a very cool animation.
-Doc Lightning-

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