Blackbird
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B-1/Tu-160 Wing/Body Glove Question

Thu Nov 29, 2007 7:21 pm

How does such a thick wing-body gloves used on the B-1 and Tu-160 manage to not produce large amounts of drag at supersonic speed?

I understand that you can get away with blunt LE's on a supersonic plane if it's swept back enough, but still those are THICK at least from what I remember, particularly the Tu-160...


Andrea Kent
 
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glideslope
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RE: B-1/Tu-160 Wing/Body Glove Question

Thu Nov 29, 2007 8:34 pm

I think all they can do is move the glove design as far outboard in relation to the airframe centerline. Thus reducing the subsonic/transonic drag as much as possible. The rest is four General Electric F-101-GE-102 turbofan engines in re-heat, or 4 HK-32 turbojets.
To know your Enemy, you must become your Enemy.” Sun Tzu
 
N74JW
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RE: B-1/Tu-160 Wing/Body Glove Question

Thu Nov 29, 2007 8:48 pm

At supersonic speed, the aircraft is in front, almost outside of the shock-cone. The wing-tips, and empennage drag the airflow through the slip-stream. Transonic, the airframe has pierced the shock-cone, but has not made it through. Subsonic speeds have the nose of the aircraft hitting the front of the shock-cone, and experiencing the most drag. Airflow spills over the top of the fuselage then waves down the wing-body gloves as it moves aft. I have never seen a B-1 shape in a wind tunnel, but I am quite certain that is how the airflow would move.

My 2c
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Blackbird
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RE: B-1/Tu-160 Wing/Body Glove Question

Fri Nov 30, 2007 9:00 pm

N747JW,

Huh? At supersonic speed, the plane would have the shockwave off the nose, and a shockwave at the tail last I remembered...

Andrea Kent
 
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RE: B-1/Tu-160 Wing/Body Glove Question

Fri Nov 30, 2007 9:21 pm

That's what I remember from class. Supersonic = airplane through the shock-cone, tail in the back.


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This fella is transonic, quickly approaching supersonic.
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Blackbird
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RE: B-1/Tu-160 Wing/Body Glove Question

Sat Dec 01, 2007 4:18 am

Not exactly... as you go transonic the flow accelerates to supersonic speed then slows down forming a shockwave... as the plane goes faster and faster, the supersonic-flow covers more distance forward and aft with the shockwave travelling aft. Once Mach 1 is achieved, the shockwave reaches the tailcone, and a shockwave forms at the nose which is a flat wall shape.

Above Mach 1, the shockwave bends back like a cone at increasingly swept angles as the mach number goes up. Eventually as the shockwave sweeps back far enough, the flow goes subsonic behind the shockwave, and the flow tends to take a bow-shape with the pressure wave detatching from the nose.

Andrea Kent

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