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Blown compressor tank
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Posted to rec.crafts.metalworking
John Husvar
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Blown compressor tank
In article ,
Ned Simmons wrote:
In article ,
says...
In article oxZcg.1087$No1.766@attbi_s71,
"Dave Lyon" wrote:
What does the assembly weigh and what is the burst pressure? If the
burst pressure is 300 psi and the disk is one inch in diameter, the
thrust at the moment of burst will be (Pi (0.5)^2)(300)= (0.785)(300)=
236 pounds. The impulse (integrated thrust) will be proportional to
tank volume.
Anyway, this thrust is enough to make most compressors move.
Joe Gwinn
Wouldn't that thrust assume you were pushing against a stationary object?
Would it decrease relative to the distance the "hole" was to the floor (or
wall)?
Not quite, the jet stream of pressurized air needs nothing to press
against. Its thrust is independent of anything but the pressure
relationships in the vessel and the nozzle, in this case the tank and
hole. It'd have as much thrust with a vacuum surrounding it. 'tis how
rockets work.
There is a potentially strong surface effect that depends on the
distance to a stationary surface. This surface effect is in addition to
the "rocket" thrust. The rocket thrust is *not* equal to area x
pressure.
I'd think any surface effect would be pretty short-lived, but I'm
certainly _not_ a Rocket Scientist, except sometimes as a hobby when my
kids were younger.
--
Bring back, Oh bring back
Oh, bring back that old continuity.
Bring back, oh, bring back
Oh, bring back Clerk Maxwell to me.
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