| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
25 Nov 2005 12:12:19 AM |
| Object: |
fluid dynamics question |
I am trying to calculate the air flow and pressure required to sustain
a theoretical (for now) hovercraft (i.e. how much escapses from under
the "skirt" at a given pressure). to make the math easy: If a combined
mass of 100kg is to be lifted, and the (square) deck has a surface area
of, say, 100 cm^2....obviously 1kg/cm^2 (above ambient pressure) keeps
it up.
the question is....
given that pressure, and a required "ride height" of 1 cm....what
forumlas would i use to find the rate of flow?
any help appreciated, thanks in advance
peace
elliot
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| User: "Rene Tschaggelar" |
|
| Title: Re: fluid dynamics question |
26 Nov 2005 04:04:56 PM |
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wrote:
I am trying to calculate the air flow and pressure required to sustain
a theoretical (for now) hovercraft (i.e. how much escapses from under
the "skirt" at a given pressure). to make the math easy: If a combined
mass of 100kg is to be lifted, and the (square) deck has a surface area
of, say, 100 cm^2....obviously 1kg/cm^2 (above ambient pressure) keeps
it up.
the question is....
given that pressure, and a required "ride height" of 1 cm....what
forumlas would i use to find the rate of flow?
The air is escaping from below the skirt. You have to model
this flow. For simplicity, assume flat hard ground instead
of water. Also for simplicity, assume the skirt to be a hard
round tube without any deformation, nor elasticity. And another
one to simplify : the escaping air might create forces to the
craft, which could make the craft rock back and forth. Omit
these forces. To start with just model the air escape as function
of the height
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
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