Piston opening

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SpudFiles Forum Index » Pneumatic Cannon Discussion » Piston opening

Piston opening

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squeaks

Posted: 11/26/2006 10:28 AM Post subject: Piston opening

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Joined: 01 Oct 2006
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Can someone explain this to me.
Minimum Required Opening Distance for a Coaxial Piston Valve

Abarrel=pi*r^2
Avalve=2pi*2r*X(open)
Abarrel=Avalve
pi*r^2=4piRX(open)
X(open)=R/4

I understand the area calculation for the barrel, that's just a circle. I don't understand the area for the valve though. What kind of shape is that calculating for? Someone please help.
Thanks

SpudBlaster15

Posted: 11/26/2006 15:56 PM Post subject: Re: Piston opening

Human blast shield
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Joined: 18 Oct 2006
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squeaks wrote:

I don't understand the area for the valve though. What kind of shape is that calculating for?

Look at the formula. Isnt it obvious?

Quote:

Avalve=2pi*2r*X(open)

"Avalve" is the area the valve must uncover when it opens in order for proper flow. The variable that you are calculating, X, is the distance the valve must travel in order to do so.

squeaks

Posted: 11/26/2006 16:28 PM Post subject:

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Joined: 01 Oct 2006
Posts: 329
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No, no no. I'm want to know what shape that is that he is getting the formula from. I know I'm calculating how far the valve is opening.

SpudBlaster15

Posted: 11/26/2006 16:39 PM Post subject:

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Fine, I will be more specific.

"Avalve" is a cylindrical lateral surface area calculation. The X variable is the height of said cylinder, and thus represents the distance the valve is required to move. Keep in mind that lateral surface area is the surface area of an object, minus the top and bottom.

The overall calculation states basic logic. The lateral area uncovered by the valve must equal the area of the barrel opening for full flow.

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