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Constant Area Pneumatic Orifice (ISO 6358)<br />

Constant Area Pneumatic Orifice (ISO 6358)<br />

Fixed-area pneumatic orifice complying with ISO 6358 standard<br />

Library<br />

Pneumatic Elements<br />

Description<br />

The Constant Area Pneumatic Orifice (ISO 6358) block models the flow rate of an ideal<br />

gas through a fixed-area sharp-edged orifice. The model conforms to the ISO 6358<br />

standard and is based on the following flow equations, originally proposed by Sanville [1]:<br />

Ï Ê po<br />

ˆ ref<br />

k p<br />

p<br />

TT sign p p p<br />

Ô<br />

o<br />

1i i Á1<br />

- ˜ i ( i - o) if > b lam (laminar)<br />

Ô Ë i ¯ i<br />

pi<br />

Ô<br />

Ô<br />

Ô<br />

Ô<br />

G = Ì piiCir<br />

ref<br />

Tref<br />

i<br />

Ti<br />

2<br />

Ê po<br />

ˆ<br />

Á - b<br />

p<br />

˜<br />

1 - Á i ˜<br />

Á 1 - b ˜<br />

Á ˜<br />

Ë ¯<br />

p<br />

if blam<br />

> o > b ( subsonic)<br />

pi<br />

Ô<br />

Ô<br />

Ô<br />

Ô Tref<br />

p<br />

pi<br />

C ref<br />

if o<br />

Ô i ir

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