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Pressure change and area ratio help

by sokolomi
Tags: pressure, ratio
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sokolomi
#1
Mar22-08, 11:51 AM
P: 2
so if you put about 120 psi in a container and then instanly release it into another with something blocking the way, how fast would that escape, what are the variables in this
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russ_watters
#2
Mar22-08, 01:05 PM
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Size of the containers and size of the orifice.
sokolomi
#3
Mar22-08, 04:49 PM
P: 2
do guys know any good barrel to air container ratios or anything i should know befor i go building a spud gun cuz i want maximum velocity out of it with like 120 psi

FredGarvin
#4
Mar23-08, 12:01 PM
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Pressure change and area ratio help

Unless you can make a C-D nozzle, you'll probably end up choking the valve on the tank and that will set your max velocity.
russ_watters
#5
Mar25-08, 09:07 PM
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I forgot about choked flow, but in any case, a C-D nozzle still involves choked flow...(i know you know that). If he only cares about mass flow, getting a supersonic airstream doesn't actually do anything for him.


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