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nickvdm
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If i have an air tank with a volume of one cubic meter, that is compressed to 200psi, with an outlet pipe of 10mm, that is regulated to 30psi. How do i calculate the force at the outlet of the pipe. I intend to vary these factors, so feel free to change them if you need too.
So far i have
F = MA = (mass flow rate) x (velocity) given a constant flow of velocity
Mass flow rate = (density) x (volumetric flow rate)
Velocity = (volumetric flow rate/ Area)
Volumetric flow rate = CFM (cubic feet/ min)
How are the factors above applied to the equations, and do i need to take into account tempreture of the air.
I am trying to establish the torque from a fan motor
Torque = force (?) x distance from centre.
I am i heading in the right direction... I got this informatiom from another website, but it was being applied to a fan on a hovercraft forcing air through a cowling.
Secondly i would like to work out how long i can maintain this force before the pressure drops below the regulator.
Any help would be appreciated
Nick
From the feed back i have received so far i feel i should clear a few things up
Firstly when i refer to a fan motor, I am talking about a rotary vane motor, air motor...
basically a rotary fan motor, driven by compressed air.
Not a domestic fan that blows air at you.
So what I am looking for is how to calculate the force being exerted upon the blade of the fan.
Example...( this is an example only and not what I am trying to do... but its close)
If i rip the internal combustion motor out of my car and replace it with a compressed air motor,
what size motor and what pressure would i need to make the car operate at its current efficiency.
I already know the horse power, and Rpm necesarry (from the existing motor),
and from there i can calculate the torque required from the compressed air motor.
From there i can also calculate the force required,but i can't calculate the force that the air will give me...
My plan is to test this theory, with a scale model but I am trying to do the maths and physics first
due to the cost of equiptment necessary to do this ( compressor, air motor,ect, ect)
So far i have
F = MA = (mass flow rate) x (velocity) given a constant flow of velocity
Mass flow rate = (density) x (volumetric flow rate)
Velocity = (volumetric flow rate/ Area)
Volumetric flow rate = CFM (cubic feet/ min)
How are the factors above applied to the equations, and do i need to take into account tempreture of the air.
I am trying to establish the torque from a fan motor
Torque = force (?) x distance from centre.
I am i heading in the right direction... I got this informatiom from another website, but it was being applied to a fan on a hovercraft forcing air through a cowling.
Secondly i would like to work out how long i can maintain this force before the pressure drops below the regulator.
Any help would be appreciated
Nick
From the feed back i have received so far i feel i should clear a few things up
Firstly when i refer to a fan motor, I am talking about a rotary vane motor, air motor...
basically a rotary fan motor, driven by compressed air.
Not a domestic fan that blows air at you.
So what I am looking for is how to calculate the force being exerted upon the blade of the fan.
Example...( this is an example only and not what I am trying to do... but its close)
If i rip the internal combustion motor out of my car and replace it with a compressed air motor,
what size motor and what pressure would i need to make the car operate at its current efficiency.
I already know the horse power, and Rpm necesarry (from the existing motor),
and from there i can calculate the torque required from the compressed air motor.
From there i can also calculate the force required,but i can't calculate the force that the air will give me...
My plan is to test this theory, with a scale model but I am trying to do the maths and physics first
due to the cost of equiptment necessary to do this ( compressor, air motor,ect, ect)
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