- #1
addzkebabs
- 2
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Hey guys! I'm new to the forums here and was after some help for something that I am currently working on. I need help converting cfm to thrust, i have found the formula though i can't get my head around it.
Here it is:
CFM = Cubic Feet per Minute = Volumetric Flow Rate
Mass Flow Rate = (Density) x (Volumetric Flow Rate)
Newton’s Second Law of Motion: Force = (Mass) x (Acceleration), or F = ma
F = ma = (Mass Flow Rate) x (Velocity), given a constant flow velocity
(i.e., constant propeller speed and pitch angle).
Velocity = (Volumetric Flow Rate) / (Area), where Area = (Pi) x (r^2), the
length of a propeller blade is a good approximation for the radius, r.
Thrust = (Density) x (CFM^2) / ((Pi) x (r^2))
The amount of cfm i need to convert is 2750cfm. Any pointers?
Cheers, Addz.
Here it is:
CFM = Cubic Feet per Minute = Volumetric Flow Rate
Mass Flow Rate = (Density) x (Volumetric Flow Rate)
Newton’s Second Law of Motion: Force = (Mass) x (Acceleration), or F = ma
F = ma = (Mass Flow Rate) x (Velocity), given a constant flow velocity
(i.e., constant propeller speed and pitch angle).
Velocity = (Volumetric Flow Rate) / (Area), where Area = (Pi) x (r^2), the
length of a propeller blade is a good approximation for the radius, r.
Thrust = (Density) x (CFM^2) / ((Pi) x (r^2))
The amount of cfm i need to convert is 2750cfm. Any pointers?
Cheers, Addz.