How Do You Calculate Air Velocity from a Nozzle?

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SUMMARY

The calculation of air velocity from a nozzle can be achieved using the ideal gas equation and the continuity equation. Specifically, the equations P1 * V1 = P2 * V2 and Q = A * V are essential for determining velocity based on pressure and nozzle diameter. Additionally, considerations of mass flow rate, turbulence, and compressibility are crucial, as highlighted by the discussion on Free Air Delivery (FAD) and the limitations of using a pitot tube for speed measurement. For precise calculations, referencing ISO 1217 for air compressor measurements is recommended.

PREREQUISITES
  • Understanding of the ideal gas equation
  • Familiarity with the continuity equation in fluid dynamics
  • Knowledge of mass flow rate concepts, specifically Free Air Delivery (FAD)
  • Awareness of turbulence and compressibility effects in fluid flow
NEXT STEPS
  • Study the ideal gas law and its applications in fluid dynamics
  • Research the continuity equation and its relevance to nozzle flow calculations
  • Examine ISO 1217 for standards on air compressor performance measurements
  • Explore analytical solutions for axisymmetric jets in fluid mechanics
USEFUL FOR

Engineers, physicists, and anyone involved in fluid dynamics or air flow measurement, particularly those working with nozzles and air compressors.

Uridan
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Hi,

Is there a way to calculate the velocity of air as it comes out from a nozzle? The nozzle is ejecting wind upwards and I would like to find the wind velocity with respect to the height.

I currently have the pressure that is being supplied to the nozzle and also the nozzle diameter, is there a way to find the velocity with these parameters?

Thanks
Uridan
 
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use ideal gas equation..
P1. V1 = P2. V2
and debit equation
Q= A. V
and mass equation
Q1=Q2
 
Uridan said:
Hi,

Is there a way to calculate the velocity of air as it comes out from a nozzle? The nozzle is ejecting wind upwards and I would like to find the wind velocity with respect to the height.

I currently have the pressure that is being supplied to the nozzle and also the nozzle diameter, is there a way to find the velocity with these parameters?

Thanks
Uridan

Usually, we will ask for Mass flow rate instead of velocity (FAD, Free Air Delivery = volume of air comes out at 1 atm environment).

Think about turbulence and compressibility of air after the nozzle. using pito tube to obtain the speed of air after the nozzle is completely meaningless. the speed is different at each section.

You can try to have a look on ISO1217 about measurement of air compressor at school.

I believe your nozzle is some kind of flow measurement device.
 
I have a post somewhere on here of the analytical solution of an axisymmetric jet. That should be essentially what you're looking for. Try doing a search for it.

The problem is not as clear as one would think. This all really depends on the accuracy needed though.
 

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