Finding volumetric flow rate from pressure?

AI Thread Summary
Calculating the volumetric flow rate from instantaneous pressure is possible, but requires additional data and assumptions, such as the size of the intake port and whether the flow is laminar or turbulent. The discussion emphasizes that air likely enters through the intake port, and if the airflow is noisy, it is probably turbulent. To proceed with calculations, one needs to obtain the intake area and cylinder geometry. Specific formulas for these calculations were not recalled by the participants, indicating a need for further research. Understanding these parameters is essential for running a CFD simulation of the engine's intake system.
U6an
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Hello everyone,

I am quite new to Fluid dynamics, so I would like to ask for your help.

Is it possible to calculate volumetric flow rate from the instantaneous pressure?

We need to know the flow rate of the air entering the cylinder in the engine due to the suction pressure. It is required to run a CFD simulation of the intake system.

Regards,
U6an
 
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U6an said:
Is it possible to calculate volumetric flow rate from the instantaneous pressure?
Yes, but you need more data and some assumptions.
U6an said:
We need to know the flow rate of the air entering the cylinder in the engine due to the suction pressure.
You need the size of the hole the air enters by. You also need to specify whether you assume laminar air flow or turbulent.
 
Svein,
Thank you for you reply.

Could you please tell me if you mean the bore of the cylinder or the intake port diameter?
The flow will probably be turbulent, but I am not sure. Could you also give me a hint on how can I know if the flow is turbulent or not?
 

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U6an said:
Could you please tell me if you mean the bore of the cylinder or the intake port diameter?
I assume that the air enters through the intake port, so that is what is needed.
U6an said:
The flow will probably be turbulent, but I am not sure.
I agree that it is probably turbulent (if the air entering the system makes a noise, it is turbulent).
 
Svein said:
I assume that the air enters through the intake port, so that is what is needed.
Indeed, air enters the cylinder through the intake port :)

Thank you for giving a hint on the noise ;)

Providing I will obtain the intake area as well as the cylinder geometry, what steps should I take then? Are there any certain formulas for that?
 
U6an said:
Providing I will obtain the intake area as well as the cylinder geometry, what steps should I take then? Are there any certain formulas for that?
Yes, but I do not remember them (I did some work with air pressure across a small valve - 35 years ago).
 

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