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
Messages
3
Reaction score
0
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
 
Physics news on Phys.org
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?
 

Attachments

  • 72180-035-B143017A.jpg
    72180-035-B143017A.jpg
    25.1 KB · Views: 653
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).
 
Thread 'Is 'Velocity of Transport' a Recognized Term in English Mechanics Literature?'

Thread 'Is 'Velocity of Transport' a Recognized Term in English Mechanics Literature?'

Here are two fragments from Banach's monograph in Mechanics I have never seen the term <<velocity of transport>> in English texts. Actually I have never seen this term being named somehow in English. This term has a name in Russian books. I looked through the original Banach's text in Polish and there is a Polish name for this term. It is a little bit surprising that the Polish name differs from the Russian one and also differs from this English translation. My question is: Is there...
View full post »

Thread 'Inclined treadmills and Galilean Invariance'

This has been discussed many times on PF, and will likely come up again, so the video might come handy. Previous threads: https://www.physicsforums.com/threads/is-a-treadmill-incline-just-a-marketing-gimmick.937725/ https://www.physicsforums.com/threads/work-done-running-on-an-inclined-treadmill.927825/ https://www.physicsforums.com/threads/how-do-we-calculate-the-energy-we-used-to-do-something.1052162/
View full post »

Thread 'Is calling fictitious forces "not real" just about terminology?'

Hi there, im studying nanoscience at the university in Basel. Today I looked at the topic of intertial and non-inertial reference frames and the existence of fictitious forces. I understand that you call forces real in physics if they appear in interplay. Meaning that a force is real when there is the "actio" partner to the "reactio" partner. If this condition is not satisfied the force is not real. I also understand that if you specifically look at non-inertial reference frames you can...
View full post »

Similar threads

PressureDrop/Pressure/Volumetric flow rate calculation (in a Pipe)
Replies
5
Views
4K
I Steam flow rate in 2-chamber steam engine system
Replies
4
Views
2K
Pressure Gradient for Nitrous Flow
Replies
2
Views
1K
Volumetric flow rate of a pipe
Replies
19
Views
3K
Volumetric flow rate of nitrogen through relieving pressure regulator
Replies
3
Views
2K
What is the relationship between pressure and flow rate?
Replies
8
Views
4K
Inconsistent flow rate measurements of an engine diesel fuel
Replies
12
Views
3K
Doublet flow in Fluid Dynamics between two spheres or cylinders
Replies
0
Views
1K
Volumetric Flow Rate through a Venturi Meter
Replies
2
Views
3K
Can someone help calculate pressure drop ?
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top