Measure dynamci pressure
 

Dear Friends,

Is it possible to know the direction and the magnitude of the airflow by a Pitot tube.

How to know the Direction??

Thank you in advance.

Best Regards

Eric

Re: Measure dynamci pressure
 

Rotate the tube until you measure the largest total pressure?

Re: Measure dynamci pressure
 

Thank you for your response.

Could you tell me which book or paper I can find that?

Mang thanks.

Re: Measure dynamci pressure
 

It is quite difficult to obtain an accurate measure for the direction of flow with a single pitot probe. The pitot probe is quite insensitive towards angle (which is actually a desired property, as you typically want to get an accurate total pressure measurement without knowing the exact flow angle). A single proble will give you an angle with no less than plus/minus 5 degrees error, typically. This may be good enough, depending on your application. If you need higher accuracy, any book on flow measurements will help you to find suitable devices and techniques to measure angles. For example, a five-hole probe makes use of total and static pressures measured on a typically spherical head to determine flow angles.

Re: Measure dynamci pressure
 

Many Thanks。

Re: Measure dynamci pressure
 

Dear Mr.Mani, Thank you for your reply in detail. As in my case, the total pressure and the angle of the fluid had been measured by other people with one hole Pitot tube. The angle of the dynamic pressure is decided by rotating the Pitot tube, is it right? And what is the relation between that angle and the velocity(x,y,z dorections) gotten by CFD?

Thank you in advance.

I am badly needed it for my paper.

Thank you very much.

Eric

Re: Measure dynamci pressure
 

Someone please help me.

Thank you in advance.