Turbulence and Pitot Tube

What are you using the pitot tube for? Hopefully not for flight. They generally like smooth air flow.

Thanks for your question and interest. In my case the application is just measuring flux rate in a duct.

You say measuring "flux rate" is this regarding fluctuation in pressure or mast flow. "The pitot tube is used to measure the local velocity at a given point in the flow stream and not the average velocity." An anemometer is more tolerant of turbulence and better for mast flow, depending on what your trying to do. Don't know if this helps any. DJ

Thanks for your help. I'm aware of your point. In that case is possible to use an Annubar tube for measuring the dynamic pressure. I can have an average through the whole diameter of the duct. But actually my question is if you know where can i find a research document which could analyzed turbulence conditions using an annubar or pitot tube and the accuracy of the obtained data.

This is what I found doing a quick google search. Look thru them and see if there's something you can use.

Well i found almost the same. But i would like to find something more related with design of the pitot tube instead of a commercial products.

I have a question for you, " Are you a student that needs some help designing a " Pitot system?" I seen on your post,(http://cr4.globalspec.com/comment/606583/Re-Access-Database), that you say your "electromechanical engineer", but your questions sound like a student. It seems like your looking for someone to do your research for you. If you are a student and needs help, be honest and say so. People on CR4 are willing to help students that ask for some help with a problem, but "We" do not like giving answers to homework, that's all part of your education, (doing research).

A Pitot system can be very simple, like a tube parallel to and in the stream flow. Or more complex as used in aviation. It depends on what type of fluid you want to measure and how accurate your measurements needs to be. Now, in your OP, you said, "I would like to know if its possible to use a pitot tube for a turbulent air flux". The answer is yes you can with a "pitot/ static( more complex) system attached to a chart recorder for more accurate reading. So, try researching, factors of designing a pitot tube. Good Luck, DJ

Thanks for your interest. I work in a company wich i located in costa rica. Im engeenier but actually instead of buying devices i preffer to try designing by myself. Of course there are products to solve some needs we have but the problem is that actually i think the pitot tube should be very simple to construct and the design its easy apparently. If you read my question carefully youll find that I have a very specific question. The company where I work produces glass bottles. and the machines are old and we want to measure the flux rate of compresed air in those machines. I would like to try saving some money and construct what we can construct and buy only those devices wich are very necesary like transmisors, DAQ and the SCADA software. We dont know exactly if the flux its laminar or turbulent so i would like to make some proves before to buy anything. Do you know if its possible to measure the dinamic pressure into a turbulent flux using a pitot tube and where can i find some research related because to have that information will be useful for my design. Thats it

I don't know if you have seen this research, otherwise I don't know what else I can do for you. DJ

Thank you dear friend. Im still checking the link you gave me. Ill let you know how it goes.

Best regards

marzini, I'm curious, is the equipment used for injection blow molding? And, if it is, are you getting air bubbles in the finished product? Why is the turbulence a concern?

If I had a had a better idea of your problems, I might be able to help you better. DJ

Thank you dear friend. Actually the air has many applications in those machines. Some of them are for blowing but it is used for actuators too. For example each module of the machine has 14 different types of air. And every machine has 8 modules. Of course those lines have different diameters and pressures. I need to meassure the flux rate in the main lines and some of the others. As you can see here the problem is that is difficult to ensure what is the nature of the flux.