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# Vertical Wind Tunnel and Selection of Fan(s)

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## Vertical Wind Tunnel and Selection of Fan(s)

(OP)
Hi, I will like to design this vertical wind tunnel (large nozzle) to shoot air out at 10 m/sec at the exit and a diameter of 8 ft vertically downwards.
However I want to understand the following parameters. Does anyone know about this? and know how to calculate the following parameters ?:

We want V2=10m/sec (outlet velocity at jet)

I want to design a fan or number of fans arranged (or framed together) that can do the job and how can these fans be selected?
How can I calculate the inlet flow Q1?
How can I calculate the inlet velocity V1?

The required outlet velocity must be 10 m/sec, The outlet diameter is 8 ft.

1. Does the contraction ratio (Alarge/Asmall or Ainlet/Aoutlet) should be kept at 8 only from a square to circular contraction? or can any contraction ratio should be used?
2. Does the continuity equation applies here? Can you find the total required flow rate Q1 if you have V2=10 m/sec? Can you use: Q1=Q2 thus Q1=A2*V2? what about the losses?
3. How do you find the total loss?
4. How do you find the dynamic head (both at inlet and outlet)?
5. How do you find the static head (both at inlet and outlet)?
6. How do you find the total pressure head?
7. How do you find the total power required (horsepower)?
8. How do you find the "Backpressure of the system?
9. How do you find the pressure being pushed through the exit cone?
10. How do you find the total pressure in inches of water?
11. How do you select a fan? what parameters do you need?
12. How do you select a complete multiple fan assembly?
13. Can I place several fans in a rectangular matric at the inlet or can they be placed circular? what is the best way?
14. What is the best material to build this of? (aluminum, steel or plywood?) what thickness is ideal?
15. What is a good physical closing-opening mechanism at the outlet?
16. How can a frame be designed to hold something like this?
17. Can all these parameters be obtained from an Ansys v19 simulation?
18. How can this be developed simple in Ansys 19 fluent if I have the CAD file?
19. How can I develop a Matlab script for something like this?

Thank you

### RE: Vertical Wind Tunnel and Selection of Fan(s)

Suggest you famialiarize yourself with basic fan laws and then cut your list of questions down to perhaps four. Nineteen questions is a bit excessive for a forum like this and your project will likely have substantial capital costs...... not an ideal scenario to start learning the basics.

### RE: Vertical Wind Tunnel and Selection of Fan(s)

I am just familiar enough with one of the oldest vertical wind tunnels (1944 @ Wright-Patterson AFB, OH) to know that you are taking on a daunting project. You may be able to find some guidance using the specialize search engine Google Scholar.

### RE: Vertical Wind Tunnel and Selection of Fan(s)

Yikes. Is this a record for the most questions ever asked in a single thread?

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