Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Vertical Wind Tunnel and Selection of Fan(s)

Vertical Wind Tunnel and Selection of Fan(s)

Vertical Wind Tunnel and Selection of Fan(s)

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.

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

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

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - Reshoring Prototyping and Production
In this whitepaper, we'll provide insight into why and when it makes sense for U.S. manufacturers to reshore prototyping and production, and how companies can leverage the benefits of working with local design, prototype, and manufacturing partners during the pandemic and beyond. Download Now
Engineering Report - Top 10 Defect Types in Production
This 22-page report from Instrumental identifies the most common production defect types discovered in 2020, showcases trends from 2019 to 2020, and provides insights on how to prevent potential downtime in 2021. Unlike other methods, Instrumental drives correlations between a variety of data sources to help engineers find and fix root causes. Download Now
White Paper - Addressing Tooling and Casting Requirements at the Design Stage
Several of the tooling and casting requirements of a part can be addressed at the design stage. If these requirements are not addressed at the design stage, lot of time is spent in design iteration when the design reaches the die caster. These design issues lead to increase in time and cost of production leading to delay in time to market and reduced profits for the organization. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close