×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

AXIAL FAN FLOW

AXIAL FAN FLOW

AXIAL FAN FLOW

(OP)
I am trying to set up an axial fan rig.  I have calculated the max. mass flow through it, and now need to find out what size ORIFICE PLATE should be used.  I have a copy of BS 1042, but this is since 1943, far too old with imperial units not metric.  This has examples of how to calculate the orifice plate size but isnt too helpful for this day and age. I have looked at the new updated British Standard on-line but it is only in parts and still doesn't give sufficient detail.

I need an equation that is used to find this out.  How can I find this out? which British Standard covers this flow measurement?

RE: AXIAL FAN FLOW

Jinder, how did you "calculate" the max mass flow rate through the fan? This would be more accurately based on the fan operating curve for it's given RPM at zero pressure drop across it. Also, what is the purpose of the orifice plate - are you trying to achieve a critical flow condition (e.g., P1 << .5 P2)?

RE: AXIAL FAN FLOW

(OP)
I worked out the mass flow rate by:
m= rho*V*A
Rho =     1.164030723
Area =     0.035210185

Delta P = 0.5*Rho*V^2        
V = (Delta P/0.5*Rho)^0.5        
Rad @ mid height = 0.09625    

At the moment all it is, is a fan, it need to be used as a rig eventually.  I need to extend the flow, and fit in an orifice plate to calibrate the fans characteristics

At a blade speed of 7.559ms the mass flow rate was 0.215kg/s
At a blade speed of 16.127 ms it was 0.476kg/s

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!


Resources