Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Centrifugal Impeller and blade shapes

  1. Mar 2, 2016 #1

    Yam

    User Avatar

    According to my lecture notes, for centrifugal impellers

    Backward curved blades have a outlet blade angle of less than 90,
    radial blades have curved blades have a outlet blade angle of 90,
    Forward curved blades have a outlet blade angle of more than 90.

    As such i have 2 questions

    1) does the inlet blade angle have any relationship with outlet blade angles?
    Example, for a radial blade, inlet blade angle = outletblade angle = 90 degrees?

    2) What does it mean that the inlet velocity triangle remains the same for radial and forward vanes?
    How can they be the same when there is a centrifugal impeller adding angular momentum into the fluid?
     
  2. jcsd
  3. Mar 4, 2016 #2

    Baluncore

    User Avatar
    Science Advisor

    1. The blade must curve without sharp changes in flow direction. That relates the inlet to outlet angle.
    2. The inlet velocity triangle is ahead of the impeller so is unaffected by momentum to be added later.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Centrifugal Impeller and blade shapes
  1. Fan blade (Replies: 1)

Loading...