Comments on Profile Post by Paul Myers

  1. Jim McCulloch
    Jim McCulloch
    I think so also. Will be an interesting failure analysis.
    Aug 6, 2020
  2. Paul Myers
    Paul Myers
    We are going to install some instrumentation on another unit and run through start scenarios. We want to see if the fans run in the stall zone at any point. thinking failures might be accumulated fatigue damage from that. Theoretically they should not see it. Want to see how second fan starting interacts.
    Aug 6, 2020
  3. Jim McCulloch
    Jim McCulloch
    Doesn't stall happen at low speeds? I was wondering if the RPM remains the same but the blade angle changes to vary the flow. Also, I assume you have vibration transmitters on there? Just asking, I am no expert.
    Aug 6, 2020
  4. Paul Myers
    Paul Myers
    Yes constant Rpm. Blade pitch changes for fan pressure / flow. Stall can happen at any speed if angle of attack of the blade exceeds the ability for the air to stay attached to the upstream surface of the blade. But the area it is a risk for these fans is at the lower flow. Vibration transmitters not sensitive enough to show stall. We do have stall probes.
    Aug 7, 2020