J. Phil Thien's Projects

Youtube DIY link on how to make a flared port tube:

http://www.youtube.com/watch?v=fzdnlBkG2mI

Not sure about HSE practices (electrics and H2O!) but the technique looks fairly simple. Might give this a go on my 150mm (6in) connector pipe between separator and impeller housing.

Any suggestions on how to square off a large diameter pipe? I received a rough hand sawn length of pipe which needs squaring first. I'm even struggling to draw a straight line around the pipe so I can cut and file to the line.

Thanks.

Quote from: retired2 on October 14, 2011, 06:23:07 PM

Sometime earlier I posted this paragraph from a Cincinnati Fan Engineering manual regarding duct inlet spin.

Duct Inlet Spin
"A major cause of reduced fan performance is an inlet duct connection that produces a spin or pre-rotation of the air entering the fan inlet.  Inlet spin in the same direction of the fan wheel will reduce air volume and pressure ratings.  Inlet spin in the opposite direction of the fan rotation will substantially increase the motor horsepower requirements.  An ideal inlet condition is one which allows the air to enter the fan axially and evenly without spin in either direction."

Interesting to see that air rotation in any direction is detrimental to performance.

Also interesting to note entrance design losses (attached).

Appreciate all the effort you've put into testing and reporting back your findings.