Pneumatic Assisted Separation - Page 3 - The Combine Forum

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post #21 of 51 (permalink) Old 05-05-2016, 01:34 AM Thread Starter
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Khigerd: We have considered that possibility and have 2 design mods that could be used if it does become problematic. One is an easily removed cover over the "dead air space" at concave end that would make it easy to clean. I think it highly unlikely that material would go through with enough rigidity remaining to bridge the slots. Time will tell.
Pic today while we were blowing air through taking pressure/windspeed measurements.

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Last edited by SunnybrookW&M; 05-05-2016 at 01:37 AM.
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post #22 of 51 (permalink) Old 05-06-2016, 03:46 PM Thread Starter
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So basic static and dynamic testing is complete. It looks like we're moving on. Airflow study on why things do what they do would be a study of it's own. I had asked by brother in law six months ago, (he's a Tenured Professor of Aeronautical Engineering at University of Toronto) he took a pass on advice. Now I know why. Six bolts, take one out and air blows out but do the same with the next bolt and air sucks in ??. When we go to the field, our initial "Air Separating for Dummies" logic says the "best guess" velocity at each jet should be about 2.2 mph for each 100 rpm rotor speed. That will allow air leaving the jet to bridge the proceeding rasp bar, make it to the cage) on the circumference (we hope). On the video link we were getting 3.6 mph at 160 RPM. (1.6 x 2.2 = 3.52)....hows that for s--t luck !

All of our testing was done with a set pitch angle of 15 degrees on the axial fan. 13 is about the minimum output, 24 about maximum.

PAMI has better gear for measuring the air dynamics so we'll be working with them in July to analyze and baseline running data. I don't know how much patience the guys testing this in July-Sept will have !

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post #23 of 51 (permalink) Old 05-11-2016, 01:51 PM
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You have my sympathy.....all the effort to test it on the table and may well not be the same animal when stuck in a cage,but you gotta try and make an educated effort! Then comes the real world testing and everything you thought you proved in the shop goes out the window!!LOL! Not funny really but ain't that the way it goes?
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post #24 of 51 (permalink) Old 05-30-2016, 12:57 PM Thread Starter
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Pump air to bump rotor performance - The Western Producer

It's been a trying few weeks playing with the air flow on the test bed. Our initial few days were nothing but completely discouraging. Only after we realized what a huge impact the discharge paddles played in the airflow equation (and eliminating their effect) could we actually generate any useful data on air exiting the orifices near the discharge. Anyway, off to the field this week and next to dry run and process some material (by pitchfork. very low feed rate).
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File Type: jpg stop sign with seal.jpg (276.2 KB, 126 views)
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post #25 of 51 (permalink) Old 05-30-2016, 07:26 PM
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SunnybrookW&M - surprised you don't have a shroud around that blue fan!
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post #26 of 51 (permalink) Old 05-30-2016, 07:43 PM
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Quote:
Originally Posted by SunnybrookW&M View Post
We’re buying high end axial fans, and the only way they come is with adjustable blades. We’re installing them on a shaft that accelerates from zero to 1,000 r.p.m. in just two r.p.m., powered by 250 h.p. Cheaper fans just won’t take that. We make the steel vane centrifugal fans ourselves.”
Not sure the cylinder can accelerate that fast, never gave that any thought but the are times it decelerates 1,000 to zero in less than 1 turn.
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post #27 of 51 (permalink) Old 07-06-2016, 04:59 PM Thread Starter
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First field day of testing for the pneumatic rotor, sorry for finger grate and body panel removal but we needed access for airflow analysis. We'll be in crop harvesting within 3 weeks. So far all thumbs up. See attached pics for what the visual change to the combine will be.
Detail of inner seal (fixed to stop sign) to be modified, likely three piece removable. There is a possibilty a HUGE benefit can be gained by leaving 1/3 of the seal off and freeflow air from the centrifugal fan to feed the chopper/impeller. Cage was kept clean with only limited material throughput during testing. Louvers stayed clean on rotor channels.
800 RPM generates 16 MPH air draw at the Axial fan (Roughly 850 CFM) adjustable Axial fins are at 21 degrees, 24 is max volume.
Real testing starts soon enough, we're a lot more confident today than a week ago. PAMI guys are by next week to help/recommend improvements to air flow and dynamics.
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post #28 of 51 (permalink) Old 07-06-2016, 09:09 PM
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No shroud around the fan?
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post #29 of 51 (permalink) Old 07-07-2016, 02:53 AM
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A proper shroud would increase the efficiency of the fan and give higher air flows if need be. It could be very easily incorporated into the metal work on the stop sign.
C5964.JPG
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post #30 of 51 (permalink) Old 07-07-2016, 02:37 PM Thread Starter
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yes, we are considering design of the shroud...sound advice. First design change was the seal inside stop sign. we will modify it to a 4 piece (90 degrees each), installed before the fan goes on. I strongly believe we'll see the "3 to 6 o'clock" be left off intentionally, allowing leaked air to fill chopper/discharge demand. thanks chance2/khigerd/flatfoot.
Same hardware affixing seal can be used for shroud (8 by 3/8" bolts)

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Last edited by SunnybrookW&M; 07-07-2016 at 04:42 PM.
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