Was the Dyson fan really as good as they make it sound?
I was interested in purchasing one, not to use as a fan per-say, but just to study its working.
I cannot understand how they managed to produce a powerful breeze by using a base-mounted fan blowing air through an annular ring. It just doesn’t compute.
That’s probably why it’s $300. Lots of research and design.
If you live near a Best Buy Store you can see them displayed.
It is really neat, a steady stream of air with no pulsations in it, rather like a steady breeze when you are up close.
It’s not the resonating frequency you get from a regular fan like the commercial says, once you know to look for it you realize it’s not there.
It probably works like an ejector pump. Deep well jet pumps use this principle. A high speed jet of fluid (air, water) will accelerate the fluid around it thereby moving a larger quantity at a lower velocity.
Dyson uses a ring shaped jet to “pull” more air through and around the ring. Neat execution.
If you have access to a garden hose try this experiment. Run enough water on the pavement to make a puddle. Try for 6 feet diameter or larger and at least 1/2” deep. Set the hose nozzle on a high speed jet position, hold it close to horizontal and aim the stream at a point about 1/3 of the distance across the puddle. The stream will hit the puddle and continue, pulling additional puddle water with it and eventually emptying the puddle.
Voila! an ejector pump.
Try a net search for their patent.
Not a big one; just 'table sized' model, that I stood in front of - and enjoyed breeze - then, of course, had to put my hand through center just to make sure/sigh. . .
Reminded me of some 'great leap' from the past. (And given, Telsa's determinations; it is, really. . .
Loved the 'purity' so to speak; of this great design/MO. . .while wondering 'how it is' we never had this!