Sunday, January 24, 2010

Dyson Bladeless Fan




"Dyson the creator of the well know vacuum cleaner has just launched the worlds first bladeless fan. The Dyson fan has no blades which means no need for a grille and it’s safe and simple to use and clean. Air is drawn into the base of the machine.
The air is forced up into the loop amplifier and accelerated through the 1.3mm annular aperture, creating a jet of air that hugs the airfoil- shaped ramp.
Dyson’s engineers spent four years building and perfecting Dyson’s Air Multiplier technology. Air fluctuations were mapped with Laser Doppler Anemometry, helping measure control the machine’s airflow.
The benefits of this tech are that there are no nasty blades to get fingers caught up in, but also that there’s no “buffeting” — that on-off gush of air caused by fan blades unceremoniously chopping up the air into inelegant segments.
“We realized that this inducement, or amplification, effect could be further enhanced by passing airflow over a ramp,” says Dyson. “And of course this was the point where the idea of a bladeless fan became a real possibility. Here was a way to create turbulent-free air and finally do away with blades.”
How it works: inducement and entrainment
Air is drawn into the base of the machine. The air is forced up into the loop amplifier and accelerated through the 1.3mm annular aperture, creating a jet of air that hugs the airfoil- shaped ramp. While exiting the loop amplifier, the jet pulls air from behind the fan into the airflow (inducement). At the same time, the surrounding air from the front and sides of the machine are forced into the air stream (entrainment), amplifying it 15 times. The result is a constant uninterrupted flow of cooling air."


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