Billionaire British inventor Sir James Dyson is hoping to revolutionise the heating and cooling sector with his latest invention, a bladeless fan known as the Air Multiplier.
Dyson says conventional electric fans have gone largely unchanged. The fundamental problem has remained the same for more than 125 years – namely that the blades chop the air, creating an uneven airflow and unpleasant buffeting.
Dyson’s fluid dynamics engineers spent four years running hundreds of simulations to precisely measure and optimise the machine's aperture and airfoil-shaped ramp before perfecting the Air Multiplier technology. Air fluctuations were mapped with laser Doppler anemometry, helping measure and control the machine’s airflow.
“We realised 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.”Air is drawn into the base of the machine. It is forced up into the loop amplifier and accelerated through the 1.3 mm 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 (an effect known as inducement).
At the same time, the surrounding air from the front and sides of the machine are forced into the air stream (an effect known as entrainment), amplifying it 15 times. The result is a constant uninterrupted flow of cooling air.
The Dyson Air Multiplier fan is powered by an energy efficient brushless motor, and the air speed can be precisely adjusted with a dimmer switch. Conventional fans are wired to run at just two or three settings. No blades also mean there is no need for a grille, and it is safe and simple to clean.
Since the motor is at its base, the Dyson Air Multiplier fan can be tilted with a touch, unlike a conventional top-heavy fan, which needs to be positioned with two hands and can topple easily.
From the NET
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