Most people don’t realize it but a Dyson fan really does have blades. The blades just happen to be engineered into the base of the fan so that you don’t see them.
The pedestal base draws in roughly 5 gallons of air per second or about as much as a normal household vacuum cleaner.
In addition to the blades in the pedestal base, the air multiplier also makes use of a brushless electric motor, which rotates the nine asymmetrically-aligned blades. This provides for precise control of the speed of the fan while staying relatively quiet compared to brushed motors. The pedestal motor adds an extra push to the fast flowing air and shoots it up into the ring portion of the fan.
The air flows design through the channel in the pedestal, through a curved path, and comes out from small 16mm slits around the frame of the fan at a 16-degree angle slope. You may think that this just causes air to blow in the shape of the surface area of a cylinder, but because of the physical laws of inducement and entrainment, this allows for the surrounding air to also become drawn in from multiple areas around the fan.
In other words, picture your TV weather map; a small low-pressure region is created which actually draws the air in from behind it, like a forming tropical storm. This simultaneous push and pull of air creates a quiet, even, a constant flow of cool breeze.
Why We called “Air Multiplier”?
Making use of these laws, Dyson claims that the output of airflow is increased 15 times more than that taken in through the pedestal’s motor, thus the name is air multiplier. The result is a filled cylinder of air flowing smoothly without the choppiness of traditional fans. some users have claimed that it can be rather noisy, but the Dyson Air Multiplier provides an eye-pleasing, low power consuming fan that is safe to use around young children due to the lack of accessible rotating blades.
I found a link showing a balloon being “induced and entrained” in a lab.The balloon is drawn around the lab by about 50 Dyson Fans. It’s actually really cool to watch how it works.