The fan that rotates slowly is not noisy, but the resulting wind power is weak. On the other hand, the spinning fan produces a strong airflow but often makes noises.
Dyson designed the fan without fan blades, circled and redesigned the airflow and strengthened it with a multiplier water technology. Then where does the air flow?
"The secret is at the foot of the fan, there is a cavity in which there is a quiet vacuum machine, the air is sucked and then distributed to the circular channel above it, explained Jia Min Tan, Dyson Acoustic and Vibration Analysis Engineer"
"The principle follows Bernoulli's laws of physics, because the air pressure generated around the circle is higher than that of the moving air, then the low-pressure air behind the fan will be sucked into the circle, and pushed forward, with the air being exhaled stronger."
The technology behind it is a Dyson-made air-suction motor that, despite its small size, can suck strongly. Its fan rotation reaches 110,000 rotations per minute (RPM), much faster than F1 racing engine speed (15,000 RPM).
Generate a stronger airflow already, then how does Dyson eliminate the noise? Dyson took an acoustic engineer, Jean-Baptiste Blanc to remove it.
By adopting Helmholtz (Helmholtz Cavity) cavity technology, the fan-generated airflow will be trapped in a cavity first to change the amplitude, so that the resulting sound waves are more aligned without turbulence.
That's how Dyson makes a fan without a blade that drains the air faster but with a slight noise.
Source:
https://youtu.be