How does the Dyson fan work with no propeller?

It does have a fan. It is hidden inside the base. The air from that fan is ducted up to the ring and comes out tangentially around the ring. That thin circular jet of air mixes with the air in the room and induces that air to move as well. read more

In October 2009, James Dyson's consumer electronics company, famous for its line of vacuum cleaners, introduced a new device to the market called the Dyson Air Multiplier. The Air Multiplier is a fan with an unusual characteristic: It doesn't have any visible blades. It appears to be a circular tube mounted on a pedestal. read more