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The Dyson cooling fan is an eye-catching product. At first sight, some people may wonder how the seemingly bladeless fan really works because it simply looks like a structure with no air outlet. The fact is it can does have a small outlet at the inner part of its “ring”, and has the ability to take fluid dynamics into practice and enhance the air flow, making it also an air multiplier.
Figure 1. Dyson bladeless fan and simulated air flow.
In fluid dynamics class, I and a classmate of mine decided to construct a bladeless fan by our own and study the air multiplying phenomenon. We used 3D printing to fabricate the “ring” part of the fan, and a small centrifugal fan for connecting with the inlet of the ring part and inject a strong current inside.
Figure 2. Illustration and photograph of the bladeless fan.
Now we wanted to simply test whether this structure really leads to an air multiplying effect. We divided the outlet are into 9 sections, which can be represented using a 3×3 rectangular grid, and calculated the wind speed of every section at different input voltages for the centrifugal fan.
Fig. 3 shows the air velocity profile of the output wind, and Fig. 4 shows the magnification of air flow.
Figure 3. Air velocity (t_m [=] m/s) of 3×3 section grid at different input voltages.
Figure 4. Magnification of air flow at different input voltages of the centrifugal fan.
During this project, I learned more about the fundamentals of fluid mechanics, and memorized the relevant rules more deeply, which made me have a better understanding of this subject.