Development of a high flow rate cantilever fan

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Fig.1. A commercially accessible Piezoelectric fan. The aboriginal 30 mm is the polymeric fan blade. Credit: Peter Leaback

Cantilever admirers move air through a aerial action, agnate to hand-fans. Commercially available, they are accumulated with a piezoelectric bender, which provides their motive force. These admirers are low noise, low ability and accept a low breeze rate. They accept a advantageous alcove for accretion the cooling of electronics above that of accustomed convection, after acute aerial breeze rate.

I accept developed a axle fan architecture with a added than 100-fold added volumetric flow rate, and I accept approved it can be aggressive with axial admirers in breeze amount and babble level. I accept this accessory could accessible opportunities for added acceptance of axle admirers in affective air and cooling applications.

A archetypal piezoelectric fan is apparent in amount 1. It consists of a polymeric fan blade and a piezoelectric bender. When the bender vibrates at the beating abundance of the fan blade, the fan tip moves with a angle of a few centimeters and appropriately moves air. As there is no basin or aperture to the fan, the air movement is bedeviled by recirculating vortices. However, there is some net advanced drive imparted to the air, appropriately a bashful net breeze of air.

The architecture I developed is apparent in amount 2. In the centermost of the rig are three stainless animate fan blades corrective chicken for clarity. Each fan casting is 15 cm by 14 cm. The arrangement is apprenticed by two custom beeline motors affiliated to either end of a beating beam, which in about-face is affiliated to the abject of the three fan blades. The admirers are apprenticed at 20 Hz, which is a abundance below that of animal hearing. This banned the aural complete to alone the agitated agitate of the air affective accomplished the blades.

Development of a aerial breeze amount axle fan. Fig 2. Photographs of the fan implementation. Left appearance the fan aperture with 3 admirers corrective yellow, cellophane top and basal shrouds and white ancillary shrouds. Right shows the basin ancillary of the fan structure, which capacity the beeline motors on the larboard and right. Credit: Peter Leaback

Approach to added breeze rate

The ample access in breeze amount can be attributed to the accumulated accoutrement of several factors. The beeline motors are essentially added able than piezoelectric benders, the fan blades are larger, the fan blades are fabricated from bounce steel, assorted admirers are accumulated into arrays, and cardinal adjustment of shrouding reduces vortices.

My paper, published in Results in Engineering, shows that the best acceleration of the fan tip depends on the backbone of the actual (more specifically, the ability limit), the Young’s modulus and density. Spring animate has an awfully aerial ability limit, so the tip acceleration of the fan is college than polymeric fan blades.

Using added than one fan in an arrangement is additionally important to aftermath a aerial breeze rate. My cardboard shows that a minimum of two admirers are appropriate to abbreviate a cuboid of air, which is accelerated forward, as the admirers beat larboard and right. This can be apparent in the paper’s accompanying slow-motion video.







Credit: Results in Engineering (2023). DOI: 10.1016/j.rineng.2023.101602

The cardinal adjustment of shrouds contributes to the aerial breeze amount by abbreviation recirculation vortices. By agreement shrouds at the top and basal edges of the blades, the air is prevented from circulating from the aerial to low burden abandon of the fan. Also, agreement shrouds at the larboard and appropriate of the fan arrays prevents backflows and creates a categorical basin area.

Context and conclusion

The all-inclusive majority of bartering admirers can be classified as axial, centrifugal, mixed-flow, or cross-flow fans. The best contempo accession to this account was the cross-flow fan, invented in 1893. Each of these fan types has its strengths and has begin applications that comedy to these strengths. This axle fan architecture with commensurable breeze amount to an axial fan could acquisition appropriately advantageous applications.

Two of its different strengths are the abolishment of any address or abrading surface, and due to the abridgement of rotation, it has the abandon to actualize altered aspect ratios of the fan basin rectangle. The assignment presented in the cardboard has no bookish acreage protection, and is accordingly chargeless for added experimentation.

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More information:
Peter D. Leaback, A aerial volumetric breeze amount infrasonic axle fan, Results in Engineering (2023). DOI: 10.1016/j.rineng.2023.101602

Peter Leaback able with a BSc(Hons) in Computer Science from Kingston University, London in 1992. He spent 15 years designing algorithms for silicon chips and is now an absolute artist with a focus on altitude change mitigation.

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Development of a aerial breeze amount axle fan (2023, November 27)
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