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Bladeless Fan

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by

Steven Yoo

on 6 September 2014

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Transcript of Bladeless Fan

Design and Prototype Fabrication of Bladeless Fan
Presented By: Yoo Siang Yaw
Supervisor: Mr. Tan Lai Poh
Moderator: Mr. Logah Perumal

Introduction
Sucks air into a loop known as Air Multiplier by using an impeller and amplify it through air entrainment and air inducement.
Motivations
Bladeless fan is
safer
since it does not has any moving blades
Bladeless fan has a
sleek and high-end design
. Conventional fans have an ugly grille to provide protection
Bladeless fan generate a
more comfortable breeze-like
wind without buffeting. Blades in conventional fan chop and constantly disrupt the moving air
Light material of bladeless fan (ABS) causes
less damage
as compared to heavy metal used in conventional fan when it fall on ground
Objectives
1. To study the working principles of a bladeless fan and explore every physics principle that is involved
2. To design a bladeless fan with evenly distribution of air in a good flow rate and velocity
3. To fabricate a well-designed bladeless fan with proper selection of sub-assembly components
4. To test the overall performance of the fan in every needed aspects
Conceptual Design
Fabrication Method
3D Printing
Injection Moulding
A manufacturing process for producing parts by injecting material into a mould.
A process of making a 3-D solid object of virtually any shape from a digital model by printing the real object slice by slice.
Comparison
Advantages
Manufacture of customized product
Takes very short time for design to get converted into prototype
Low cost for low quantity production
Low risk
Disadvantages
Not suitable for short run production due to high cost of tooling and cost of operation
Design and development of part takes a very long time
Mould have to be made by professional mould-maker
Injection Moulding
3D Printing
Overall Shape - Circular
More even air distribution
90 degree bend without suitable radius of curvature will increase loss coefficient
• 130 mm × 130 mm × 130 mm

210 mm × 210 mm × 210 mm
• 380 mm × 380 mm × 380 mm

Size of the fan
Material of Prototype
ABSplus is Stratasys 3D printing material
ABSplus is a true production-grade thermoplastic that is durable enough
Impact strength which is approximate 37 MPa under ASTM D638 test
Good chemical resistance and abrasion resistance
Light weight thermoplastic material gives the fan better mobility
Not easily to be broken or contribute damage when it falls
AC
and
DC
motors

Speed of rotation of
DC motor
can be controlled by varying the current to the windings. Increasing current will increase the speed.
Speed of
AC motor
is a function of the frequency of the supplied AC power. Since the frequency of the AC power is constant, the speed of AC motor is constant as well. It is harder to control frequency rather than supplied current.
• Longer life since no brush
• Required less maintenance
• High efficiency since no voltage drop across brushes
• Better heat dissipation
• Greater range of speed
• Low electric noise generation

Brushless DC Motor
FAN
Axial
Radial
MixedFlow
Good air flow rate
Achieve higher pressure than axial fan
No ducting required and installation is easy
Increased air friction with wall
Leakage of air
Air pressure drop
Injection Moulding
3D Printing
Separated Connecting Path
Design Parameters
• Airfoil profile
• Ramp length
• Slit size
• Degree of Coanda surface
• Air flow guide
• Air block

65mm = RM 500

80mm = RM 750

95mm = RM 1000
Annular slit preferably having a relatively constant width in the range of 0.5 to 5 mm
Air supply from base is approximately 30 litre/s which equivalent to 0.03 m3/s
In general, jet of air come out from slit at velocity about 25 m/s.
Slit Size
Ramp Length
Degree of Coanda Surface
12 Degree
16 Degree
20 Degree
Air Flow Guide
Without Flow Guide
Smooth End
Guide With 45 Degree Edge
Guide With 90 Degree Edge
Air Block
Without Air Block
With Air Block
Inverted D-shape air block
To avoid air turbulence happen at outlet
To block the air coming from other direction thus air flow chaos would not happen

It more accurately predicts the spreading rate, as well as handles problems involving boundary layers under strong adverse pressure gradients, flow separation, and recirculation.
3-D Revolution of Bladeless Fan
Stage 1: Bladeless Fan Ring
Stage 2: Connecting Path
Stage 3: Bottom Ring
Stage 4: Assembly
Air Block
2 mm slit
16 Degree Coanda Surface
45 Degree Edge Flow Guide
Front
Back
NACA 4316 Airfoil
Air Entrainment
Air Inducement
31 dB
58 dB
51 dB
31 dB
31 dB
58 dB
58 dB
51 dB
49 dB
50 dB
Limitations and Problem Encountered
Fabrication Way
Size Limitation
Budget Limitation
3D Printing
Inject Moulding
210 mm X 210 mm X 210 mm
380 mm X 380 mm X 380 mm
RM 500
RM 1800
2 mm -> 1.5 mm
80 mm -> 65 mm
In- Campus
Out-Campus
Time Limitation
2D and 3D Simulations Took Time
Long queue for FDM
Principles involved in designing and operating bladeless fan were investigated and implemented in designing the fan.
Prototype has been successfully fabricated
Further modification and variety of performance tests have been done
It perform with a good air flow rate, even air distribution and suitable sound level
Extra cooling feature has been adapted
Adjustable Slit Size
Volumetric flow rate measuring instrument
Laser Doppler Anemometry
Pitot-Static Manometer
Existing Bladeless fan is in bigger diameter which is 300 mm or 350 mm
According to Vincent San Miguel, "Computational Fluid Dynamics," NASA USLI Preliminary Design Review, p. 29, October 2012.
Conservation of mass & Conservation of energy
Bernoulli's Principle
According to Charles N. Eastlake, "An Aerodynamicist's View of Lift, Bernoulli, and Newton," vol. 40, 2002.
Instrument Limitation
Feeler gage
A proper volumetric flow rate measuring instrument
Air ionizer and humidity control
Flow over a flat plate
Transition from laminar to turbulent flow
Laminar Flow
Stratasys Dimension
Mixed-Flow Impeller
Conclusion
Recommendations
Meshing
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