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Visualization of air flow using a Direct current-
type wind tunnelAburaya Narimasa
Ogawa Tsukasa
Kita Hiroki
Takeuchi Yoshiki
Research motiveCars and planes play an
important role.In order to know the effect
of wind flow has on the object.
Wind tunnel experiments using circulation type tunnel.
PurposeCreating a DC-type wind tunnelVisualization of wind flowImpact of wind flow on the wing Pursuit of the ideal shape for a
wing
DC-type wind tunnel
Circulation type wind tunnel
Ebara Hamada Blower Co., Ltd.From the homepage
West Japan Fluid Engineering Inc.From the homepage
DC-type wind tunnelAdvantages・ Simple structure (low cost) ・ Performance and high rectification・ Can be miniaturized
Drawbacks・ Susceptible to effects from the outside
Circulation type wind tunnel
Advantages・ Less susceptible to external・ Energy Conservation
Drawbacks・ Complex structure (high-cost)
Wind tunnel that we used
(mm)
Experiment 1 Verification of the effects of the rectifier
For uniform flow
Visualization of wind flow
Smoke machine (ANTARI Z-800 )Ⅱ
Effect of Rectifier on wind speedWhen there is not a rectifier
→Scattered by the wind measurement location
When there is a rectifier
→Wind speed is slower and stable
ConditionsUnification at 12VChange the wind direction
Attach the blower to one side only
Wind speed measuring instrument
DT-8880 hot-wire anemometer
Experiment setup
About uniformity of wind speed(send the wind) (m/s)
There's not a rectifier There is a rectifier
Center 1.00 0.73Center(Upper side ) 2.26 2.36Center(Lower side) 1.47 2.39Upper left 2.90 1.15Left of center 3.01 2.15Lower left 2.42 1.08Upper right 2.14 1.16Right of center 2.18 2.67Lower right 2.41 1.25
About uniformity of wind speed(inhale the wind) (m/s)
There's not a rectifier There is a rectifier
Center 2.35 1.88Center(Upper side ) 1.39 1.42Center(Lower side) 2.31 1.71Upper left 1.16 1.47Left of center 2.19 1.67Lower left 1.82 1.71Upper right 1.33 1.59Right of center 1.96 1.77Lower right 1.67 1.72
Considerations of Experiment 1
Blowing → Wind speed is unstable
Inhaling → Relatively stable
↓
We chose to use the inhaling method.
Experiment 2 Visualization of wind flowModel of car
Videos of the wing model
Consideration of Experiment 2
We have confirmed the effect of laminar flow by rectifier.
Wind flow is flowing along the objects.
We have found the wind that was peeling at the rear of the wing.
Experiment 3 Why float the wing?
PredictionWind speed difference is born from the difference in distance above and below the wing
Experimental method
Measuring method
Considerations of Experiment 3
There is a possibility that the wind speed difference causes wings to fly.
Future prospectsRelationship between
elevation and separation of the air flow
Relationship between elevation and lift
Ideal shape for a wing
Thank you for listening!