aburaya narimasa ogawa tsukasa kita hiroki takeuchi yoshiki
TRANSCRIPT
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Visualization of air flow using a Direct current-
type wind tunnelAburaya Narimasa
Ogawa Tsukasa
Kita Hiroki
Takeuchi Yoshiki
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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.
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PurposeCreating a DC-type wind tunnelVisualization of wind flowImpact of wind flow on the wing Pursuit of the ideal shape for a
wing
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DC-type wind tunnel
Circulation type wind tunnel
Ebara Hamada Blower Co., Ltd.From the homepage
West Japan Fluid Engineering Inc.From the homepage
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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)
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Wind tunnel that we used
(mm)
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Experiment 1 Verification of the effects of the rectifier
For uniform flow
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Visualization of wind flow
Smoke machine (ANTARI Z-800 )Ⅱ
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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
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ConditionsUnification at 12VChange the wind direction
Attach the blower to one side only
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Wind speed measuring instrument
DT-8880 hot-wire anemometer
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Experiment setup
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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
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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
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Considerations of Experiment 1
Blowing → Wind speed is unstable
Inhaling → Relatively stable
↓
We chose to use the inhaling method.
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Experiment 2 Visualization of wind flowModel of car
Videos of the wing model
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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.
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Experiment 3 Why float the wing?
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PredictionWind speed difference is born from the difference in distance above and below the wing
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Experimental method
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Measuring method
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Considerations of Experiment 3
There is a possibility that the wind speed difference causes wings to fly.
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Future prospectsRelationship between
elevation and separation of the air flow
Relationship between elevation and lift
Ideal shape for a wing
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Thank you for listening!