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!