Efficient placement of vertical-axis wind turbines

Hyogo Prefecture, Kakogawa Higashi High School Science & Math Course Science Research Group 2

1

• High power generation

• High noise generation

• Large land area needed

• Low power generation

• Low noise generation

• Small land area needed

Horizontal-axis wind turbine

Vertical-axis wind turbine

https://engoo.com/app/words/word/turbine/ks8rjzLFTau30iYYJyhiyw https://www.es.sus.ac.jp/demae/ 2

Introduction

3

bird's eye view

buildingwind

Introduction

4

3-D Printed vertical-axis wind turbines

Computer Aided Design

(CAD)

clockwise

wind turbine

anticlockwise

wind turbine experimental turbine

3-D Printed

Preliminary experiment 1

5

Measurement

position 1

Electrical power generated by the rear wind turbine

wind

Front turbine

Rear turbine

Preliminary experiment 1

6

Electrical power generated by the rear wind turbine

wind

Measurement

position 2

Front turbine

Rear turbine

Preliminary experiment 1

7

Electrical power generated by the rear wind turbine

wind

Measurement

point 3

Front turbine

Rear turbine

When the front wind turbine turn clockwise,

it increases the wind speed in area (Ⅰ).

Preliminary experiment 1

8

Power generated by the rear wind turbine

fan

wind turbine

When the front wind turbine turn clockwise,

it increases the wind speed in area (Ⅰ).

When the front wind turbine turns anticlockwise,

it increases the wind speed in area (Ⅲ).

Preliminary experiment 1

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Power generated by the rear wind turbine

fan

wind turbine

（１）both spin in the

same direction

（３） both spin outwards（２）both spin inwards

Preliminary experiment 2

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Spin direction of turbines

wind

Preliminary experiment 2

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0

2

4

6

8

10

12

14

16

18

20

both in the

same directionboth spin inward

both spin

outward

[mW

]

Ele

ctr

ical pow

er

genera

ted (

mW

)

Spin direction of turbines

Electrical power generated for each direction of turbine spin

Experiment 1

12

set 1 set 2 set 3

set 5

set 4

vertical diagonal zig zag

V-shaped

inverted V-shaped

wind

5 sets of turbine arrangements

4 turbines per set

Power generation per unit area for each set of turbines

Experiment 1 5 sets of turbine arrangements

vertical zig zag V-shaped Inverted

V-shapeddiagonal

[mW/m2]

13

Pow

er

genera

ted p

er

unit (

mW

/m)

Turbine set

２

Experiment 1 5 sets of turbine arrangements

14

fan

one turbine

4 turbines per set

A B

C D

wind

Experiment 1 5 sets of turbine arrangements

15

fan

one turbine

4 turbines per set

A B

C D

wind

Experiment 1 5 sets of turbine arrangements

16

fan

one turbine

4 turbines per set

A B

C D

wind

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Experiment 2 Kawasaki Heavy Industries’ wind tunnel

Experiment 2 Horizontal formation of set 5

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12 turbines (3×set 5)

A3 B3

C3 D3

A2B2

C2 D2

A1 B1

C1 D1

wind

Observed power generated by different types of separation

distances between turbines

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12 turbines

A3 B3A2 B2A1 B1

wind

A5 A6A4 B6B5B4

Experiment 2 Horizontal straight line formation

31 or 62 or 93[mm]

12 wind turbines (3×set 5)

Experiment 2 separation type 1

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A3 B3C3 D3A2 B2C2 D2A1 B1C1 D1

Type 1: horizontal separation distance between turbines

A-C and D-B within each set.

wind

124 or 155 or 186[mm]

Experiment 2 separation type 2

21

wind

Type 2: horizontal separation distance between turbines

C-D within each set.

C3 D3C2 D2C1 D1

12 wind turbines (3×set 5)

124mm 155mm 186mm

31mm 131.4 114.7 84.9

62mm 164.3 170.9 137.1

93mm 181.3 168.3 151.2

124mm *1

[mW/m]

*1: Unable to measure due to sensor malfunction

Data: Average of 100 measurements

Electrical power generated per unit separation distance

Experiment 2 Results

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31 or 62 or 93[mm]

124 or 155 or 186[mm]

173.5 185.6

horizontal

straight lineone turbine

[mW/m]

・Wind Interference effects from nearby turbineslower the amount of electrical power generated.

・An inverted V-shape (set 5) is the best way to

increase the amount of electrical power generatedper total formation width.

Experiment 2 Analysis and discussion

2393[mm] 124[mm]

・When multiple turbines are placed close together, the electrical power generated decreases.

・The inverted V-shape (set 5) formation generated the highest electrical power per unit separation distance.

Conclusion

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・The inverted V-shape is the most suitable for electrical power generation using building air vortices, as it can generate more power from a smaller area.

Conclusion

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Mr. Oota MasayaOsaka Prefecture University College of SustainableSystem Sciences School of Knowledge and InformationSystems

Mr. Yoshitake Hideto and Mr. Hamada ShinjiKawasaki Heavy Industries, Ltd. Engineering division

Acknowledgements

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1. Shigetomi akinari, murai yuichi, tasaka yuji, takeda yasushi “mutual interference between each savonius wind turbines under the condition the arrangement of horizontally”, the latest speech & article of the power & energy technology：symposium 2009.14(0),45-

46,2009 general incorporated association, the japan society of mechanical engineers

2. Murai yuichi, oda tomorou, oishi yoshihhiko, tasaka yuji ”wind tunnel model experiments on interaction among horizontally arranged VAWTs” the latest speech & article of the power & energy technology ：symposium 2013.18(0),29-30,2013 general incorporated

association, the japan society of mechanical engineers

3. Kitai atsuya, shino hiroaki, tanaka yumi, fujimoto yudai, miura taishi kakogawahigashi high school（2017）the efficiency of private

wind turbines with different aspect ratios”Kajimoto syota, kono tomoki, tabe humiki, Tsuda shuto, miyamoto ken, yamawakikaisei kakogawahigashi high school（2019）”improving the efficiency of vertical axis wind turbines “

4. Robert W Whittlesey1, Sebastian Liska1 and John O Dabiri1,2 ”Fish schooling as a basis for vertical axis wind turbine farm design 1” Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena CA 91125, USA 2 Option inBioengineering, California Institute of Technology, Pasadena CA 91125, USA, October 29, 2018

References

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Thank you for listening.

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風車を固定する土台

width：450mm

length：600mm

diameter：26mm

distance betweentwo holes：5mm

M

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D

C

B

A

10 11 12 13 14 15 16 171 2 3 4 5 6 7 8 9

W

i

n

d

Instrument

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width

length

windspeed

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→1~13、C~I

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F

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D

C

B

A

10 11 12 13 14 15 16 171 2 3 4 5 6 7 8 9

風

windspeed

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result（１） both spin in

the same direction（３） both spin outwards（２） both spin inwards

average of 150 data

Preliminary survey②

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31mm 31mm31mm

62mm 62mm62mm

93mm 93mm93mm

１

２

３

４

５

６ ７

８ ９

？[mm]

Future prospects

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Future prospects

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wind

Power generation per length

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Evaluation Method

124[mm]

diameter:100[mm]

24[mm]

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Evaluation Method

unit:mm

wind

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fan

tunnel

Preliminary experiment 1

3.4 6.3 4.4 6.8 0.9

12.0 6.2 6.3 2.1

2.5 5.7 6.2 2.5

wind

[m/s]

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Preliminary experiment 1

wind wind

windwind

20.0

15.0

10.0

5.0

0.0 [mA]

first：clockwise

second：out clockwise

same direction

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Preliminary experiment 1

wind wind

windwind

opposite direction

20.0

15.0

10.0

5.0

0.0 [mA]

41

first：clockwise

second：out clockwise

Preliminary experiment 1

INA226

Raspberry Pi

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Single board computer and sensor

？ ？

Research the most efficient formation length between each turbines

Future prospects

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service-l02.jpg (205×444) (wind-hope.co.jp)

Wind lens

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Comparing inward with outward

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Preliminary survey②