Table 1 BEM calculations for the airfoil.

From: Investigation of the performance of a horizontal-axis dual rotor wind turbine

S

\({r}_{i}\) (m)

\({\lambda }_{r,i}\)

\(U_{blade}\, \left( {\frac{{{\text{m}}^{2} }}{{\text{s}}}} \right)\)

\({W}_{rel}\,\left({\frac{{{\text{m}}}}{{\text{s}}}}\right)\)

\({\varnothing }_{i}\,({\text{deg}})\)

\({\propto }_{design}\,({\text{deg}})\)

\({\beta }_{i}\)

Chord \({C}_{i}\,\left({\text{m}}\right)\)

1

0.011

0.038

0.283

7.555

58.568

6

52.568

0.035

2

0.034

0.113

0.647

7.578

55.721

6

49.721

0.095

3

0.056

0.188

1.078

7.627

52.92

6

46.92

0.144

4

0.079

0.263

1.509

7.699

50.194

6

44.194

0.183

5

0.101

0.338

1.941

7.795

47.567

6

41.567

0.212

6

0.124

0.413

2.372

7.914

45.056

6

39.056

0.234

7

0.146

0.488

2.803

8.054

42.674

6

36.674

0.25

8

0.169

0.563

3.234

8.214

40.428

6

34.428

0.26

9

0.191

0.638

3.666

8.393

38.322

6

32.322

0.266

10

0.214

0.713

4.097

8.59

36.353

6

30.353

0.268

11

0.236

0.788

4.528

8.804

34.52

6

28.52

0.268

12

0.259

0.863

4.959

9.033

32.815

6

26.815

0.266

13

0.281

0.938

5.391

9.277

31.232

6

25.232

0.263

14

0.304

1.013

5.822

9.534

29.763

6

23.763

0.258

15

0.326

1.088

6.253

9.803

28.4

6

22.4

0.253

16

0.349

1.163

6.684

10.084

27.135

6

21.135

0.247

17

0.371

1.238

7.116

10.375

25.961

6

19.961

0.241

18

0.394

1.313

7.547

10.675

24.869

6

18.869

0.235

19

0.416

1.388

7.978

10.984

23.854

6

17.854

0.229

20

0.439

1.463

8.41

11.301

22.909

6

16.909

0.223

21

0.461

1.538

8.841

11.626

22.027

6

16.027

0.217

22

0.484

1.613

9.272

11.957

21.204

6

15.204

0.211

23

0.506

1.688

9.703

12.295

20.434

6

14.434

0.205

24

0.529

1.763

10.135

12.638

19.713

6

13.713

0.2

25

0.551

1.838

10.566

12.986

19.037

6

13.037

0.194

26

0.574

1.913

10.997

13.339

18.403

6

12.403

0.189

27

0.596

1.988

11.428

13.697

17.806

6

11.806

0.184

28

0.619

2.063

11.86

14.059

17.244

6

11.244

0.179

29

0.641

2.138

12.291

14.425

16.715

6

10.715

0.175

30

0.664

2.213

12.722

14.794

16.215

6

10.215

0.17

31

0.686

2.288

13.153

15.166

15.742

6

9.742

0.166

32

0.709

2.363

13.585

15.542

15.295

6

9.295

0.162

33

0.731

2.438

14.016

15.92

14.871

6

8.871

0.158

34

0.754

2.513

14.447

16.301

14.469

6

8.469

0.154

35

0.776

2.588

14.878

16.684

14.087

6

8.087

0.15

36

0.799

2.663

15.31

17.07

13.724

6

7.724

0.147

37

0.821

2.738

15.741

17.458

13.378

6

7.378

0.144

38

0.844

2.813

16.172

17.848

13.049

6

7.049

0.14

39

0.866

2.888

16.603

18.239

12.735

6

6.735

0.137

40

0.889

2.963

17.035

18.633

12.435

6

6.435

0.134

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