Environmental Engineering Reference
In-Depth Information
Figure 5-10. Flow velocity diagram at an annulus in a HAWT rotor disk.
Table 5-2.
Flow Conditions and Rotor Parameters for the Glauert Optimum HAWT Rotor
Velocity
ratio
Axial
induction
factor
a
Rotational
induction
factor
a
ยข
Relative
inflow
angle
f
(deg)
Rotor
power
coefficient
C
p, r
Blade-
element
parameter
Bc
W
C
L
/ 2
p
U
x
0.25
0.280
1.364
50.6
0.176
0.3658
0.50
0.298
0.543
42.3
0.289
0.5205
0.75
0.310
0.294
35.4
0.364
0.5552
1.00
0.317
0.183
30.0
0.416
0.5359
1.25
0.322
0.124
25.8
0.451
0.4974
1.50
0.324
0.089
22.5
0.477
0.4551
1.75
0.326
0.067
19.8
0.496
0.4151
2.00
0.328
0.052
17.7
0.511
0.3791
2.50
0.330
0.034
14.5
0.532
0.3200
3.00
0.331
0.024
12.3
0.545
0.2750
3.50
0.331
0.018
10.6
0.555
0.2403
4.00
0.332
0.014
9.4
0.562
0.2129
4.50
0.332
0.011
8.4
0.566
0.1909
5.00
0.332
0.009
7.5
0.570
0.1729
5.50
0.332
0.007
6.9
0.573
0.1580
6.00
0.333
0.006
6.3
0.576
0.1453
7.00
0.333
0.004
5.4
0.580
0.1252
8.00
0.333
0.004
4.8
0.582
0.1099
9.00
0.333
0.003
4.2
0.584
0.0979
10.00
0.333
0.002
3.8
0.585
0.0883
11.00
0.333
0.002
3.5
0.586
0.0803
12.00
0.333
0.002
3.2
0.587
0.0737
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