|
Impeller
image
courtesy of
P. Csiszar |
The PBT is a generic impeller design. It is a 4-bladed turbine with 45o pitched blades. Blade
width is 0.2 times its swept diameter. The PBT has long been considered an
axial flow impeller. That really depends on its D/T. For small
D/T, the PBT is an axial flow impeller. For very large D/T, the PBT
is almost a radial flow impeller. A 3-bladed PBT with 30o pitched
blades is almost as axial as a hydrofoil. In Europe, the 6-bladed
version of the PBT is more common.
Turbulent Power Number Np=1.27,
Flow Number Nq=0.79
|
 |
| Re |
Np |
Nq |
theta N |
discharge angle |
Notes |
| 1 |
|
|
|
90 deg |
T = 17.5"
Z = 12.0", Z/T = 0.69
D = 6.0", D/T = 0.34
OB = 3.0", OB/D = 0.5
4 baffles
Fluids: 96% Glycerine and Carbopol |
| 10 |
|
|
10000 |
90 |
| 30 |
|
|
1300 |
80 |
| 100 |
|
|
400 |
75 |
| 300 |
|
|
65 |
50 |
| 1000 |
|
|
17 |
45 |
| 3000 |
|
|
|
45 |
| 10000 |
|
|
|
45 |
| turbulent |
1.26 |
0.79 |
|
45 |
Reference The data above was
extrapolated from graphs in the reference.
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