Flow over a Magnetically Suspended Cylinder in an Axial Free Stream
Flow over a Magnetically Suspended Cylinder in an Axial Free Stream
Flow over a Magnetically Suspended Cylinder in an Axial Free Stream
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80<br />
u/U<br />
65<br />
50<br />
35<br />
20<br />
5<br />
z(mm)<br />
-10<br />
-25<br />
-40<br />
-55<br />
-70<br />
1.00 -1.02<br />
0.98 -1.00<br />
0.96 -0.98<br />
0.94 -0.96<br />
0.92 -0.94<br />
0.90 -0.92<br />
0.88 -0.90<br />
0.86 -0.88<br />
0.84 -0.86<br />
0.82 -0.84<br />
0.80 -0.82<br />
-85<br />
-70<br />
-55<br />
-40<br />
-25<br />
-10<br />
5<br />
20<br />
35<br />
50<br />
65<br />
80<br />
-85<br />
y(mm)<br />
Figure 3 Me<strong>an</strong> axial velocity (u/U) distribution <strong>in</strong> the wake of the 45mm diameter cyl<strong>in</strong>der,<br />
L/D=5.02 at x/D= 6.11 (Re D =100,000)<br />
1.05<br />
1.00<br />
0.95<br />
y traverse<br />
y traverse (mirror image)<br />
z traverse (mirror image)<br />
z traverse<br />
u/U<br />
0.90<br />
0.85<br />
0.80<br />
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0<br />
y/D or z/D<br />
Figure 4 Me<strong>an</strong> velocity profiles along 2 axes <strong>in</strong> the wake<br />
a 45mm diameter L/D=5.02 axial cyl<strong>in</strong>der at x/D= 6.11<br />
The streamwise variation of the me<strong>an</strong> velocity <strong>in</strong> the wake was measured beh<strong>in</strong>d the 25mm diameter cyl<strong>in</strong>der<br />
with a s<strong>in</strong>gle hot wire probe, <strong>an</strong>d the results are shown <strong>in</strong> Fig. 5. When the virtual orig<strong>in</strong> of the wake was taken to be<br />
1.3D downstream of the trail<strong>in</strong>g edge, the velocity defects shown <strong>in</strong> Figs. 4 <strong>an</strong>d 5 followed the established x^(-1/3)<br />
law for axisymmetric wakes.<br />
1.0<br />
u/Uma<strong>in</strong><br />
0.8<br />
0.6<br />
0.4<br />
z=1mm<br />
x=0.04D<br />
x=2D<br />
x=4D<br />
x=10D<br />
0.2<br />
0.0<br />
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0<br />
y/D<br />
Figure 5.<br />
Velocity distributions across the wake of 25mm diameter cyl<strong>in</strong>der (L/D=6)<br />
- 4 –<br />
Americ<strong>an</strong> Institute of Aeronautics <strong>an</strong>d Astronautics