T. Zhou and S. F. Mohd. Razali and Y. Zhou and H. Wang and L. Cheng
PhaseAveraged Analysis of ThreeDimensional Vorticity in the Wake of Two Yawed SideBySide Circular Cylinders
27 - 36
2014
8
1
International Journal of Mechanical and Mechatronics Engineering
https://publications.waset.org/pdf/9997036
https://publications.waset.org/vol/85
World Academy of Science, Engineering and Technology
Thewake flow behind two yawed sidebysidecircular
cylinders is investigated using athreedimensional vorticity probe.
Four yaw angles (&alpha;), namely, 0&deg;, 15&deg;, 30&deg; and 45&deg; and twocylinder
spacing ratios T
of 1.7 and 3.0 were tested. For T
3.0, there exist
two vortex streets and the cylinders behave as independent and
isolated ones. The maximum contour value of the coherent streamwise
vorticity &omega;x
is only about 10 of that of the spanwise vorticity &omega;z
.
With the increase of &alpha;,
&omega;x
increases whereas &omega;z
decreases. At &alpha;
45&deg;, &omega;x
is about 67 of &omega;z
.For T 1.7, only a single peak is
detected in the energy spectrum. The spanwise vorticity contours have
an organized pattern only at &alpha; 0&deg;. The maximum coherent vorticity
contours of &omega; x
and &omega;z
for T
1.7 are about 30 and 7 of those
for T
3.0.The independence principle (IP)in terms of Strouhal
numbers is applicable in both wakes when &alpha;&lt; 40&deg;.
Open Science Index 85, 2014