EFFECT OF WIND TUNNEL BLOCKAGE ON AERODYNAMICS OF CIRCULAR CYLINDERS
Pages: 1 - 14
|
|
Participants:
SAIB ABDULLA YOUSIF |
Summary:
Experimental investigation was conducted on low speed wind tunnel with (50 mm
xl 00 mm) rectangular working section. Five smooth circular cylinders, as bluff
bodies were applied. Cylinders diameters are 12.5, 15, 17, 35, and 37 mm which
experience blockage ratio of 12.5%, 15%, 17%, 35%, and 37%, respectively. The
range of Reynolds No. and air velocity for present study is 0. 7 x 104
- 5x104 and 10-
20 mis respectively which are more applicable in engineering field. The experiments
were carried out in fluid mechanics laboratory, Faculty of engineering and
technology, Sebha University, Libya. Results indicate that cylinders of blockage ratio
of 35% and 37% experience lower pressure coefficients around bodies, lower velocity
distribution in the wake, and higher drag coefficients. Drag coefficient correction is
agreed with unconfined flow for blockage ratio less than 17%. Wake and buoyancy
blockages may have effect on models of higher blockage ratios.