This paper presents a detailed investigation of Strouhal frequencies, forces and flow structures resulting from the interference between two tandem cylinders of different diameters. The upstream cylinder diameter (d) was varied from 25 mm to 6 mm, while the downstream cylinder diameter (D) of 25 mm was unchanged, the corresponding diameter ratio, d/D, being 1.0 ∼ 0.24. The spacing between the cylinders was 5.5d. At this spacing, the shear layers separated from the upstream cylinder roll up alternately, forming a vortex street in the gap between and behind the cylinders. Two dominant frequencies are detected behind the downstream cylinder at d/D = 1.0 ∼ 0.4. One is the same as detected between the cylinders, and the other is of relatively low frequency and is probably generated by the downstream cylinder. Whilst the former remains unchanged, the latter increases with decreasing d/D, due to an increase in the incident flow velocity of the downstream cylinder. The time-averaged drag on the downstream cylinder also increases with decreasing d/D, though the fluctuating forces drop because vortices impinging upon the downstream cylinder are impaired by decreasing d/D.
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ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
July 23–27, 2006
Vancouver, BC, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-47888
PROCEEDINGS PAPER
Interference Between Two Tandem Cylinders of Different Diameters
Md. Mahbub Alam,
Md. Mahbub Alam
Hong Kong Polytechnic University, Hong Kong, China
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Y. Zhou
Y. Zhou
Hong Kong Polytechnic University, Hong Kong, China
Search for other works by this author on:
Md. Mahbub Alam
Hong Kong Polytechnic University, Hong Kong, China
Y. Zhou
Hong Kong Polytechnic University, Hong Kong, China
Paper No:
PVP2006-ICPVT-11-93832, pp. 397-406; 10 pages
Published Online:
July 23, 2008
Citation
Mahbub Alam, M, & Zhou, Y. "Interference Between Two Tandem Cylinders of Different Diameters." Proceedings of the ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. Volume 9: 6th FSI, AE and FIV and N Symposium. Vancouver, BC, Canada. July 23–27, 2006. pp. 397-406. ASME. https://doi.org/10.1115/PVP2006-ICPVT-11-93832
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