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標題: 具有小間距的不等直徑錯列圓柱下游流場特性之研究
Study on Flow Characteristics behind Staggered Cylinders of Unequal Diameter at Small Gap
作者: 許尚文
Hsu, Shang-Wen
關鍵字: 間隙流;gap flow;錯列雙圓柱;渦旋;不等直徑;staggered cylinder;vortex;unequal diameter
出版社: 機械工程學系所
引用: 1. Spivack, H.M., Vortex frequency and flow pattern in the wake of two parallel cylinders at varied spacing normal to an airstream, 1945, Catholic University of America. 2. Bloor, M.S., The transition to turbulence in the wake of a circular cylinder. Journal of Fluid Mechanics, 1964. 19(02): p. 290-304. 3. Zdravkovich, M., Review of flow interference between two circular cylinders in various arrangements. ASME Transactions Journal of Fluids Engineering, 1977. 99, p. 618-633. 4. Kiya, M., et al., Vortex shedding from two circular cylinders in staggered arrangement. Journal of Fluids Engineering, 1980. 102: p. 166. 5. Williamson, C. H. K. , Evolution of a single wake behind a pair of bluff bodies. Journal of Fluid Mechanics, 1985. 159, p. 1-18. 6. Sumner, D., Wong, S. S. T., and Price, S. J., Fluid behaviour of side-by-side circular cylinders in steady cross-flow. Journal of Fluids and Structures, 1999.13, p. 309-338. 7. Sumner, D., S. Price, and M. Paidoussis, Flow-pattern identification for two staggered circular cylinders in cross-flow. Journal of Fluid Mechanics, 2000. 411(1): p. 263-303. 8. Xu, S., Y. Zhou, and R. So, Reynolds number effects on the flow structure behind two side-by-side cylinders. Physics of Fluids, 2003. 15: p. 1214. 9. Zhao, M., Cheng, L., Teng, B., Liang, D., Numerical simulation of viscous flow psst two circular clinder of different diameters. Applied Ocean Research, 2004. p 1-17 10 Akilli, H., A. Akar, and C. Karakus, Flow characteristics of circular cylinders arranged side-by-side in shallow water. Flow Measurement and Instrumentation, 2004. 15(4): p. 187-197. 11. Wang, Z. J. and Zhou, Y., Vortex interactions in a two side-by-side cylinder near-wake. International Journal of Heat and Fluid Flow, 2005. 26, p. 362-377. 12. Hu, J. and Y. Zhou, Flow structure behind two staggered circular cylinders. Part 1. Downstream evolution and classification. Journal of Fluid Mechanics, 2008. 607: p. 51-80. 13. Gao, Y., et al., Experimental study on the near wake behind two side-by-side cylinders of unequal diameters. Fluid dynamics research, 2010. 42(5): p. 055509. 14. 李宜儒,運用小波方法分析並列雙圓柱尾流的長時間特性,中興大學機械工 程系 碩士論文, 2005. 15. 張修豪,具有兩倍直徑比之錯列圓柱下游流場特性之研究,中興大學機械工 程系 碩士論文, 2010. 16. Roshko, A., On the development of turbulent wakes from vortex streets. 1954.
本論文利用質點影像測速系統(PIV)、流場可視化、以及快速傅立葉轉換(FFT)來進行流場結構及特性分析,探討當雷諾數為1000時,具有直徑比為1、2、4之錯列圓柱下游之流場結構及能量消長變化。其中,錯列雙圓柱之垂直間距固定為G/D=0.25,水平間距為L/D=-3.5~3.5。研究結果顯示:在D/d=1時,沒有mode 1和mode 2之分別。當D/d=1、-3.5≦L/D≦-2.0與2.0≦L/D≦3.5均屬於渦旋A+B+C型流場,在更下游處,A、B、C渦旋結合成一大尺度渦旋再脫離。當D/d=1、-2.0
This study investigates the flow characteristics using Particle Image Velocimetry (PIV), Laser Doppler measurement system (LDV), flow visualization and fast Fourier transform (FFT). The Reynolds number is 1000, and the diameter ratios of staggered cylinders are 1.0, 2.0 and 4.0. The staggered cylinders are arranged at same gap ratio (G/D=0.25) with varying horizontal spacing within -3.5≤L/D≤3.5. For D/d=1, the modes 1 and 2 are exact mirror image of each other. For D/d=1, -3.5≦L/D≦-2.0 and 2.0≦L/D≦3.5, the vortices A, B, C merge into a large vortex in the downstream region. For -2.0
其他識別: U0005-2308201311170700
Appears in Collections:機械工程學系所

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