Please use this identifier to cite or link to this item:
標題: 縱列雙鈍體間自激式流場之實驗探討
Experimental Investigation on Self-Excited Flow between Two Tandem Bluff Bodies
作者: 謝宏杰
Hsieh, Hung-Chieh
關鍵字: tandem;縱列;bluff body;self-excited;Wavelet transformation;鈍體;自激式振盪;小波分析法
出版社: 機械工程學系所
引用: 參 考 文 獻 1. Gu, Z., “on Interference between Two Circular Cylinders at Supercritical Reynolds Numbers”, Journal of Wind Engineering and Industrial Aerodynamics, 1996, Vol. 62, pp.175-190。 2. Jeste, W. and Kallinderis, Y., “Numerical Study of Incompressible Flow about Fixed Cylinder Pairs”, Journal of Fluids and Structures, 2003, Vol. 17, pp.561-577。 3.Lin, C., Hsieh, S.C., Chang, K.T., “The Formation Length and Convection Velocity of Vortex Structure in The Near Wake of A Circular Cylind”, Proceedings of The Fifth International Conference on Hydrodynamics , 2002, pp.245-249。 4. Mittal, S., Kumar, V., Raghuvanshi, A., “Unsteady Incompressible Flows Past Two Cylinders in Tandem and Staggered Arrangements”, International Journal for Numerical Methods in Fluids, 1997, Vol. 25, pp.1315 ~ 1344。 5. Ozono, S., “ Vortex Suppression of The Cylinder Wake by Deflectors”, Journal of Wind Engineering and Industrial Aerodynamics, 2003, Vol. 91, pp.91~99。 6. Ozono, S., “Flow Control of Vortex Shedding by A Short Splitter Plate Asymmetrically Arranged Downstream of A Cylinder”, Physics of Fluids, 1999, Vol. 11, No. 10, pp. 2928~2934。 7. Sakamoto, H. and Alam Mahbub, Md., “Investigation of Strouhal Frequencies of Two Staggered Bluff Bodies and Detection of Multisable Flow by Wavelets”, Journal of Fluids and Structures, 2005, Vol. 20, pp.425-449。 8. Sakamoto, H., Alam Mahbub, Md., Moriya, M., Takai, K., “Fluctuating Fluid Forces Acting on Two Circular Cylinders in A Tandem Arrangement at A SubcriticalReynolds Number”, Journal of Wind Engineering and Industrial Aerodynamics, 2003, Vol. 91, pp.139 ~154。 9. Sharman, B., Lien, F. S., Davidson, L., Norberg, C., “Numerical Predictions of Low Reynolds Number Fows over Two Tandem Circular Cylinders”, International Journal for Numerical Methods in Fluids, 2005, Vol. 47, pp.423 ~ 447。 10. Sumner, D., Price, S. J., Paidoussis, M. P., “Flow-Pattern Identification for Two Staggered Circular Cylinders in Cross-Flow”, Journal of Fluid Mechanics, 2000, Vol. 411, pp.263-303。 11. Sumner, D. and Richards, M.D., “Some Vortex-Shedding Characteristics of The Staggered Configuration of Circular Cylinders”, Journal of Fluids and Structures, 2003, Vol. 17, pp.345-350。 12. Sumner, D. and Akoile, O.O., “Staggered Circular Cylinders Immersed in A Uniform Planar Shear Flow”, Journal of Fluids and Structures, 2003, Vol. 18, pp.613-633。 13. Sumner, D., Richards, M.D., Akoile, O.O., “Two Staggered Circular Cylinders of Equal Dimeter in Cross-Flow”, Journal of Fluids and Structures, 2005, Vol. 20, pp. 255-276。 14. Zdravkovich, M.M., “Review of Interference-Induced Oscillations in Flow Past Two Parallel Circular Cylinders in Various Arrangements”, Journal of Wind Engineering and Industrial Aerodynamics, 1988, Vol.28, pp.183-200。 15.簡賢明, “縱列與錯列雙圓柱尾流結構之實驗分析”, 國立中興大學, 機械工程研究所碩士論文, 2002。 16.陳信安, “以小波方法分析並列雙圓柱尾流場所定特性”, 國立中興大學機械研究所碩士論文, 2004。 17.陳建章, “雙控制圓柱對於主要圓柱尾流幹擾之數值研究”, 國立中興大學, 機械工程研究所碩士論文, 2005。
摘 要

This study investigates the self-excited flow characteristics between two tandem bluff bodies with different bluff body arrangements and various streamwise spacings. The Reynolds numbers studied are 1000 and 2000. The experiments are performed in a low-speed recirculation water channel. Qualitative flow structures were observed by the dye flow visualization, and the quantitative velocity measurements were performed by the PIV technique and the FLDV system, respectively. The phase information are calculated from two simultaneously measured velocity signals from FLDV and hot-film anemometer and are analyzed by cross Wavelet transformation. Further, utilizing particle image velocimetry system acquires the instantaneous and the average voritcity distribution of the self-excited flow structures between two
tandem bluff bodies.
It is found that: (1)occurrence of the self-excited flow between two tandem bluff bodies depend strongly upon: the Reynolds number, the streamwise spacing between two tandem bluff bodies, the vortex formation length of the single upstream bluff body, and the characteristic length of the downstream bluff body.(2)The flow characteristics between two bluff bodies includes smooth separated shear layer across the downstrem bluff body, the sustained self-excited flow, one vortex streets, and an intermittently changing flow characteristics between the self-excited flow structure and the shedding vortex street.(3)The self-excited flow characteristics is found between two bluff bodies, but the details are never discussed. The experiment finds the self-excited flow characteristics between two bluff bodies is a stable sustained
self-excited oscillatory flow structure.
其他識別: U0005-2601200712273300
Appears in Collections:機械工程學系所

Show full item record

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.