臺灣博碩士論文加值系統

本實驗研究的對象為單一圓柱尾流，再以流體動量干擾此尾流場。在本實驗中流體動量激擾圓柱尾流區的方式，包括有:未注入動量、穩定噴出動量、往復噴吸動量及穩定吸入動量之圓柱後尾流流場分析。本實驗探討分析在不同雷諾數(Re=800-4000)下之噴吸方式對流體於圓柱尾流的頻率效應、振幅效應及不同噴入動量方式對尾流場的影響，以產生建設性或破壞性干涉，達到控制圓柱後尾流流場。在此將藉由實驗所得之結果，深入探討流體對尾流的影響，大致包括渦漩結構的大小、速度分佈快慢、紊流強度及主要頻率呈現的變化，與判斷在不同噴吸頻率下與其流場產生的特徵頻率，以及給定以不同噴吸動量之大小方式分析圓柱尾流渦漩及剝離過程對流場造成之影響，並對其尾流流場結構進行可視化分析及影像邊緣化，以此探討流體噴入或吸入對圓柱尾流的影響。

This experiment is to investigate the effects of fluid with and without mass injection through a slit on the vortex shedding from a single cylinder. We research Reynolds Numbers on ranges from 800 to 4000. We used four kinds of ways which contain no mass injection, steady blowing, steady suction and oscillatory jet to study of the wake behind a circular cylinder under excitation in this experiment. No mass injection is measured for the sake of its reliability and comparability of experiment. Steady blowing and suction are applied to influence the wake flow. An oscillatory jet is used to influence the wake flow with varying frequencies and amplitudes. The experiment looks forward to use the results of this experiment so as to research into the effects on the wake flow, including the velocity values of fluctuation and turbulence intensity of the vortices structure, the dominant frequency in the flow pattern on a single cylinder. The main parameters in the study are the frequency, momentum and the location of the blowing and suction jet, which are a steady jet or unsteady oscillatory jet. Flow visualization has been carried out to investigate the interaction of steady or unsteady fluid perturbation and the vortex shedding of a cylinder.

摘要 Ⅰ
Abstract Ⅱ
目錄 Ⅲ
圖目錄 Ⅵ
表目錄 XV
符號說明 XⅥ
第一章 緒論 1

1-1 前言 1
1-2 文獻回顧 2
● 圓柱渦漩流場 3
● 控制渦漩剝離 5
● 圓柱尾流場量測 6
1-3研究動機與目的 8
第二章 實驗設備、儀器與方法 9
2-1 實驗設備 9
2-1-1 水循環系統之設備 9
2-1-2 測試段 10
2-1-3 動量注入尾流系統 11
2-1-4 流場可視化系統於雷射光頁煙線流場觀察 15
2-2 實驗儀器 16
2-2-1 流場影像擷取系統 16
2-2-2 流速量測系統 17
2-2-3 訊號擷取系統 19
2-3 實驗不準度 20
2-4 實驗方法 20
第三章 實驗結果與討論 23
3-1 未注入動量之圓柱後尾流流場分析 23
3-2 穩定注入動量之圓柱後尾流流場分析 25
3-3 往復注入動量之圓柱後尾流流場分析 28
3-4 穩定吸入動量之圓柱後尾流流場分析 32
第四章 結論與建議 35
4-1 結論 35
4-2 建議 37
參考文獻 38

Blevins,R.D. 1990, "Flow-Induce Vibration", Second Edition,Van Nostrand Reinhold.Chyu,C.K. and Rockwell,D., 1996, "Near-Wake Structure of an Oscillating Cylinder: Effect of Controlled Shear-Layer Vortices," Journal of Fluid Mechanics, Vol.322, pp.21-40.Cimbala,J.M. and Park,W.J., 1990, "Experimental Investigationof the Turbulent Structure in the Wake of a Two-Dimensional Airfoil," Journal of Fluid Mechanics, Vol.213, pp.479-509.Fujisawa,N., Kawaji,Y. and Ikemoto,K., 2001, "Feedback Control of Vortex Shedding from a Circular Cylinder by Rotational Oscillation", Journal of Fluids and Structures, Vol.15,pp.23-37.Green,R.B. and Gerrard,J.H., 1993, "Vorticity Measurements in the Near Wake of a Circular Cylinder at Low Reynolds Numbers." Journal of Fluid Mechanics, Vol.246, pp.675-691.Gopalkrishnan,R., Triantafyllou,M.S., Triantafyllou, G.S. and Barrett,D., 1994, "Active Vorticity Control in a Shear Flow Using a Flapping Foil," Journal of Fluid Mechanics, Vol.274, pp.1-21.Gunzburger,M.D. and Lee,H.C., 1996, "Feedback Control of Karman Vortex Shedding, " , Journal of applied mechanics, Transactions of the ASME, Vol.63, pp.828-835.Gursul,I., Srinvas,S. and Batta,G., 1995, "Active Control of Vortex Breakdown over a Delta Wing," AIAA Journal,Vol.33, pp.1743-1745.Igarashi,T. and Itoh,S., 1993, "Drag Reduction of a Square Prism (1st Report, Flow Control around a Square Prism Using a Small Vortex Shedder)," Transactions of JSME, Vol.59, pp.3701-3707.Kazuyuki Fujimura, Hiroaki Yoshizawa, Reima Iwatsu, Hide S. Koyama, and Jae Min Hyun, 2001, "Velocity Measurements of Vortex Breakdown in an Enclosed Cylinder," Journal of Fluids Engineering, Transactions of the ASME, Vol.123, pp. 604-611.Lee,S.J. and Kim,H.B., 1996, "Effect of Surface Protrusions on the near Wake of a Circular Cylinder," Journal of Wind Engineering and Industrial Aerodynamics Progress in Bluff Body Aerodynamics Proceedings of the 1996 3rd International Colloquium on Bluff Body Aerodynamics and Applications Jul 28-Aug 1, Vol.69-71, pp.351-361.Lienhard,J.H., 1966 "Synopsis of Lift, Drag and Vortex Frequency Data for Rigid Circular Cylinders," Washington State University, College of Engineering, Research Division Bulletin pp.300. Modi,V.J., Dobric,A. and Yokomizo,T., 1993, "Effect of Momentum Injection on the Fluid Dynamics of Bluff Bodies," Proceedings of the Third (1993) International Offshore and Polar Engineering Conference, Part 3 (of 4) Jun 6-11, 1993 Singapore, pp.501-513.Munshi,S.R., Modi,V.J. and Yokomizo,T., 1996, "Effect of Momentum Injection on the Drag Reduction and Flow-Induced Instabilities of a Square Prism," International Journal of Offshore and Polar Engineering, Vol.6, No.3, pp.161-170.Munshi,S.R., Modi, V.J. and Yokomizo, T., 1997, "Aerodynamics and Dynamics of Rectangular Prisms with Momentum Injection," Journal of Fluids and Structures, Vol.11, pp.873-892.Munshi,S.R., Modi,V.J., and Yokomizo,T., 1998, "Drag Reduction and Vibration Control of a Spar-Type Cylindrical Structure through Boundary-Layer Control," Proceedings of the International Offshore and Polar Engineering Conference Proceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4) May 24-29 , Vol.3, 1998 Montreal, pp.415-423.Sahjendra N. Singh, James H. Myatt, Gregory A. Addington, Siva Banda, and James K. Hall, 2001, "Optimal Feedback Control of Vortex Shedding Using Proper Orthogonal Decomposition Models," Journal of Fluids Engineering, Transactions of the ASME, Vol.123, pp.612-618.Sakamoto,H., Tan,K. and Haniu,H., 1991, "An Optimum Suppression of Fluid Forces by Controlling a Shear Layer Separated form a Square Prism," Journal of Fluids Engineering, Transactions of the ASME, Vol.113, pp.183-189.Sakamoto,H. and Haniu,H., 1994, "Optimum Suppression of Fluid Forces Acting on a Circular Cylinder," Journal of Fluids Engineering, Transactions of the ASME, Vol.116, pp.221-222.Sakamoto,H., Tan,K., Takeuchi,N. and Haniu,H., 1997, "Suppression of Fluid Forces Acting on a Square Prism by passive Control," Journal of Fluids Engineering, Transactions of the ASME, Vol.119, pp.506-511.Strykowski,P.J., and Sreenivasan,K.R., 1985, "The Control of Vortex Shedding behind Circular Cylinder at Low Reyolds Numbers", Proceeding of 5th Symp. on Turbulent Shear Flows, Cornell University. Strykowski,P.J., and Sreenivasan,K.R., 1990, "On the Formation and Suppression of Vortex Shedding at Low Reynolds Numbers," Journal of Fluid Mechanics, Vol.218, pp.71-107. Strouhal,V., 1878 "Uber enie Besondere Art der Tonerregung," Annalen der Physik und Chemie(Leipzig), pp.217-251.Tang,S., 2000, "Suppression of Vortex Shedding Inspired by a Low-Dimensional Model," Journal of Fluids and Structures, Vol.14, pp.443-468.Tao,J.S. and HUANG,X.Y., 1996, "A Flow Visualization Study on Feedback Control of Vortex Shedding from a Circular Cylinder," Journal of Fluids and Structures, Vol.10, pp.965-970.Tennekes,H. and Lumle,J.L., 1972, "A First Course in Turbulence," The MIT Press Cambridge, Massachusetts, and London, England Tomboulides,A.G., 1993, "Direct and Large-Eddy Simulation of Wake Flows: Flow Past a Sphere ," Ph.D. Thesis, Department of Mechanical and Aerospace Engineering, Princeton University.Von Karman,T., 1912, "Uber den Mechanismuss des Windersstandes den ein bewegter Korper in einen Flussigkeit Erfahart," Nachrichten der K. Gesellschaft der Wissenschaften zu Gottingen, pp.547-556. Weaver,D.S., and El-Kashlan,M., 1981, "On the Number of Tube Rows Required to Study Cross-flow Induced Vibrations in Tube Banks," Journal of Sound and Vibration, Vol.75, pp.265-273.Yannick Delaunay and Lambros Lambros Kaiktisis, 2001, "Control of Cylinder Wakes Using Base Mass Transpiration," Physics of Fluids, Vol.13, pp.3285-3302.