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


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