本論文的研究目的為設置圓管噴流組件應用於探討圓管噴流實驗，與使用質點影像速度儀(PIV)方法和質點軌跡速度儀(PTV)方法計算直立式水洞對應之垂直流速。實驗進行在不干擾流場下進行全域流場的速度量測，實驗使用三具半導體綠光雷射經由光頁產生裝置(玻棒)將雷射光頁照射入直立式水洞之測試段中，並在直立式水洞之上方水槽加入大量質點，質點經由雷射光頁照射能產生散射，因為質點密度與水相當接近，所以可將懸浮質點視為流體質點。本研究工作調整直立式水洞變頻器的頻率調整馬達的運轉速度，並且使用高速攝影機記錄流場影像。在同解析度下，擷取的連續影像，首先使用目視估算流場的方法計算流場速度，接著使用質點影像速度儀(PIV)方法和質點軌跡速度儀(PTV)方法來計算流場速度，將以上三者計算的結果加以比較，可得知流場速度在低速(2Hz到10Hz)時，質點影像速度儀(PIV)方法計算的速度變異範圍在8%以內，質點軌跡速度儀(PTV)方法計算的速度變異範圍在4%以內；流場速度在高速(11Hz到30Hz)時，質點影像速度儀(PIV)方法計算的速度變異範圍在8%以內，質點軌跡速度儀(PTV)方法則無法計算出流場速度。PIV計算方法與PTV計算方法於高流場速度時，在分析計算上較困難，原因在於所截取的影像呈現為線(line)，若能增強雷射的強度與降低高速數位攝影機的曝光時間，則拍攝的影像會呈現為點(dot)，分析計算的誤差範圍則會降低許多。

The purpose of this paper is to establish the round tube jet assembly in a vertical water tunnel, and measure the flow speed by using Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV). Both PIV and PTV measurement approaches do not disturb the flow field. Experiments were illuminated by a green laser light sheet that was formed by cylindrical glass lenses in front of three semiconductor laser generators. Water in the vertical tunnel was seeded by tracer particles, which could scatter the laser light.
A high-speed digital camera was recording images of experiments. The flow velocity was estimated by the motion of these particles. The particles have similar density as that of water, so they are regarded as part of the fluid in the water tunnel. Water pump power was adjusted by changing the frequency of the inverter. Three distinct methods, simple visual method, PIV method and PTV method, were used to estimate the flow velocity. Experimental results show that, at low speed (2Hz to 10Hz), the velocity measurements of PIV have a deviation of 8% or less, and measurements of PTV have a deviation of 4% or less. At high speed (11Hz to 30Hz), the measurements of PIV have a deviation of 8% or less, and PTV fails to estimate the flow velocity. For high speed, enhancing intensity of the laser and reducing exposure time of the camera could reduce analysis error.

[1] 黃榮泰，單噴流於靜止及旋轉通道內衝擊冷卻現象研究，國立中山大學機械
與機電工程學系，博士學位論文，民國九十二年七月。

[2] T. F. Fric & A. Roshko, Vortical structures in the wake of a transverse
jet. J. Fluid Mech., 279 (1994), 1-47.

[3] R. F. Huang & R. H. Hsieh, An experimental study of elevated round jets
deflected in a crosswind, Experimental thermal and Fluid Science, 27
(2002), 77-86.

[4] R. F. Huang & R. H. Hsieh, Sectional flow structures in near wake of
elevated jets in a crossflow, AIAA Journal, 41 No. 8 (2003), 1490-1499.

[5] R. F. Huang & J. Lan, Vorticity evolution mechanism in near field of a
transverse jet, JCIE, 29 No. 4, (2006), 707-716.

[6] R. F. Huang & J. Lan, Characteristic modes and evolution processes of
shear-layer vortices in an elevated transverse jet, Physics of Fluids,
17 No. 3, (2005), 1-13.

[7] M. S. Chong & A. E. Perry, A general classification of three dimensional
flow fields, Phys. Fluids A, 2 No. 5 (1990), 765-777.

[8] R. J. Adrian, Particle imaging techniques for experimental fluid
mechanics, Annual Review of Fluid Mechanics, 23 (1991), 261-304.

[9] T. Dracos, Three Dimensional Velocity and Vorticity Measuring and Image
Analysis Techniques, ISBN-0-7923-4256-9 (1996).

[10] L. M. Jiji, Heat Convection, ISBN-3-540-30692-7 Springer (2006).

[11] F. M. White, Viscous Fluid Flow, McGraw-Hill, ISBN-007-124493-X (2006).

[12] B. R. Munson, D. F. Young & T. H. Okiishi, Fundamentals of Fluid
Mechanics, 4th edition John Wiley & Sons, Inc. ISBN-0-471-44250-X (2002).

[13] 蘭真，偏折噴流之剪流層渦漩動力機制與紊流特性，國立台灣科技大學機械工程系，
博士學位論文，民國九十四年十月。

[14] J. Westerweel, Fundamentals of digital particle image velocimetry,
Measurement science and technology, 8 (1997), 1379-1392.

[15] 謝政達，運用PIV與PTV量測技術於單一渦漩生成之研究，國立臺灣大學應用力學研究
所，碩士學位論文，民國九十三年七月。