近年來艉隧道應用在滑航艇的情況已經越來越普遍。然而艉隧道性能探討的文獻仍然不多，尤其是流場的部分。因此，我們需要艉隧道內的流場趨勢以及速度分佈。在本研究中我們發展了2維移動PIV系統來測量流場變化情形，藉此我們可以提供流場的相關數據方便與其他的模擬方法比對。
在本研究中，我們在拖航水槽的台車上建立了一套移動式PIV系統，並在台車上拖行船模進行觀察流線方向及斷面方向的流場情形，船模是1:14具艉隧道的滑航艇以0.69m/s的速度拖行。在船模與PIV系統中，特別是移動系統與光學配件的部分，我們成功地發展一套方法克服因艉隧道的特殊曲率外型所造成照片擷取與雷射照射路徑上的阻礙。這些在大水槽中的移動式PIV系統相關的技術在本文中有詳細的說明。在實驗前或實驗過程中的不合理現象皆有標註及合理的解釋。
在本研究中的速度分佈與流場趨勢結果中，無論是實驗結果或是與其他的研究比對，如LDV及CFD模擬皆有良好的結果。本次實驗結果與分析也證實先前的艉隧道研究假設與結果可以減少螺槳區域之前的缺陷速度分佈，以及增加螺槳斷面前的入流。

The stern tunnel is commonly used for high-speed planing crafts. However, it is only few studies that have been conducted for the performance of stern tunnel particularly for the flow field.
Accordingly, flow field measurement of stern tunnel is required particularly for study the flow pattern and velocity component profile due to the stern tunnel. 2D moving PIV system have been developed in this thesis project following to measure the flow field of stern tunnel where the PIV measurement is used to provide the flow field measurement result comparing with other experiment fluid dynamic methods.
In this thesis project, a moving PIV system is installed on the carrier of a towing tank and moving with the ship model. The measurement system provide both streamwise and cross streamwise planes. A 1:14 scale ship model with stern tunnel design is applied at towing speed 0.69 m/s.
The ship model and PIV system, particularly the traverse and optical component, have been developed and modified successfully to overcome the blocking accessible of the image and laser light path due to the characteristics of high-speed planing craft and typical curvy shape of the stern tunnel. The methodologies and associated techniques for moving PIV measurement in a large towing tank are described in detail. Any discrepancies prior and during experiments are also identified and explained reasonably.
Velocity component profiles and flow pattern as the result of the studies are presented well and compared with other result studies, i.e. LDV measurement and CFD simulation. The experiment results and analysis confirm previous studies’ assumptions and results about the present of stern tunnel that could decrease the defect velocity profile prior the propeller region and increase the inflow of propeller region.

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