近二十年來雷射都普勒測速儀(Laser Doppler Velocimetry，簡稱LDV)已發展為一成熟的流場觀測方法，本研究將建立一個非侵入性的LDV量測系統以應用於船模艉隧道流場量測實驗中，提供滑航艇設計艉隧道時一個有利的參考依據。
本文將討論此系統之技術及實驗方法，設備的架置方式和配置具有較高的調整性，使用自製的LDV移動平台、光學系統、以及質點施放系統，並制定一實驗流程規範，再分別針對實驗所得之滑航艇艉隧道不同斷面速度分佈進行流場分析；實驗結果發現在縱向速度量測可行性較高，而實驗方法會受實驗設備的限制：單航單次中僅能量測單一量測點，可藉由高功率雷射及自動化移動平台來改進；橫向及垂向速度量測較困難，可藉由使用高頻率雷射或使量測體積旋轉一角度再經座標轉換來解決；與PIV同時量測時，會受PIV產生之非連續光源干擾，需分開實驗；船模本身大小亦會限制實驗方法，需使用大型船模或將船模固定於航行姿勢量測以免超載。

In the last two decades, Laser Doppler Velocimetry (LDV) has become a mature method of flow observation. In this study, the LDV system, which is a non-intrusive measurement technique was applied successfully to the stern tunnel flow field measurement experiments. This technique can provide a favorable reference for the stern tunnel design process of the planing craft.
The experimental method and technique were discussed in this thesis. The mounting and arrangements of all devices were adjustable, such as a home-made LDV traverse platform, optical mirror systems, and the particle-seeding device which was fixed in front of the carrier. After tries and errors, a special techniques and a standard procedure for conducting experiments were established. Then, the flow fields at each section of the tunnel on different towing speed can be analyzed, the results shows a higher feasibility on longitudinal velocity measurement. At last, all related problems due to the limitation from equipments or the ship model were discussed. The time- consuming problem may be solved by using a high power laser with an auto-control traverse system. The difficulty of transverse and vertical velocity measurements can be improved by using high frequency laser or rotating the probe volume a small angle to measure. LDV experiment should work separately with PIV, avoiding the influence from the PIV discontinuous laser sheet. To avoid overloading of the ship model, it is suggested to use a large ship model or fix the ship model on its sailing position during experiments.

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