以氣泡幕降低噪音是近年來一個有效的反潛手段，雖然已有許多論文討論了氣泡幕聲學效應，但對氣泡幕流場觀測的公開論文卻很少，大多數的論文皆是由聲學來找出氣泡幕的氣泡粒徑，因此在本文中將直接對於氣泡幕的流場進行觀測，利用水下攝影技術觀察氣泡於水下的運動情形。
本研究由船體的基本資料，由相似船型，自幾何外形與性能來擬合所需要的船形，利用船舶性能計算軟體來估算出設計出來的船殼基本資料，再利用模擬軟體來計算出船殼造成的艉流，也就是螺槳平面的入流，接著利用算出來的船體資料與螺槳平面入流，以螺槳設計軟體來設計螺槳，並進行空蝕評估，最後製造出螺槳實體，並進行單螺槳試驗以驗證設計。接著設置氣泡幕的施放系統，進行氣泡幕的流場觀測實驗。實驗結果發現，氣泡在船速越快時，粒徑會越來越小，這是因為在船高速航行時，氣泡管外壓力會變小，造成氣泡破裂的時間提早，會更快從氣泡管脫離。

Bubbles have been proven to be a successful noise-reducing technique for ships. Although numerous researches discuss the masker’s acoustics, the flow field measurement is scant of open literatures, and most of the dissertation use the acoustic method to find out the bubble diameters of masker. In this research, we observe the flow field, and use the underwater photo technique to observe the motion of underwater bubbles.
A ship model is used in this research: fitting to real ship from geometry and performance, using Rhino to fit ship’s geometry, and use orca3D to fit ship’s performance. And then, we simulate the wake by ShipFlow. We design propeller, using simulated wake data and ship’s data by Openprep.
We observed bubble motion by particle tracking velocimetry (PTV) , and observed bubble shapes by camera. In the experiment, we found that when the ship speeds up, the bubble diameter will become smaller.

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