超空化潛體之阻力試驗

Experiment on Resistance of a Supercavitating Submerged Body

本文首先將建立超空泡水下高速潛體阻力量測與空泡特性觀測所需之相關試驗設備。本實驗將針對圓盤形超空泡激化器於不同空化係數與不同噴氣量下，對超空化潛體阻力特性以及其空泡穩定形成條件進行探討。由本實驗可知：噴氣超空泡產生後，潛體與水之間確實形成一穩定而透明之超空泡，而阻力明顯大幅下降為原來之28%以下：噴氣量超過某一定值後，阻力即不再持續下降，所剩下之阻力應只是空泡激化器之阻力。 In this paper, an experimental system is established to measure the resistance of a supercaviating submerged body and to observe its shape of supercavitation. The experiment is performed for a disk cavitator at different cavitation numbers and ventilation conditions. From the experiment, a stable and transparent supercavitation bubble between the submerged body and water can be observed and the drag of the submerged body is decreased to 28% of its original value in ventiated supercavitation conditions. And the drag of the body keeps constant when the quantity of the ventilated air is over a certain amount.