선박용 공기윤활 시스템의 기포 유동장 가시화 연구

Visualization of bubbly flow generated in an air lubrication system for ships

This study developed techniques for quantitatively evaluating the generative characteristics of flow fields in the ALS (Air Lubrication System) for ships through model experiments in a cavitation tunnel. The object was to clarify the similarity relations between the bubble layer flow fields of models and full-scale ships. Specifically, for the ALS system, which injects air to increase insertion loss and thereby reduce noise, the focus was on analyzing the bubble layer flow fields. An image segmentation algorithm based on OpenCV was developed to quantitatively assess the bubble layers, along with methods for analyzing the size and quantity of bubbles. Spatial densities of 10%, 50%, and 100% were established at extremely low, low, and high flow rates respectively with increasing flow speed leading to increased spatial density and individual bubble size.