함정의 평판형 방향타 캐비테이션 침식에 대한 모형 시험 연구

• Published in: 大韓造船學會 論文集 Vol. 60; no. 1; pp. 31 - 37
• Main Authors: 백부근(Bu-Geun Paik), 안종우(Jong-Woo Ahn), 박영하(Young-Ha Park), 송재열(Jae-Yeol Song), 고윤호(Yoon-Ho Ko)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2023
• Subjects: 조선공학; Rudder deflection angle(방향타타각); Image processing technique(영상처리 기법); Cavitation tunnel(캐비테이션 터널); Rudder(방향타); Cavitation erosion(캐비테이션 침식)
• ISSN: 1225-1143; 2287-7355
• DOI: 10.3744/SNAK.2023.60.1.31

In the present study, a method of performing cavitation erosion test directly on the anodized surface of the rudder model is proposed, not applying ink or paint on its surface. An image processing technique is newly developed to quantitatively evaluate the erosion damages on the rudder model surface after erosion test. The preprocessing saturation image, image smoothing, adaptive hysteresis thresholding and eroded area detection algorithms are in the image processing program. The rudder cavitation erosion tests are conducted in the rudder deflection angle range of 0° to -4°, which is used to maintain a straight course at the highest speed of the targeted navy ship. In the case of the conventional flat-type full-spade rudder currently being used in the target ship, surface erosion can occur on the model rudder surface in the above rudder deflection angle range. The bubble type of cavitation occurs on rudder surface, which is estimated to be the main reason of erosion damage on the rudder surface.