함정의 평판형 방향타 캐비테이션 침식에 대한 모형 시험 연구
Study on the Model Tests of Cavitation Erosion Occurring in Navy Ship’s Flat-Type Rudder
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초록
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 0o to -4o, 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.
Abstract
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 0o to -4o, 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.
참고문헌 (5)
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- Base technology of test estimation for propeller and rudder performance (5th year), "Kim, K.S.", KRISO, ~ (2014)
- 백부근, "함정용 방향타에서 발생하는 구름(cloud) 캐비테이션의 주파수 특성에 대한 실험적 연구", 대한조선학회 논문집, 58(3), pp.167~174 (2021), 대한조선학회[DOI]
- Pfitsch, W., "Development of measurement techniques for studying propeller erosion damage in severe wake fields", CAV2009 (2009), Ann Arbor