배관 재질 손상에 미치는 액적충돌침식의 영향에 대한 연구

• Published in: 한국분무공학회지 Vol. 18; no. 1; pp. 9 - 15
• Main Authors: 김경훈, Kyung Hoon Kim, 조연수, Yun Su Cho, 김형준, Hyung Joon Kim
• Format: Journal Article
• Language: Korean
• Published: 한국분무공학회 30.03.2013; 한국액체미립화학회
• Subjects: air-water ratio; Erosion rate; LDIE; Liquid atomizing nozzle; Liquid Droplet Impingement Erosion; Two phase nozzle; 기계공학; 기액 비; 액적 충돌 침식; 액체 미립화 노출; 이유체 노즐; 침식률
• ISSN: 1226-2277; 2288-9051

Wall thinning of pipeline in power plants occurs mainly by flow acceleration corrosion (FAC), cavitation erosion (C/E), liquid droplet impingement erosion (LDIE). Wall thinning by FAC and C/E has been well investigated; however, LDIE in plant industries has rarely been studied due to the experimental difficulty of setting up a long injection of highly-pressurized air. In this study, we designed a long -term experimental system for LDIE and investigate the behavior of LDIE for three kinds of materials (A106b, SS400, A6061). The main control parameter was the air-water ratio (a), which was defined as the volumetric ratio of water to air (0.79, 1.00, 1.72). In order to clearly understand LDIE, the spraying velocity (v) of liquid droplets was controlled larger then 160m/s and the experiments were performed for 15 days. Therefore, this research focuses relation between erosion rate and air-water ratio on the various pipe-flow materials. Npp(nuclear power plant)`s LDIE pre-diction theory and management technique were drawn from the obtained data.