액적충돌침식으로 인한 배관감육 예측체계 구축에 관한 연구
분야
공학 > 금속공학
저자
김경훈 ( Kyung Hoon Kim ) , 조연수 ( Yun Su Cho ) , 황경모 ( Kyeong Mo Hwang )
발행기관
한국부식방식학회(구 한국부식학회)
간행물정보
Corrosion Science and Technology 2013년, 제12권 제3호, 125~131페이지(총7페이지)
파일형식
22504289.pdf [무료 PDF 뷰어 다운로드]
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    영문초록
    The most common pipe wall thinning degradation mechanisms that can occur in the steam and feedwater systems are FAC (Flow Acceleration Corrosion), cavitation, flashing, and LDIE (Liquid Droplet Impingement Erosion). Among those degradation mechanisms, FAC has been investigated by many laboratories and industries. Cavitation and flashing are also protected on the piping design phase. LDIE has mainly investigated in aviation industry and turbine blade manufactures. On the other hand, LDIE has been little studied in NPP (Nuclear Power Plant) industry. This paper presents the development of prediction system for pipe wall thinning caused by LDIE in terms of erosion rate based on air-water ratio and material. Experiment is conducted in 3 cases of air-water ratio 0.79, 1.00, and 1.72 using the three types of the materials of A106B, SS400, and A6061. The main control parameter is the air-water ratio which is defined as the volumetric ratio of water to air (0.79, 1.00, 1.72). The experiments were performed for 15 days, and the surface morphology and hardness of the materials were examined for every 5 days. Since the spraying velocity (v) of liquid droplets and their contact area (Ac) on specimens are changed according to the air-water ratio, we analyzed the behavior of LDIE for the materials. Finally, the prediction equations(i.e. erosion rate) for LDIE of the materials were determined in the range of the air-water ratio from 0 to 2%.
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