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다양한 노즐 길이 대 폭 비율과 니들 위치에 따른 캐비테이션 유 동 특성에 대한 실험 및 해석 연구
김병균 ( Byunggyun Kim ),조성인 ( Seongin Jo ),박동진 ( Dongjin Park ),박수한 ( Suhan Park ) 한국액체미립화학회 2018 한국액체미립화학회 학술강연회 논문집 Vol.2018 No.-
The purpose of this study is to analyze cavitation flow characteristics according to the needle position and length-towidth ratios of the nozzle by experimental and numerical investigations. The needle positions were tested in five and simulate the eccentricity of the needle. The length-to-width ratios were tested in 2.0 and 2.67. The width of the nozzle was changed to 3 mm and 4 mm, and the length of the nozzle was fixed to 8 mm. The cross-section of test nozzles has a rectangle shape. Inside of the nozzle was visualized using a shadow graphic visualization technique. In this study, the three dimensionless numbers, the Reynolds number, the cavitation number, and the discharge coefficient, were used for the analysis of cavitating flow characteristics. The quantitative characteristics of the cavitating flow were measured and analyzed from captured images using image processing code. In addition, the numerical simulations were carried out with commercial CFD software, FLUENT 18.1. To model turbulence, the K-epsilon model is used and the Schnerr and Sauer model is adopted as the cavitation model in this work.