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Anti-Cavitation Trim을 갖는 고차압 제어밸브의 유동특성에 관한 수치해석
안영준(Y. J. Ahn),김병진(B. J. Kim),신병록(B. R. Shin) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Numerical analysis of three dimensional incompressible turbulent flows in LNG marine high pressure drop control valves was carried out by using the commercial CFD-ACE code. In this study, flow characteristics of control valves with complex flow fields including cavitation effect were investigated. Simulation was performed on five models of control valve that had different orifice diameters of Anti-trim and the size of valve. Comparing newly designed control valves for controling the occurrence of cavitation with the conventional valve, new valves showed a improved flow pattern with almost no cavitation.
정세훈(S. H. Jung),안영준(Y. J. Ahn),안승일(S. I. Ahn),신병록(B. R. Shin) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
In general, metal cutting operations involve generation of heat due to friction between the tool and the pieces and due to energy lost deforming the material. This heat needs to be carried away otherwise it creates white spots. To reduce this abnormal heat cutting fluid is used. Cutting fluid also has an important role in the lubrication of the cutting edges of machine tools and the pieces they are shaping, and in sluicing away the resulting swarf. As a cutting fluid, water is a great conductor of heat but is not stable at high temperatures, so to improve stability an emulsion type mixed fluid with water and oil is often used. It is pumped over the cutting site of cutting machines as a state of atomized water droplet coated with oil by using jet flow. In this paper, to develop cutting fluid supplying nozzle to obtain ultra thin oil film for coating water droplet, a numerical analysis of three dimensional mixed fluid jet flows through multi-stage nozzle was carried out by using a finite volume method. Jet flow characteristics such as nozzle exit velocity, development of mixing region, re-entrance and jet intensity were analyzed. Detailed mixing process of air, water and oil in air flow were also investigated. It is easy to understand flow pattern in multi-stage nozzle. Important flow information for advance design of cutting fluid supplying nozzle was drawn.