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1,2,3 Graduate Student, Aeronautical system engineering, Hanseo University, Taean,ChungNam, 32158, Repulic of Korea 4,5,6 Professor,Aeronautical system engineering, Hanseo University, Taean,ChungNam, 32158, Repulic of Korea kihyuk1569@naver.com, jdlee0818@naver.com, tmddnjs072@naver.com, heligyro@hanseo.ac.k ,viscous@hanseo.ac.kr, lars@hanseo.ac.k Corresponding author*: Dong-jin Sheen : mobile Phone: +82-10-8698-3068

A Numerical Study on the Flow Characteristics According to the Operating Speed of Hollow Jet Valve