이중관 노즐 형상비 변화에 따른 유동특성에 관한 수치적 연구

The nozzle aspect ratio has a significant influence on the nozzle performance. The numerical study has been performed to investigate the flow characteristics of double nozzle. In particular, five aspect ratios of nozzle tip length/diameter (L0/D0 = 0, 0.5, 1, 1.5 and 2) and two different inlet velocity were considered. Computational fluid dynamics(CFD) calculations were implemented with the help of commercial software, ANSYS CFX. The pressure and velocity distributions, and throw length were graphically depicted.