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임계 노즐을 통하는 기체 유동의 유출계수와 임계 압력비에 관한 연구
김재형(J. H. Kim),우선훈(S. H. Woo),김희동(H. D. Kim),박경암(K. A. Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The air flow through a critical nozzle with a small throat diameter is significantly affected by viscous<br/> effect. In this paper, computational study using the axisymmetric, compressible, Navier-Stokes Equations is<br/> carried out to analy ze flow characteristic through a critical nozzle at low-Reynolds numbers. The nozzle<br/> throat diameters of D=0.28~4.48mm are used in this study. Computational results are compared with the<br/> previous experimented ones. It is found that the present computational results predict the critical pressure ratio<br/> and the discharge coefficient well. As the diameter of a critical nozzle increases, the discharge coefficient and<br/> critical pressure ratio increase. At the nozzle throat, the displacement and momentum thicknesses of the<br/> boundary layer are obtained by an empirical equation.