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Computational Analysis of the Flowfield of a Mixer-Ejector Nozzle  

Park, Yun-Ho (Ajou University, Department of Mechanical and Industrial Engineering)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.6, no.1, 2002 , pp. 71-82 More about this Journal
Abstract
A time-iterative compressible Navier-Stokes code is developed to analyze the flowfield of a two-dimensional ejector nozzle system. A parametric study has been made for two controlling parameters, duct to nozzle area ratio and nozzle pressure ratio. Results show that there is an optimum area ratio for an efficient pumping of secondary flow. At high area ratios, a freestream flow directly passes through the mixing duct without giving adequate pumping. While at low area ratios, jet boundary is acting as a blockage to incoming flow. The nozzle pressure ratio variation shows that the pumping rate increases as the pressure ratio increases provided there is no interaction between the shroud wall and the shock cell structure.
Keywords
Mixer-Ejector Nozzle; Parametric Study; Nozzle Pressure Ratio; Duct to Nozzle Area Ratio; Compressible Navier-Stokes Code; Shock Cell Structure; Pumping Rate;
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