Abstract
In this paper, an explicit time-dependent full Navier-Stokes solution is used to analyze flow field of a two-dimensional ejector-nozzle system. In order to investigate its performance, a parametric study was performed using three controlling parameters duct to nozzle area ratio, nozzle pressure ratio and Reynolds number. Results show that there is an optimum area ratio for efficient pumping of secondary flow. At high area ratios, a free stream flows directly through the mix duct without giving adequate pumping so that secondary flow in the ejector-nozzle system is reduced. On the other hand, at low area ratios, secondary flow is blocked by the jet boundary. A larger nozzle pressure ratio will result in higher efficiency in pumping. However, due to interaction between the duct wall and shock cell structure, a decrease in efficiency of the ejector-nozzle system occurs. The pumping rate increases with Reynolds number while the loss of the system decreases with it.
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