Computational Investigation of Two-Dimensional Ejector Performance

Abstract

Computational Fluid Dynamics has been used to develop performance maps of thrust augmenting ejectors for use in the conceptual design of STOVL aircraft. The effect of changes in the principle ejector design parameters, including the inlet area, diffuser area, and length of the ejector duct, as well as the type and configuration of the primary nozzles, were computed. It is concluded that the optimum inlet area occurs at a relatively narrow peak whose value depends on the length of the ejector duct. It has also been shown that a workstation can be used to compute accurate solutions of the Reynolds averaged Navier-Stokes equations, in a computational domain large enough to include the elliptic effect of the conditions at the ejector exit on the flow into the ejector inlet.