Internal flow field and mass flow rate of 2DCD ejector nozzles

Abstract

One of the most promising exhaust nozzles for future super/hypersonic transports will be a nonaxisymmetric variable geometry nozzle and more than likely the ejector nozzle which introduces bleed/bypass air from the intake section in order to solve inlet/engine flow mismatch, cool nozzle walls, reduce external drags, and thus improve overall performance of the propulsion system. In the present study, cold flow tests with a scale model of a typical two-dimensional convergentdivergent (2DCD) ejector nozzle configuration have been carried out to investigate its internal flow field and aerodynamic performances such as mass flow ratio. An optical flow visualization method such as MachZehnder interferometry have been used. Shear layers, compression waves and equi-density contours hi the nozzle flow field are visualized. Two-dimensional CFD prediction has been carried out and compared with the test results. The agreement of the prediction with test results is fairy good. The parameters that determine mass flow rate of primary and secondary flow have been studied using the CFD method.