Investigation of Advanced Mixer-Ejector Exhaust System.

摘要

A combined experimental and analytical investigation is being conducted to study advanced mixer-ejector exhaust systems. The program is designed to provide benchmark experimental data relative to several advanced mixer-ejector exhaust system configurations; in addition, analytical flowfield development and plume assessment calculations will be performed. Exhaust mixing, ejector pumping, and the mixer-ejector exit plane three-dimensional velocity field will be investigated. A slot nozzle ejector configuration will be investigated under the contractor's internal research program in gas dynamics, in order to provide a baseline with which to compare mixer-ejector results. The JETPATH code shall be used to calculate flowfield development downstream of the mixer-ejector for the purpose of generating aerodynamic input for plume assessment calculations. Plume assessment calculations will be performed using the IPAT code. In addition, an experimental compressibility assessment of convoluted exhaust nozzle mixing effectiveness will be performed. This involves low speed testing of an advanced mixer nozzle which was tested previously at a supersonic operating condition. The compressibility assessment will assist a parallel contract to develop improved prediction procedures for vortical flowfield development downstream of convoluted trailing edge configurations. (jhd)