CFD-based three-dimensional turbofan exhaust nozzle analysis system

Abstract

A three-dimensional turbofan exhaust nozzle analysis system based on computational fluid dynamics (CFD) has been developed. This system has been established to aid exhaust designers in the efficient assessment and screening of their design concepts, with the prospects of a reduction in both design cycle time and wind-tunnel test costs. A reliable CFD flow solver, user-friendly grid generator, and postprocessing software are included in the system. The system is easy to use for exhaust designers who are not particularly familiar with the inner workings of CFD. Validation and applicability studies have been performed using different exhaust nozzle configurations at on-design and off-design engine operating conditions. This work demonstrates that a CFD code integrated with automatic grid generation and postprocessing can be a useful analytical tool in the practical exhaust nozzle design process. Nomenclature M = Mach number P = static pressure PA = atmospheric static pressure R = radius X — axial station XREF = reference length Subscript 00 = freestream conditions