EXERGY BASED DESIGN METHODOLOGY FOR WING SHAPE OPTIMIZATION AND ANALYSIS

摘要

This paper applies exergy-based methods to subsonic wing planform shapes in an effort to study the impact of exergy utilization on aerodynamic designs. Our intent here is to report our efforts to couple a numerical code with an exergy analysis to enable the optimization of wing shapes and wing lift distributions for different aircraft flight mission segments within a design framework that can be coupled with other vehicle-level system aspects. Validation and verification of an exergy-based optimization is performed to predict entropy generated on simple airfoils and wings under turbulent flow conditions. Entropy generation and its relationship to total and induced drag are predicted for different twisted wing shapes under both inviscid (Euler) and viscous flow conditions. Induced drag is predicted using a far-field (Trefftz-plane) analysis. Results show that the prediction of entropy generation can be used to estimate the viscous drag of a wing with good fidelity and that entropy generation can be used to correct for the artificial viscosity found in numerical methods to allow for good prediction of induced (inviscid) drag.