Integrated Nacelle-Wing Shape Optimization for an Ultra- High Bypass Fanjet Installation on a Single-Aisle Transport Configuration

摘要

Ultra-High Bypass (UHB) fanjet engines offer substantial improvements in fuel burn and take-off noise, and are an important part of efforts to reduce the environmental impacts of commercial air travel. To fully achieve the performance gains offered by UHB engines, an integrated design approach is necessary where the wing and nacelle shapes are optimized simultaneously. The new Cart3D-Adjoint Optimization Framework was used to design a representative single-aisle transport configuration with a UHB nacelle. The optimization process produced an integrated wing-nacelle design with a number of interesting features, including an unusual spanwise lift distribution and local tailoring of the supercritical wing shape in the viscinity of the nacelle. Viscous effects were accounted for by using an inverse design method coupled with a viscous flow solver to adjust the shape of the wing to maintain the desired span loading and section pressure distributions of the inviscid optimized design. Selected computational and experimental results are presented which highlight interesting characteristics of the integrated nacelle-wing design and its performance.