Design of 3-D Nacelle near Flat-Plate Wing Using Multiblock Sensitivity Analysis (ADOS)One of the major design tasks involved in reducing aircraft drag is the integration of the engine nacelles and airframe. With this impetus, nacelle shapes with and without the presence of a flat-plate wing nearby were optimized. This also served as a demonstration of the 3-D version of the recently developed aerodynamic design optimization methodology using sensitivity analysis, ADOS. The required flow analyses were obtained by solving the three-dimensional, compressible, thin-layer Navier-Stokes equations using an implicit, upwind-biased, finite volume scheme. The sensitivity analyses were performed using the preconditioned version of the SADD scheme (sensitivity analysis on domain decomposition). In addition to demonstrating the present method's capability for automatic optimization, the results offered some insight into two important issues related to optimizing the shapes of multicomponent configurations in close proximity. First, inclusion of the mutual interference between the components resulted in a different shape as opposed to shaping an isolated component. Secondly, exclusion of the viscous effects compromised not only the flow physics but also the optimized shapes even for isolated components.
Document ID
19960008930
Acquisition Source
Headquarters
Document Type
Contractor Report (CR)
Authors
Eleshaky, Mohamed E. (Alexandria Univ. Egypt)
Baysal, Oktay (American Inst. of Aeronautics and Astronautics Washington, DC., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1994
Publication Information
Publisher: American Inst. of Aeronautics and Astronautics
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NAS 1.26:199745NASA-CR-199745NIPS-95-06457AIAA PAPER 94-0160