Accession Number:

ADA230162

Title:

Development of a Free-Jet Forebody Simulator Design Optimization Method

Descriptive Note:

Final rept. 1 Oct 1988-30 Jun 1990

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

Report Date:

1990-12-01

Pagination or Media Count:

74.0

Abstract:

An aerodynamic design optimization technique is presented that couples direct optimization algorithms with the analysis capability provided by appropriate computational fluid dynamics CFD programs. This technique is intended to be an aid in designing the aerodynamic shapes and establishing test conditions required for the successful simulation of aircraft engine inlet conditions in a ground test environment. However, the method is also applicable to other aerodynamic design problems such as airfoil design, turbomachinery cascade design, and nozzle design. The approach involves minimization of a nonlinear least-squares objective function that may be defined in a region remote to the geometric surface being optimized. In this study, finite, difference Euler and Navier-Stokes codes were applied to obtain the objective function evaluation, although the applied optimization method can be coupled with any appropriate CFD analysis technique. Using CFD to compute design space gradients within an optimization algorithm has received little prior attention in the literature. It is demonstrated that CFD can be used in this manner by applying the developed design technique to a variety of aerodynamic design problems. Results are presented for several typical aerospace examples, including inviscid and viscous flow over airfoils flows in convergentdivergent nozzles in both two and three dimensions, and supersonic flow about a planar forebody simulator.

Subject Categories:

  • Computer Programming and Software
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE