Accession Number:

ADA162119

Title:

Optimization of Tip Store Modeling.

Descriptive Note:

Final rept. May 83-Sep 84,

Corporate Author:

OKLAHOMA UNIV NORMAN SCHOOL OF AEROSPACE MECHANICAL AND NUCLEAR ENGINEERING

Personal Author(s):

Report Date:

1985-03-01

Pagination or Media Count:

105.0

Abstract:

Due to the high cost of performing detailed three-dimensional flutter analyses for aircraft which are carrying large numbers and types of external stores, it is often not economically feasible to include sophisticated store aerodynamics especially when they will not cause significant changes to the flutter results. Thus, the stores are presently often modeled as simple flat plates. This tends to decrease the accuracy of the computed pressure distributions as the spanwise flow field and the wing-body interaction are not represented correctly. In this report, therefore, two methods, a doublet lattice method for subsonic flow and a kernel function method for subsonic and supersonic flow are used for the computation of unsteady pressure distributions and forces on an F-5 wing with a tip mounted launcherstore combination for various store models consisting of simple flat plates, endplated, and axisymmetric bodies. The resulting aerodynamic data are compared to existing experimental and numerical results for the same wingstore combination. The store modeling was optimized for simplicity and accuracy with respect to the aerodynamic forces and pressures. The wing-body interaction was improved without a considerable increase in complexity, i.e. panel number, and thus computational effort. Keywords Wing body configurations Aerodynamic stability. Author

Subject Categories:

  • Numerical Mathematics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE