Accession Number:

ADA291518

Title:

The 1995 Version of the NSWC Aeroprediction Code: Part 1. Summary of New Theoretical Methodology.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA

Report Date:

1995-02-01

Pagination or Media Count:

111.0

Abstract:

The NSWC Aeroprediction Code has been extended to angles of attack AOA greater than 30 deg. To accomplish this, several data bases were used to approximate the nonlinearities in individual missile component aerodynamics. Theoretical aerodynamic methods are used at small AOA. The new semiempirical model was applied to several configurations and the empirical constants adjusted to eliminate some of the errors associated with wind tunnel measurements of individual missile component loads. The new version of the code AP95 was then applied to several other missile configurations and estimates compared to data and other aerodynamic code calculations. Comparisons were made for Mach numbers 0.1 to 10.0 and AOA of 0 to 90 deg not all data were available on any single configuration. In general, average accuracy levels of or - 10 percent could be obtained for axial and normal force coefficient and or - 4 percent of body length for center of pressure, using the AP95. An exception to this was at AOA above 30 deg and at high supersonic Mach numbers, where nonlinearities caused by internal shock interactions were not accounted for. While these accuracy levels are very encouraging for a semiempirical code, improvements on the AP95 methodology could be made by additional missile-component wind-tunnel data at high AOA.

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE