Accession Number:

ADA133684

Title:

Computational Modeling of Aerodynamic Heating for XM797 Nose Cap Configurations

Descriptive Note:

Final rept.

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Report Date:

1983-09-01

Pagination or Media Count:

48.0

Abstract:

The XM797 is a proposed training round for the 105mm M735 high velocity projectile. This projectile is designed to have a trajectory that closely follows that of the M735 yet have a maximum range of 8km. To achieve this performance the XM797 is designed with a nose cap made of zinc alloy which, due to structural weakening caused by aerodynamic heating and centrifugal loads due to spin, is supposed to fail and result in the projectile breaking apart. This paper summarizes the results of a computational study of the effects of aerodynamic heating for several zinc alloy and steel nose cap configurations for flight conditions pertinent to the development testing of the shell. The computational results were obtained using the ABRES Shape Change Code ASCC developed by AcurexAerotherm for numerically modeling the in-depth unsteady temperature response of an ablating reentry vehicle. Examples of the in-depth temperature response of XM797 nose cap configurations are shown which demonstrate the capability of the code to predict the effects of ablation, location of boundary layer transition, projectile preconditioning temperature, and atmospheric conditions. Comparisons of the computational results to the results of test firings are shown which have provided assistance in the analysis of the projectile performance.

Subject Categories:

  • Ammunition and Explosives
  • Fluid Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE