Accession Number : ADA301817

Title :   Navier-Stokes Computations for a Reacting, M864 Base Bleed Projectile.

Descriptive Note : Final rept. Jan 92-Jan 93,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Nietubicz, Charles J. ; Gibeling, Howard J.

PDF Url : ADA301817

Report Date : OCT 1995

Pagination or Media Count : 38

Abstract : The M864 projectile is an extended range design which includes both a dome base cavity and a base burn capability. The extended range is accomplished through the injection of hot, fuel-rich gas which burns in the initially low-pressure base region. The present analysis utilizes a Navier-Stokes computational technique which includes finite rate chemistry to model the reacting base flow region for the M864. Calculations have been performed for the full projectile configuration, including the base region for a Mach number range of 0.8 < M S 3.0. The reacting gas was modeled as a mixture of H2 and CO. Calculations show a significant increase in base pressure with the injection of both H2 and CO due to the more distributed nature of the base combustion and the higher wake region temperatures. Computations were obtained at Mach = 3.0 for conditions of no bleed, nonreacting hot gas injection, and H2 and CO injection. Results are presented in the form of temperature contours and velocity vectors in the near-wake region for this case. Comparisons of the computed drag coefficient, CD0, are made with trajectory model predictions based on actual range firings of the M864.

Descriptors :   *AERODYNAMIC DRAG, *EXTENDED RANGE PROJECTILES, MATHEMATICAL MODELS, INJECTION, TIME DEPENDENCE, TURBULENCE, LOW PRESSURE, COMPUTATIONAL FLUID DYNAMICS, GAS DYNAMICS, HYDROGEN, COMBUSTION, LOW VELOCITY, MASS FLOW, FLOW FIELDS, MATHEMATICAL PREDICTION, WAKE, HOT GASES, MACH NUMBER, SUBSONIC FLOW, NAVIER STOKES EQUATIONS, VISCOUS FLOW, PROJECTILE TRAJECTORIES, GAS SURFACE INTERACTIONS, BASE PRESSURE, BASE FLOW.

Subject Categories : Ammunition and Explosives
      Fluid Mechanics
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE