Accession Number : ADA216998

Title :   External Flow Computations for a Finned 60MM Ramjet in Steady Supersonic Flight.

Descriptive Note : Memorandum rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Guidos, Bernard J.

Report Date : DEC 1989

Pagination or Media Count : 50

Abstract : The US Army Ballistic Research Laboratory (BRL) has participated in the development of the launch and flight technologies for a family of solid fuel ramjet (SFRU) projectiles. The ramjet is a tubular projectile which utilizes air ingested through the inlet to burn the solid fuel. When the combustion process ceases, the projectile becomes a high drag configuration. Several designs have been developed as potential tank gun training rounds (TGTR) for kinetic energy (KE) penetrators. This report documents a computational fluid dynamics study of the external aerodynamics of a finned 60mm solid-fuel ramjet in steady, supersonic, atmospheric flight. The main objective is to compute the external contribution to the pitch-plane aerodynamics using established in-house capabilities. Two space-marching finite-difference procedures are used to compute the external flow fields. Viscous flow results are generated using a thin-layer, parabolized Navier-Stokes technique; inviscid results are generated using an Euler solver. Results are shown for three configurations; Body-alone, body with original fins, and body with extended fins. The influence of initial marching conditions on the modeling of an inlet configuration is examined. A generalized scaling law is introduced which may improve the accuracy of future external space-marching flow computations for ramjets. Keywords: Fin-stabilized projectile; Supersonic flow; Wedge flow; Conical flow. (AW)

Descriptors :   *FIN STABILIZED AMMUNITION, *PROJECTILES, *AEROBALLISTICS, ACCURACY, AERODYNAMICS, COMBUSTION, COMPUTATIONS, CONFIGURATIONS, CONICAL BODIES, DRAG, EXTERNAL, FINITE DIFFERENCE THEORY, FINS, FLIGHT, FLOW, FLOW FIELDS, FLUID DYNAMICS, INLETS, INVISCID FLOW, KINETIC ENERGY, LAUNCHING, MODELS, NAVIER STOKES EQUATIONS, PARABOLAS, PENETRATION, RAMJET ENGINES, SCALING FACTOR, SOLID FUELS, SOLID JET ENGINE FUELS, STEADY STATE, SUPERSONIC FLIGHT, SUPERSONIC FLOW, TUBULAR STRUCTURES, VISCOUS FLOW, WEDGES, KINETIC ENERGY PROJECTILES, GUIDED MISSILES, GUN LAUNCHED.

Subject Categories : Guided Missile Dynam, Config & Cntrl Surfaces
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE