SRB combustion dynamics analysis computer program (CDA-2). Final report

Technical Report · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5420430

Chung, T J; Park, O Y

Two-dimensional combustion dynamics of solid propellants numerically modeled by finite element calculations and applied to a one-dimensional cast for comparison is examined. A multi-dimensional numerical model was developed for the unsteady state oscillatory combustion of solid propellants subject to acoustic pressure disturbances. Including the gas-phase effects, the assumption of uniform pressure across the flame zone, which was conventionally used, is relaxed such that a higher frequency response in the long flame of a double-base propellant can be calculated. The formulation is based on a premixed, laminar flame with a one-step overall chemical reaction and the Arrhenius law of decomposition with no condensed phase reaction. In a given geometry, the Galerkin finite element solution shows the strong resonance and damping effect at the lower frequencies. Extended studies deal with the higher frequency region where the pressure varies in the flame thickness. The nonlinear system behavior is investigated by carrying out the second order expansion in wave amplitude when the acoustic pressure oscillations are finite in amplitude. Offset in the burning rate shows a negative sign in the whole frequency region considered, as confirmed by existing experimental results. Finally, the velocity coupling in the two-dimensional model is discussed in terms of higher order perturbations.

• Research Organization: Alabama Univ., Huntsville, AL (USA)
• OSTI ID: 5420430
• Report Number(s): N-89-18526; NASA-CR--184663; NAS--1.26:184663
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMPUTER CODES
DOCUMENT TYPES
ENERGY TRANSFER
FINITE ELEMENT METHOD
FLUID FLOW
HEAT TRANSFER
KINETICS
LAMINAR FLOW
MATHEMATICAL MODELS
NUMERICAL SOLUTION
PRESSURE EFFECTS
PROGRESS REPORT
PROPELLANTS
REACTION KINETICS