Numerical Analysis For Double-base Propellant
Combustion
Author(s)
A. Peratta, C. Gonzalez & E. Dick
Abstract
A comprehensive hybrid Finite Volume (FV) Arbitrary Lagrangian–Eulerian
(ALE) scheme has been implemented in order to study the combustion of a
Double-Base (DB) solid homogeneous propellant (EC1 composition of
1100cal/g: 43% Nitrocellulose + 52% Nitroglycerine).
The formulation takes into account time dependent chemically reacting flows
and is based on the complete set of conservation equations of mass, momentum,
energy, and species concentration, considering finite rate chemistry, as well as
thermodynamic and transport property variations with temperature and species
concentration. The gas phase is treated as a compressible premixed chemically
reacting flow, composed of 11 species. The condensed phase is treated as a homogeneous
incompressible mixture of 12 reactive species. The chemical model is
implemented with 7 unidirectional global reactions. A 1D model has been prepared
in order to calculate the composition, flow pressure, temperature, velocity
and heat release in the dark zone, the primary and secondary flame regions. The
burning rate of the propellant results as a consequence of the zero concentration
of solid in the last cell of the condensed phase in contact with the gas phase. The
calculation employs an ALE technique in order to dynamically adapt the grid resolution
to the gradients of concentration, temperature and heat release along the
flame zone, and to incorporate new cells in the gas phase coming from the \“burnt”
cells of the condensed phase. The method developed provides an accurate description
of flame structure and flame dynamics near the burning surface as compared
with earlier publications and can be used to study a variety of time dependent
processes including transient ignition and combustion instabilities.
Keywords
Related Book
Other papers in this volume
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