Journal ArticleDOI
Effects of acoustic oscillations on flame dynamics of homogeneous propellants in rocket motors
TLDR
In this paper, the interaction between acoustic waves and gas-phase flame dynamics of a double-base homogeneous propellant in a rocket motor has been studied by means of a comprehensive numerical analysis.Abstract:
The interactions between acoustic waves and gas-phase flame dynamics of a double-base homogeneous propellant in a rocket motor has been studied by means of a comprehensive numerical analysis. The formulation treats the complete conservation equations of mass, momentum, energy, and species concentration, and accounts for finite rate chemical kinetics in the gas phase and subsurface reactions. The model has been implemented to examine the detailed flow structures and heat-release mechanisms in various parts of the motor, including microscale motions near the propellant surface and macroscale motions in the bulk of the chamber. Results indicate that strong interactions between exothermic reactions and acoustic waves occur in regions with steep temperature gradients due to the large activation energy of the associated chemical kinetics. The dynamic behavior of the luminous flame plays a decisive role in determining the motor stability characteristics. Distributed combustion response in the gas phase provides the energy for driving flow oscillations, and can be treated correctly as a combination of monopole and dipole sources based on acoustic theory.read more
Citations
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Journal ArticleDOI
Geophysical fluid dynamics.
TL;DR: Specialized experiments with atmosphere and coupled models show that the main damping mechanism for sea ice region surface temperature is reduced upward heat flux through the adjacent ice-free oceans resulting in reduced atmospheric heat transport into the region.
Book
Solid propellant chemistry, combustion, and motor interior ballistics
TL;DR: In this article, the authors present in-depth coverage on a wide range of topics including advanced materials and non-traditional formulations; the chemical aspects of organic and inorganic components in relation to decomposition mechanisms, kinetics, combustion and modelling; safety issues, hazards and explosive characteristics; and experimental and computational interior ballistics research, including chemical information and the physics of the complex flow field.
Journal ArticleDOI
Modeling of combustion and ignition of solid-propellant ingredients
TL;DR: A comprehensive review of recent advances in the modeling and simulation of various solid-propellant ingredients over a wide range of ambient conditions is provided in this article, focusing on the steady-state combustion and laser-induced ignition of nitramines.
Journal ArticleDOI
Aeroacoustic Instability in Rockets
Gary A. Flandro,Joseph Majdalani +1 more
TL;DR: In this article, a more complete representation of the linearized motor aeroacoustics is utilized to determine the growth or decay of the system energy with rotational e ow effects accounted for already.
Journal ArticleDOI
A Model of AP/HTPB Composite Propellant Combustion in Rocket-Motor Environments
TL;DR: In this article, a comprehensive theoretical/numerical model for treating AP/HTPB composite-propellant combustion in a rocket-motor environment is presented, which takes into account the conservation equations in both the gas and condensed phases, and accommodates finite-rate chemical kinetics and variable thermophysical properties.
References
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TL;DR: In this article, the Laplace's functions of T, F, V are simultaneously reducible to sums of squares, where T is the length of a string, F is the degree of freedom of the string, and V is the size of the chord.
Journal ArticleDOI
Geophysical fluid dynamics.
TL;DR: Specialized experiments with atmosphere and coupled models show that the main damping mechanism for sea ice region surface temperature is reduced upward heat flux through the adjacent ice-free oceans resulting in reduced atmospheric heat transport into the region.
Coefficients for calculating thermodynamic and transport properties of individual species
TL;DR: In this article, a library of thermodynamic data and transport properties are given for individual species in the form of least-squares coefficients for 1130 solid, liquid, and gaseous species.
Journal ArticleDOI
A review of calculations for unsteady burning of a solid propellant.
TL;DR: A = E(l T^ admittance function, Eq. (1) sensitivity of gas phase to pressure changes specific heats of solid and gas activation energy for surface reaction E = ES/RTS enthalpy latent heat for surface reactions; Hp > 0 for exothermic s_urface reaction H = Hp/cT average mass flux fluctuation of mass flux at the surface index in the linear burning rate law, r = ap index in surface pyrolysis law as discussed by the authors.