Aluminum-particle ignition and combustion behind shock and detonation waves

1987 ◽  
Vol 23 (1) ◽  
pp. 6-11 ◽  
Author(s):  
E. A. Afanas'eva ◽  
V. A. Levin
Keyword(s):  
Aluminum Particle ◽  
Detonation Waves ◽  
Particle Ignition ◽  
Ignition And Combustion ◽  
Shock And Detonation Waves

Mechanistic Model for Aluminum Particle Ignition and Combustion in Air

2005 ◽  
Vol 21 (3) ◽  
pp. 478-485 ◽  
Author(s):  
Paul E. DesJardin ◽  
James D. Felske ◽  
Mark D. Carrara
Keyword(s):  
Mechanistic Model ◽  
Aluminum Particle ◽  
Particle Ignition ◽  
Ignition And Combustion

scholarly journals Measurements in Solid Propellant Plumes at Ambient Conditions

2011 ◽  
Author(s):  
Jonathan L. Height ◽  
Burl A. Donaldson ◽  
Walter Gill ◽  
Christian G. Parigger
Keyword(s):  
Temperature Distribution ◽  
Solid Propellant ◽  
Aluminum Particle ◽  
Burning Surface ◽  
Ambient Conditions ◽  
Aluminum Particles ◽  
Open Atmosphere ◽  
Particle Ignition ◽  
Accident Scenarios ◽  
Color Pyrometer

The study of aluminum particle ignition in an open atmosphere propellant burn is of particular interest when considering accident scenarios for rockets carrying high-value payloads. This study investigates the temperature of an open atmosphere Atlas V solid propellant burn as a function of height from the burning surface. Two instruments were used to infer this temperature: a two-color pyrometer and a spectrometer. The spectra were fitted to a model of energy states for aluminum monoxide. The temperature which provided the best match between the model and data was taken as the reaction temperature. Emissions above 30 inches from the surface of the propellant were not sufficiently strong for data reduction, perhaps obscured by the alumina smoke cloud. The temperature distribution in the plume increased slightly with distance from the burning surface, presumably indicating the delay in ignition and heat release from the larger aluminum particles in the propellant. The pyrometer and spectrometer results were found to be in excellent agreement indicating plume temperatures in the range of 2300K to 3000K.

Cylindrical shock and detonation waves in magnetogasdynamics

1969 ◽  
Vol 39 (4) ◽  
pp. 705-725 ◽  
Author(s):  
A. H. Christer ◽  
J. B. Helliwell
Keyword(s):  
Shock Waves ◽  
Strong Shock ◽  
Flow Patterns ◽  
Detonation Waves ◽  
Cylindrically Symmetric ◽  
Constant Strength ◽  
Self Similar ◽  
Axis Of Symmetry ◽  
Similar Solutions ◽  
Shock And Detonation Waves

Self-similar flow patterns are studied which arise when a cylindrically symmetric strong shock or detonation wave propagates outwards into a gas at rest in which the ambient density varies as the inverse square of the distance from the axis of symmetry along which flows a line current of either zero or finite constant strength. The electrical conductivity of the gas on either side of the wave is supposed perfect and the discontinuities discussed are either gasdynamic or magnetogas-dynamic in nature. It is shown that self-similar solutions exist for piston driven gasdynamic detonation and shock waves. Whilst no self-similar solutions may occur for magnetogasdynamic detonation waves, it is demonstrated that magnetogasdynamic shock waves do possess such solutions for which detailed flow patterns are presented.

Aluminum Particle Ignition Studies

2012 ◽  
Author(s):  
Michael S. Cornelius ◽  
Burl Donaldson
Keyword(s):  
Atmospheric Pressure ◽  
Molten Aluminum ◽  
Pressure Pulse ◽  
Aluminum Particle ◽  
Oxide Shell ◽  
Ignition Process ◽  
Particle Sizes ◽  
Aluminum Particles ◽  
Particle Ignition ◽  
Arc Heating

Experiments have been performed to study the combustion criteria of aluminum particles at atmospheric pressure. The primary goal is to quantify the outcome for a particle into which thermal energy has been deposited. Experiments utilized instantaneous joule heating of an aluminum wire. Once the particle was generated, it fell under gravity and the flight was recorded by video; in some cases, the ignited particle quenched or fragmented, and the residue was collected for SEM and EDS imaging. This provided information related to the aluminum oxide shell which was formed when combustion occurred. These experiments produced particles of approximately 150450 microns in the arc heating tests. In a second set of experiments, particles were produced under more observable time scales. This provided observation of the oxide skin, which is known to influence the ignition process. This experiment utilized a pressure pulse to eject a small droplet of molten aluminum through a small orifice. From this experiment, particle sizes ranging 2–3 mm were produced.

Sign in / Sign up

Export Citation Format

Share Document