Influence of thermo-mechanical loading rate on aluminum particle ignition dynamics

2020 ◽  
Author(s):  
Valery. A. Babuk ◽  
Nikita L. Budnyi
Keyword(s):  
Mechanical Loading ◽  
Loading Rate ◽  
Aluminum Particle ◽  
Particle Ignition ◽  
Ignition Dynamics

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.

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.

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

Net Transport in the Intervertebral Disc is Dependent on Mechanical Loading Rate

2013 ◽  
Vol 13 (9) ◽  
pp. S55
Author(s):  
Sarah E. Linley ◽  
Josh Peterson ◽  
Rosemarie Mastropolo ◽  
Timothy T. Roberts ◽  
Sarah Frank ◽  
...  
Keyword(s):  
Intervertebral Disc ◽  
Mechanical Loading ◽  
Loading Rate

Aluminum particle ignition in different oxidizing environments

2010 ◽  
Vol 157 (7) ◽  
pp. 1356-1363 ◽  
Author(s):  
Salil Mohan ◽  
Luc Furet ◽  
Edward L. Dreizin
Keyword(s):  
Aluminum Particle ◽  
Particle Ignition

Loading-Rate Dependent Cell Injury: A Design Criterion for Engineered Tissue Constructs

2000 ◽  
Vol 6 (S2) ◽  
pp. 984-985
Author(s):  
Kenneth A. Barbee
Keyword(s):  
Mechanical Loading ◽  
Cell Injury ◽  
Loading Rate ◽  
Design Criterion ◽  
Mechanical Stimuli ◽  
Structural Adaptation ◽  
Mechanical Environment ◽  
Tissue Constructs ◽  
Wide Range ◽  
Engineered Tissue

Vascular endothelial cells experience a wide range of mechanical stimuli in vivo, including dynamic stretching and time-varying shear stress due to pulsatile blood flow. Under physiologic conditions, these hemodynamic forces constitute an important component of the cells' environment and are necessary for the normal maintenance of the structure and function of the vessel wall. Implantation of artificial vascular graft materials can significantly alter the mechanical environment of the cell. Furthermore, an important design criterion for engineered tissue constructs is the production of a mechanical environment that, ideally, stimulates normal growth and structural adaptation and. At least, avoids extremes in mechanical loading that might cause cellular trauma. In this paper, we investigate the mechanical loading conditions associated with normal and pathological mechanotransduction and cellular injury with an emphasis on the loading rate dependence of the cellular responses.A custom designed cone-and-plate device] allows arbitrary cone velocity waveforms to be generated.

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