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Study of aluminum particle combustion in solid propellant plumes using digital in-line holography and imaging pyrometry

Journal Article · · Combustion and Flame
The combustion of molten metals is an important area of study with applications ranging from solid aluminized rocket propellants to fireworks displays. Our work uses digital in-line holography (DIH) to experimentally quantify the three-dimensional position, size, and velocity of aluminum particles during combustion of ammonium perchlorate (AP) based solid-rocket propellants. Additionally, spatially resolved particle temperatures are simultaneously measured using two-color imaging pyrometry. To allow for fast characterization of the properties of tens of thousands of particles, automated data processing routines are proposed. In using these methods, statistics from aluminum particles with diameters ranging from 15 to 900 µm are collected at an ambient pressure of 83 kPa. In the first set of DIH experiments, increasing initial propellant temperature is shown to enhance the agglomeration of nascent aluminum at the burning surface, resulting in ejection of large molten aluminum particles into the exhaust plume. The resulting particle number and volume distributions are quantified. In the second set of simultaneous DIH and pyrometry experiments, particle size and velocity relationships as well as temperature statistics are explored. The average measured temperatures are found to be 2640 ± 282 K, which compares well with previous estimates of the range of particle and gas-phase temperatures. The novel methods proposed here represent new capabilities for simultaneous quantification of the joint size, velocity, and temperature statistics during the combustion of molten metal particles. The proposed techniques are expected to be useful for detailed performance assessment of metalized solid-rocket propellants.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
California Inst. of Technology; USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1356857
Alternate ID(s):
OSTI ID: 1413352
Report Number(s):
SAND2017--4477J; PII: S0010218017301505
Journal Information:
Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: C Vol. 182; ISSN 0010-2180
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Megahertz-rate shock-wave distortion cancellation via phase conjugate digital in-line holography journal February 2020
Reaction kinetics and a physical model of the charring layer by depositing Al 2 O 3 at ultra-high temperatures journal January 2018
Comparison of simulation and experiments for multimode aerodynamic breakup of a liquid metal column in a shock-induced cross-flow journal August 2019
Spatially focused microwave ignition of metallized energetic materials journal February 2020
Theoretical study on combustion of non-spherical particles in nano-aluminized propellant in air journal March 2019
Agglomerate Sizing in Aluminized Propellants Using Digital Inline Holography and Traditional Diagnostics journal July 2018
Ultra-high-speed Pulse-burst Phase Conjugate Digital In-line Holography for Imaging Through Shock-wave Distortions conference January 2019
Imaging Aluminum Particles in Solid-Propellant Flames Using 5 kHz LIF of Al Atoms journal July 2019

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