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Title: Agglomerate Sizing in Aluminized Propellants Using Digital Inline Holography and Traditional Diagnostics

Aluminized ammonium perchlorate composite propellants can form large molten agglomerated particles that may result in poor combustion performance, slag accumulation, and increased two-phase flow losses. Quantifying agglomerate size distributions are needed to gain an understanding of agglomeration dynamics and ultimately design new propellants for improved performance. Due to complexities of the reacting multiphase environment, agglomerate size diagnostics are difficult and measurement accuracies are poorly understood. To address this, the current paper compares three agglomerate sizing techniques applied to two propellant formulations. Particle collection on a quench plate and backlit videography are two relatively common techniques, whereas digital inline holography is an emerging alternative for three-dimensional measurements. Atmospheric pressure combustion results show that all three techniques are able to capture the qualitative trends; however, significant differences exist in the quantitative size distributions and mean diameters. For digital inline holography, methods are proposed that combine temporally resolved high-speed recording with lower-speed but higher spatial resolution measurements to correct for size–velocity correlation biases while extending the measurable size dynamic range. Finally, the results from this work provide new guidance for improved agglomerate size measurements along with statistically resolved datasets for validation of agglomerate models.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2]
  1. Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Engineering Sciences Center
Publication Date:
Report Number(s):
SAND-2018-9674J
Journal ID: ISSN 0748-4658; 667575
Grant/Contract Number:
NA0003525
Type:
Accepted Manuscript
Journal Name:
Journal of Propulsion and Power
Additional Journal Information:
Journal Volume: 34; Journal Issue: 4; Journal ID: ISSN 0748-4658
Publisher:
American Institute of Aeronautics and Astronautics (AIAA)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); SNL Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING
OSTI Identifier:
1469624

Powell, Michael S., Gunduz, Ibrahim W., Shang, Weixiao, Chen, Jun, Son, Steven F., Chen, Yi, and Guildenbecher, Daniel R.. Agglomerate Sizing in Aluminized Propellants Using Digital Inline Holography and Traditional Diagnostics. United States: N. p., Web. doi:10.2514/1.b36859.
Powell, Michael S., Gunduz, Ibrahim W., Shang, Weixiao, Chen, Jun, Son, Steven F., Chen, Yi, & Guildenbecher, Daniel R.. Agglomerate Sizing in Aluminized Propellants Using Digital Inline Holography and Traditional Diagnostics. United States. doi:10.2514/1.b36859.
Powell, Michael S., Gunduz, Ibrahim W., Shang, Weixiao, Chen, Jun, Son, Steven F., Chen, Yi, and Guildenbecher, Daniel R.. 2018. "Agglomerate Sizing in Aluminized Propellants Using Digital Inline Holography and Traditional Diagnostics". United States. doi:10.2514/1.b36859. https://www.osti.gov/servlets/purl/1469624.
@article{osti_1469624,
title = {Agglomerate Sizing in Aluminized Propellants Using Digital Inline Holography and Traditional Diagnostics},
author = {Powell, Michael S. and Gunduz, Ibrahim W. and Shang, Weixiao and Chen, Jun and Son, Steven F. and Chen, Yi and Guildenbecher, Daniel R.},
abstractNote = {Aluminized ammonium perchlorate composite propellants can form large molten agglomerated particles that may result in poor combustion performance, slag accumulation, and increased two-phase flow losses. Quantifying agglomerate size distributions are needed to gain an understanding of agglomeration dynamics and ultimately design new propellants for improved performance. Due to complexities of the reacting multiphase environment, agglomerate size diagnostics are difficult and measurement accuracies are poorly understood. To address this, the current paper compares three agglomerate sizing techniques applied to two propellant formulations. Particle collection on a quench plate and backlit videography are two relatively common techniques, whereas digital inline holography is an emerging alternative for three-dimensional measurements. Atmospheric pressure combustion results show that all three techniques are able to capture the qualitative trends; however, significant differences exist in the quantitative size distributions and mean diameters. For digital inline holography, methods are proposed that combine temporally resolved high-speed recording with lower-speed but higher spatial resolution measurements to correct for size–velocity correlation biases while extending the measurable size dynamic range. Finally, the results from this work provide new guidance for improved agglomerate size measurements along with statistically resolved datasets for validation of agglomerate models.},
doi = {10.2514/1.b36859},
journal = {Journal of Propulsion and Power},
number = 4,
volume = 34,
place = {United States},
year = {2018},
month = {4}
}