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

Journal Article · · Journal of Propulsion and Power
DOI:https://doi.org/10.2514/1.b36859· OSTI ID:1469624
 [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

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.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); SNL Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
NA0003525
OSTI ID:
1469624
Report Number(s):
SAND--2018-9674J; 667575
Journal Information:
Journal of Propulsion and Power, Journal Name: Journal of Propulsion and Power Journal Issue: 4 Vol. 34; ISSN 0748-4658
Publisher:
American Institute of Aeronautics and Astronautics (AIAA)Copyright Statement
Country of Publication:
United States
Language:
English

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  • Geisler, Robert
  • 38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit https://doi.org/10.2514/6.2002-3748
conference June 2012

Cited By (1)

Ultra-high-speed Pulse-burst Phase Conjugate Digital In-line Holography for Imaging Through Shock-wave Distortions conference January 2019

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