Time-resolved size, velocity, and temperature statistics of aluminum combustion in solid rocket propellants

Marsh, Andrew W.; Wang, Gwendolyn T.; Heyborne, Jeffery D.; Guildenbecher, Daniel Robert; Mazumdar, Yi Chen

doi:10.1016/j.proci.2020.08.010

Cited by 46 publications

(16 citation statements)

References 24 publications

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“…In recent efforts, techniques such as digital inline holography have provided detailed characterization of the aluminum size distribution during propellant strand burns [23]. Unlike videography techniques, digital in-line holography (DIH) overcomes focal depth issues and provides statistical analysis from a small number of experiments by capturing individual particle sizes and trajectories [51,49,23,91].…”

Section: Literature Reviewmentioning

confidence: 99%

“…Such approaches can be used with multiple sensors using particular color filters corresponding to atomic emission lines or pyrometry emission bands. High-speed 2D imaging was used to capture particle temperatures in propellant flames using pyrometery [23,91].…”

Section: Continuum Emission From Particulatesmentioning

confidence: 99%

“…Pyrometry involves using two or more wavelengths to infer the temperature of continuum emission, which is approximated by black body or gray body emission for wavelengthindependent emissivities. This technique has been widely applied to measure particle temperatures from pulverized-coal flames [60], in thermal plasma jets [92], and in metalized propellant flames [42,23,91]. Pyrometry information can be collected via imaging in heterogeneous environments, recording via several photodetectors or imaging sensors.…”

Section: Two-color Pyrometrymentioning

confidence: 99%

“…Second, DIH is a field measurement, allowing simultaneous capture of multiple particles of interest and potentially decreasing the requirements for experimental duration and number of burns. DIH has been used to measure particle sizes and velocity in propellants previously [23,91]. However, as discussed, variations in propellant composition can lead to significant changes in the size of aluminum agglomerate size distributions [129].…”

Section: Digital In-line Holography For Particle Sizes and Velocitiesmentioning

confidence: 99%

“…In addition, simultaneous high-speed DIH and two-color pyrometry measurements showed the aluminum droplet size had a peak around 30 µm (corresponding to the initial size) but also exhibited agglomerate sizes from 70 to 300 µm (bi-modal) due to the agglomerate melt diameter being larger than aluminum particles as shown in Figure2.11(b). Particles were resolved at sizes down to 15 µm, and the high-speed data allowed for simultaneous correlations of temperature and size[23,91].…”

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Optical measurements in multiphase combustion

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Section: Literature Reviewmentioning

confidence: 99%

Section: Continuum Emission From Particulatesmentioning

confidence: 99%

Section: Two-color Pyrometrymentioning

confidence: 99%

Section: Digital In-line Holography For Particle Sizes and Velocitiesmentioning

confidence: 99%

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Optical measurements in multiphase combustion

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In Situ Cutting of Ammonium Perchlorate Particles by Co‐Bipy “scalpel” for High Efficiency Thermal Decomposition

et al. 2022

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Burning rate of solid propellants can be effectively improved by adding catalysts and using smaller size ammonium perchlorate (AP). Although few reports, the exploration of changing the size of AP primary particles by catalysts is of great significance for improving combustion performance. Here, taking Co-bipy as an example, the potential advantages of such materials as AP decomposition catalysts are reported. Due to the existence of NO 3 − combined with oxygen rich environment provided by AP, the structural self-transformation from micronrods to nanoparticles can be quickly realized during the heating process. More importantly, when Co-bipy decomposes, it can play the role of "scalpel" and in situ cut AP particles. Results show that high-temperature decomposition of Co-bipy/AP occurs at 305.8 °C, which is 137.5 °C lower than that of pure AP. Catalytic mechanism is discussed by in situ IR and TG-IR, CoO can effectively increase the content of reactive oxygen species and weaken the N-H bond, realizing the rapid oxidation of NH 3 . Eventually, the behavior of Co-bipy cutting AP particles is tested. This interesting catalyst structure self-transformation behavior can not only realize the influence on AP, but also perform a positive function in the combustion process of solid propellants, such as opening the adhesive AP interface.

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