Imaging Aluminum Particles in Solid-Propellant Flames Using 5 kHz LIF of Al Atoms

Vilmart, Gautier; Dorval, Nelly; Devillers, Robin; Fabignon, Yves; Attal‐Trétout, Brigitte; Bresson, Alexandre

doi:10.3390/ma12152421

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…In addition, 2D and 3D images can be obtained [310] with a resolution below the mm range [312]. LIF imaging has been applied in aqueous flows [313] and combustions of propellants [314], [315] detecting iron atoms [314] and aluminum atoms [315], however we contend that the low penetration of visible and UV radiation in an opaque sample would prevent its use on vaccines.…”

Section: ) Photodetector-based Sensorsmentioning

confidence: 99%

Metal Particle Detection Methods and Their Use for Freeze-Dried Vaccine Inspection: A Review

Jedlicki,

Tellbach,

Subirana

2024

IEEE Sensors J.

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We establish a set of metal particle detection methods that are suitable for automated inspection of freeze-dried vaccines. We first identify the requirements for freeze-dried vaccine inspection. We then assess metal particle detection methods obtained through a comprehensive literature review with the requirements for automated inspection. In particular, we find inductive sensors, superconducting quantum interference device (SQUID)-based sensors, giant magnetoresistive (GMR)/tunneling magnetoresistive (TMR)-based sensors, THz imaging, hyperspectral imaging, thermal imaging, X-ray inspection, and radio frequency identification (RFID)-based sensors promising for automated inspection of freeze-dried vaccines. However, experiments assessing the applicability of these methods for freeze-dried vaccine inspection are severly limited and future research is required to choose the best performing methods.

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Section: ) Photodetector-based Sensorsmentioning

confidence: 99%

Metal Particle Detection Methods and Their Use for Freeze-Dried Vaccine Inspection: A Review

Jedlicki,

Tellbach,

Subirana

2024

IEEE Sensors J.

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“…Al atoms produce a significant fluorescence signal that can be easily detected even with the harsh conditions of the solid-propellant flames (high-luminosity, high-pressure and heavily particle-laden environment). In our laboratory, metallic atoms such as iron and aluminum have been probed during solid-propellant combustion [11] [14]. Al-PLIF at high repetition-rate (5 kHz) was shown to be quite informative about the Al-droplet combustion process close to the propellant surface and above, during the short combustion duration (~1 s) of aluminized propellant samples [14].…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…In our laboratory, metallic atoms such as iron and aluminum have been probed during solid-propellant combustion [11] [14]. Al-PLIF at high repetition-rate (5 kHz) was shown to be quite informative about the Al-droplet combustion process close to the propellant surface and above, during the short combustion duration (~1 s) of aluminized propellant samples [14]. In the present work, simultaneous Al-vapor fluorescence and droplet emission images are recorded in order to improve analysis of Al droplets behaviour.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…High-resolution imaging of burning aluminium droplets was performed in a combustion chamber designed for optical diagnostics of solid-propellant flames up to a pressure of 1.5 MPa. The solid-propellant combustion chamber and the Al-PLIF setup were previously presented [14] [15]. The spectroscopic background of the Al atom was described in details elsewhere together with the choice for the excitation and detection scheme [16].…”

Section: A Plif and Visible-emission Imaging Setupmentioning

confidence: 99%

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Investigation of aluminum droplet combustion in solid propellant flames: Al-PLIF experiments and numerical simulation

Chevalier¹,

Dorval²,

Devillers³

et al. 2021

AIAA Propulsion and Energy 2021 Forum

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Aluminum-droplet combustion is studied in solid-propellant flame environment at 1.0 MPa. Al vapor is observed during the combustion process with high-speed Al-PLIF and visible-emission images. A onedimensional quasi-steady model of aluminum combustion is used to simulate Al-atom concentration and temperature profiles around the droplet. Al-PLIF image simulation has been developed to generate synthetic fluorescence images that reproduce the experimental images. A comparison approach is initiated between experimental and numerical Al-PLIF images and applied to the study of a specific droplet observed during the experiments with a diameter larger than 120 µm. A reasonable consistency is observed between simulated and experimental data, which is promising to provide validation data for the development of more representative aluminum-combustion models.

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“…The casting process becomes complicated if the viscosity of the AP/HTPB-based CSP slurry exceeds the viscosity limit, resulting in defects in the structure of CSP solids such as voids, porosity, voids with tails, craze, and cracks. As a result, the asymmetric combustion of CSP occurs, causing damage to the rocket motor [10,11]. Figure 1 shows examples of CSP solids with voids, detected using an X-ray.…”

Section: Introductionmentioning

confidence: 99%

Thixotropic Behavior in Defining Particle Packing Density of Highly Filled AP/HTPB-Based Propellant

et al. 2021

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An alarming, asymmetric flame in rocket combustion originates from a composite solid propellant (CSP) containing defects. The defects are the result of a composition that exceeds the maximum particle packing density. Based on the structure analysis of CSP, the addition of plasticizer causes the correlation between the viscosity of CSP slurry and particle packing density to become uncertain. This work aims to investigate the influence of thixotropic behavior on the maximum particle packing density of CSP. A CSP with different thixotropic behavior was successfully produced using aluminum/plasticizer dioctyl adipate (DOA) of 12–24. During the curing process, viscosity and stress–growth were investigated. The structure of the CSP was defined using X-ray radiography. It is remarkably observed that the peak of thixotropy occurred at the 15th minute of the curing process. The particle packing density of CSP can be decisive for the relative viscosity at the peak time of thixotropic behavior. The CSP with the highest relative viscosity at the peak time was revealed to have voids in the upper part of the CSP. Thus, this parameter was proven to change the preceding parameter, viscosity that was measured at the end of mixing. Based on the stress–growth analysis, it is conceivable that the mechanism involves the time-dependent diffusion of DOA in weakening aluminum agglomerates.

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Imaging Aluminum Particles in Solid-Propellant Flames Using 5 kHz LIF of Al Atoms

Cited by 9 publications

References 26 publications

Metal Particle Detection Methods and Their Use for Freeze-Dried Vaccine Inspection: A Review

Metal Particle Detection Methods and Their Use for Freeze-Dried Vaccine Inspection: A Review

Investigation of aluminum droplet combustion in solid propellant flames: Al-PLIF experiments and numerical simulation

Thixotropic Behavior in Defining Particle Packing Density of Highly Filled AP/HTPB-Based Propellant

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