Oxidizer size distribution effects on propellant combustion

Renie, J.; Condon, J.A.; Osborn, J. R.

doi:10.2514/6.1978-981

Cited by 8 publications

(4 citation statements)

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“…A bellows was incorporated in the optical train, allowing for greater magnification. Further experiments were conducted with the single interference filter replaced by a series of Semrock filters (FF01-300/80-25 and FF01-315/ [15][16][17][18][19][20][21][22][23][24][25] to increase the signal-to-noise ratio for image quality [28].…”

Section: Flame Structurementioning

confidence: 99%

“…Composite propellants containing a single AP nominal size distribution have been shown to exhibit a clear relationship between flame type, particle size, and global propellant burning rate [13][14][15][16]. For a specific pressure, monomodal propellant burning rates increase as AP particle sizes decrease, although this effect diminishes as particles become very small [11,12,[14][15][16]. At the smaller particle sizes, the fine AP/binder matrix burns with a pseudo-premixed flame due to the intimate mixing of the fuel and oxidizer [2].…”

Section: Introductionmentioning

confidence: 99%

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Near-surface flame structure characterization of simplified ammonium perchlorate/hydroxyl-terminated polybutadiene compositions

Isert

Connell

Risha

et al. 2016

Combustion and Flame

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Simplified model propellant configurations, such as monomodal propellants, can be valuable in the development and validation of predictive numerical tools. These idealized experiments also yield insight into the effect of diffusion length scales on combustion, but comprehensive data covering a large range of diffusional length scales do not currently exist. Here, monomodal propellants with ammonium perchlorate (AP) particle sizes under 800 µm and AP pellets ported and filled with hydroxyl-terminated polybutadiene (HTPB) were used to systematically study the effect of diffusion length scales, or AP equivalent particle sizes) of up to 4.1 mm on flame structure. In general, burning rates increased with pressure and decreasing particle size, as expected. Burning rates for samples with particle sizes greater than 400 µm converged with AP monopropellant burning rate data above approximately 2 MPa, the AP low-pressure deflagration limit (LPDL). For a given pressure above the LPDL, burning rates eventually became constant for both increasing and decreasing particle sizes. Conversely, for a given pressure below the

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Section: Flame Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Near-surface flame structure characterization of simplified ammonium perchlorate/hydroxyl-terminated polybutadiene compositions

Isert

Connell

Risha

et al. 2016

Combustion and Flame

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“…In some gas-phase models, erosive burning near the surface of the propellant have been incorporated into a three-flame model to include the effect of the high-velocity gas flow [24,25]. Since real SCPs are have a wide distribution of AP particle sizes, models have been created to include a bimodal distribution of AP particles, for instance, the petite ensemble model, which also includes the temperature sensitivity of the SCP [26]. An analytical method based on pressure and temperature correlation has been developed to study the dependence of SCP deflagration rate on pressure and initial temperature [27] for SCPs.…”

Section: Introductionmentioning

confidence: 99%

A diffuse interface method for solid-phase modeling of regression behavior in solid composite propellants

Kanagarajan¹,

Quinlan²,

Runnels³

2022

Preprint

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Solid composite propellants (SCPs) are ubiquitous in the field of propulsion. In order to design and control solid SCP rocket motors, it is critical to understand and accurately predict SCP regression. Regression of the burn surface is a complex process resulting from thermo-chemical-mechanical interactions, often exhibitingextreme morphological changes and topological transitions. Diffuse interface methods, such as phase field (PF), are well-suited for modeling processes of this type, and offer some distinct numerical advantages over their sharp-interface counterparts. In this work, we present a phase-field framework for modelingthe regression of SCPs with varying species and geometry. We construct the model from a thermodynamic perspective, leaving the base formulation general. A diffuse-species-interface field is employed as a mechanism for capturing complex burn chemistry in a reduced-order fashion, making it possible to model regressionfrom the solid phase only. The computational implementation, which uses block-structured adaptive mesh refinement and temporal substepping for increased performance, is briefly discussed. The model is then applied to four test cases: (i) pure AP monopropellant, (ii) AP/PBAN sandwich, (iii) AP/HTPB sandwich,and (iv) spherical AP particles packed in HTPB matrix. In all cases, reasonable quantitative agreement is observed, even when the model is applied predictively (i.e., no parameter adjustment), as in the case of (iv). The validation of the proposed PF model demonstrates its efficacy as a numerical design tool for future SCP investigation.

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“…The particle size impacts the combustion properties [22] and the material processability [27]. It was also recognized that filling the propellant with small particles is beneficial to the mechanical properties [14,31,28].…”

Section: Introductionmentioning

confidence: 99%

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

et al. 2016

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The mechanical behavior and damage of highly filled elastomers such as propellants is studied experimentally. A model material made of a polyacrylate matrix filled with glass beads and energetic binders filled with ammonium perchlorate and HMX have been formulated. The focus is on materials containing micrometric size particles. The size of fillers was varied from a few microns to hundreds of microns in order to study the impact of the size of particles. The materials stress-strain responses and the volume changes during uniaxial tensile tests have been recorded. Microtomographic slices of strained samples have been obtained in order to look at the type of damage sustained by the acrylate/glass bead materials. It appears that in the presence of large particles, composites showing early prominent crack benefits from the addition of small particles, whereas composites showing well dispersed matrix/particle decohesion without large cracks show no change of behavior when small particles are added.

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Oxidizer size distribution effects on propellant combustion

Cited by 8 publications

References 0 publications

Near-surface flame structure characterization of simplified ammonium perchlorate/hydroxyl-terminated polybutadiene compositions

Near-surface flame structure characterization of simplified ammonium perchlorate/hydroxyl-terminated polybutadiene compositions

A diffuse interface method for solid-phase modeling of regression behavior in solid composite propellants

Effects of small particles on the mechanical behavior and on the local damage of highly filled elastomers

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