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

Abstract

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

A strategy for modulating the catalytic active center of AP thermal decomposition and its application: La-doped MgCo2O4

“…Ammonium perchlorate (AP) is the most commonly used oxidizer in modern CSPs (60-90% of the total weight of CSPs), and its thermal decomposition behavior determines the combustion performance of CSPs. [4][5][6] Therefore, the improvement of combustion performance by optimizing the thermal decomposition temperature, heat release, activation energy, and reaction rate of AP has received considerable attention. 7,8 Nanocatalysts have become an integral part of CSPs as an effective strategy for signicantly enhancing the thermal decomposition performance of AP.…”

Nitrocellulose‐Based Green‐Light Illuminants: A Study of Barium Nitrate Particle Size on Spectral Performance

“…It should be noted that for oxidizers used in propellant formulations, such as ammonium perchlorate (AP), the particle size effect on combustion performance and the burning rate has been well studied. These studies investigated AP over a range of particle sizes in monomodal [12,13], bimodal [14,15], and trimodal [16,17] composite propellants.…”

Potential Applications of Magnetic β-AgVO3/ZnFe2O4 Nanocomposites in Dyes, Photocatalytic Degradation, and Catalytic Thermal Decomposition of Ammonium Perchlorate

“…The combustion properties of the propellants is affected by their thermal decomposition characteristics. In general, the combustion behavior of the solid propellants, and particularly their combustion rate, are significantly affected by the activation energy, reaction rate, and thermal decomposition temperature of the AP. − In this regard, different additives have been employed to improve the AP decomposition. It is worth mentioning that the additives characteristics are determined by their chemical composition as well as their structure, morphology, size, phase, and size distribution. − …”