A rheological, mechanical and ballistic characterization of paraffin-based hybrid rocket fuels constituted the framework for this study. The aim was to understand and analyse paraffin-based fuel containing different particle sized aluminum powders in terms of rheological and mechanical behavior; and to further investigate the effect of particle sizes on the ballistic behavior of the energetic materials loaded with aluminium powders. Results of this research showed a strong correlation between the measured viscosity of the melted paraffin layer and the regression rate: a decrease in viscosity increases the regression rate. It was also observed that as particle size of additive decreases, viscosity increases; thus decreasing the regression rate. Furthermore, it was seen that reduction in viscosity could be achieved using a multimodal particle size distribution. The highest regression rate was found for the formulation containing Type III aluminum additive: at 2 g/mm2s oxygen mass flux. An increase of regression rate w.r.t pure gel wax formulations (upto 3.3 %) with regression rate value of 2.037 mm/s was obtained.
La caratterizzazione reologica, meccanica e balistica di combustibili basso-fondenti a base paraffinica per motori a razzo di tipo ibrido costituisce il quadro di riferimento per questo studio. Lo scopo è di comprendere e analizzare combustibili a base di paraffina contenenti polveri di alluminio di varie dimensioni in termini di comportamento reologico e meccanico e di indagare ulteriormente l'effetto delle dimensioni delle particelle sul comportamento balistico dei materiali energetici caricati con polveri di alluminio. I risultati di questa ricerca hanno dimostrato una forte correlazione tra la viscosità misurata dello strato di paraffina fuso e la velocità di regressione: una diminuzione della viscosità aumenta la velocità di regressione. Si è inoltre osservato che al diminuire delle dimensioni delle particelle di additivo aumenta la viscosità, diminuendo così la velocità di regressione. Inoltre, si è visto che la riduzione della viscosità potrebbe essere realizzata utilizzando una distribuzione granulometrica multimodale. Il tasso di regressione più alto è stato trovato per la formulazione contenente quale additivo polvere di alluminio di Tipo III, a 2 g/mm2 di flusso di massa di ossigeno. E’ stato misurato un aumento del tasso di regressione rispetto a formulazioni di cera (fino a 3.3%) con un valore di velocità di regressione di 2.037 mm/s.
Rheological, mechanical and ballistic characterization of aluminized paraffin-based fuels for hybrid space propulsion
MIR, RUMMAN
2015/2016
Abstract
A rheological, mechanical and ballistic characterization of paraffin-based hybrid rocket fuels constituted the framework for this study. The aim was to understand and analyse paraffin-based fuel containing different particle sized aluminum powders in terms of rheological and mechanical behavior; and to further investigate the effect of particle sizes on the ballistic behavior of the energetic materials loaded with aluminium powders. Results of this research showed a strong correlation between the measured viscosity of the melted paraffin layer and the regression rate: a decrease in viscosity increases the regression rate. It was also observed that as particle size of additive decreases, viscosity increases; thus decreasing the regression rate. Furthermore, it was seen that reduction in viscosity could be achieved using a multimodal particle size distribution. The highest regression rate was found for the formulation containing Type III aluminum additive: at 2 g/mm2s oxygen mass flux. An increase of regression rate w.r.t pure gel wax formulations (upto 3.3 %) with regression rate value of 2.037 mm/s was obtained.File | Dimensione | Formato | |
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RHEOLOGICAL, MECHANICAL AND BALLISTIC CHARACTERIZATION OF ALUMINIZED PARAFFIN-BASED FUELS FOR HYBRID SPACE PROPULSION by Rumman Mir.pdf
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Descrizione: The aim was to understand and analyse paraffin-based fuel containing different particle sized aluminum powders in terms of rheological and mechanical behavior; and to further investigate the effect of particle sizes on the ballistic behavior of the energetic materials loaded with aluminium powders.
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https://hdl.handle.net/10589/128141