Heterogeneous solid propellants: from microstructure to macroscale properties

Gallier, Stany

doi:10.1051/eucass/201102021

Cited by 1 publication

(1 citation statement)

References 21 publications

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“…The use of packing codes overcomes these problems. Some novel theoretical works can be found in the literature by Bandera et al [17], Maggi et al [18] as well as by Gallier et al [19]. All of these references include experimental data used for the validation of agglomeration models.…”

Section: Investigation On Microstructurementioning

confidence: 99%

Agglomeration in solid rocket propellants: novel experimental and modeling methods

Maggi

Bandera

Luca

et al. 2011

Progress in Propulsion Physics

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Metal agglomeration is a key factor a¨ecting the performance of metalized solid propellant rockets since many of the mechanisms that degrade speci¦c impulse can be ascribed to metal powder aggregation and agglomeration. Condensed combustion products are generated at or near the burning surface of the propellant and then released in the gas phase where they are shaped by the core §ow viscous forces and oxidized by the reactive environment. On this basis, detailed information about the size of agglomerates as they are generated from the propellant may improve the knowledge of the core §ow and, thus, the prediction of its e¨ects (namely, two-phase §ow losses). This topic entails both modeling and experimental activities, and the aim of this work is to present some recent developments achieved at the Space Propulsion Laboratory in cooperation with other international institutions. The experimental part shows the application of high-speed and high-resolution imaging of propellant combustion for automated measurement of particle size exploited by means of an ad-hoc image processing tool. The modeling part demonstrates how heterogeneity can explain the agglomeration by means of a pocket model using spatial statistics and two-(2D) or threedimensional (3D) virtual propellants. A de¦nition of a characteristic time that ¦ts the agglomeration data for tested propellants is suggested, and a method for predicting the agglomerate size is given. Both activities are still a matter of research but the maturity level reached so far permits the application in some practical cases. Progress in Propulsion Physics2 (2011) 81-98

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Section: Investigation On Microstructurementioning

confidence: 99%