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- W2591837709 abstract "In the recent past, the influence of steady acceleration fields on the combustion process of solid rocket propellants was analyzed in great details and nowadays a satisfactory knowledge of the related burning rate augmentation mechanisms has been reached. Theoretical models exist, capable of adequately fitting the experimental data for aluminized propellants. Aluminum and aluminum oxide agglomerates on the burning surface, playing the role of thermal short-circuit from the flame to the propellant grain, have been recognized responsible of burning rate augmentation. On the contrary, the influence of unsteady accelerations, for example due to vibrations experienced by motors during the launch phase, was never tested. The objective of this work is to discuss the results of the tests, conducted at the SPLab of Politecnico di Milano, on vibratory combustion of solid propellants. The industrial AP 5 solid boosters propellant was tested, together with a home made nano-aluminum based propellant. Two different set-ups were especially developed for this investigation: the first one limited to ambient pressure testing (Basic Set-up), the latter for testing under pressure (Pressure Set-up): in both set-ups an oscillatory motion is imposed to the burning strand. The results obtained at ambient pressure, for the AP 5 propellant, show a first peak of burning rate augmentation together with resonance peaks at frequencies multiple of the first one. Increasing pressure shifts all resonance peaks to higher frequencies. A possible explanation of this experimental trend is associated with the natural frequency of the propellant condensed phase thermalwave. The heat feedback from the gas phase to condensed phase is interrupted, once at every cycle of oscillation, when clusters of solid particles are expelled from the burning surface by inertial forces. For the nano-aluminum based propellant the results are still in a preliminary stage of investigation." @default.
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- W2591837709 date "2006-10-02" @default.
- W2591837709 modified "2023-09-24" @default.
- W2591837709 title "Aluminized Solid Propellants Combustion Under Vibratory Conditions" @default.
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- W2591837709 doi "https://doi.org/10.2514/6.iac-06-c4.3.01" @default.
- W2591837709 hasPublicationYear "2006" @default.
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