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Your search keyword '"Otón-Martínez, R. A."' showing total 8 results
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4. One-Dimensional Modelling of Internal Ballistics.

Author

Monreal-González, G., Otón-Martínez, R. A., Velasco, F. J. S., García-Cascáles, J. R., and Ramírez-Fernández, F. J.

Subjects
*BALLISTICS, *COMBUSTION, *SOLID propellants, *EXPLOSIVES, *GAS-solid interfaces
Abstract

A one-dimensional model is introduced in this paper for problems of internal ballistics involving solid propellant combustion. First, the work presents the physical approach and equations adopted. Closure relationships accounting for the physical phenomena taking place during combustion (interfacial friction, interfacial heat transfer, combustion) are deeply discussed. Secondly, the numerical method proposed is presented. Finally, numerical results provided by this code (UXGun) are compared with results of experimental tests and with the outcome from a well-known zero-dimensional code. The model provides successful results in firing tests of artillery guns, predicting with good accuracy the maximum pressure in the chamber and muzzle velocity what highlights its capabilities as prediction/design tool for internal ballistics. [ABSTRACT FROM AUTHOR]

Published
2017
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7. Advances in the characterisation of reactive gas and solid mixtures under low pressure conditions.

Author

García-Cascales, J. R., Otón-Martínez, R. A., Velasco, F. J. S., Vera-García, F., Bentaib, A., and Meynet, N.

Subjects
*GAS-solid interfaces, *MIXTURES, *LOW pressure (Science), *DUST, *COMBUSTION, *TWO-phase flow
Abstract

This work describes the use of splitting methods in the analysis of reactive two-phase mixtures of gases and particles under conditions that make the source terms very stiff. In our particular case, these are low pressure, small particles, high solid concentration, and very dense solids. The gas phase is considered a perfect gas and the solid one is assumed to be incompressible. The integration of the source terms proposed seems to help tackle without difficulty the type of dust mobilisation and combustion problems studied: This consists of an implicitisation of the source term performed after the evaluation of the advection problem. Some numerical results are included; they correspond to a mobilisation of the mixture by means of shock, a mobilisation problem provoked by a rarefaction wave, and the combustion of tungsten-dust in a reacting atmosphere. An example of a 3D dust mobilisation sequence inside the vacuum vessel (VV) of the ITER (International Thermonuclear Experimental Reactor) completes this work. [ABSTRACT FROM AUTHOR]

Published
2014
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