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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN En Línea: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v7.i5.30
pages 383-397

EFFECT OF DIFFERENT FLASH-TUBE VENT-HOLE PATTERNS ON INTERIOR BALLISTIC PROCESSES OF IGNITION CARTRIDGE OF 120-MM MORTAR SYSTEM

Ragini Acharya
The Pennsylvania State University, PA, USA

SINOPSIS

The objective of this study is to determine the possibility for decreasing the axial pressure gradients in the ignition cartridge of a 120-mm mortar propulsion system. The theoretical model and numerical code developed by the authors for ignition cartridge performance prediction as a part of a 3-D mortar interior ballistics (3DMIB) code was utilized in this study. Results show the presence of strong pressure waves in the current design of the ignition cartridge during the combustion processes in the granular bed. It was found that this pressure-wave phenomenon depends strongly upon the hierarchy and magnitudes of mass discharge rates of hot combustion products exiting through the 20 circular vent holes on the flash tube, which varied significantly along axial direction even though the vent-holes are distributed evenly. The highly non-uniform discharge of combustion products from the flash tube into the granular bed is believed to be the main reason for generating strong pressure waves in the existing M1020 ignition cartridge. The vent-hole pattern on the flash tube was systematically modified to achieve a more uniform discharge of igniter products into the granular bed. Numerical results showed that significant reduction in axial pressure gradients can be obtained by modifying the flash tube vent-hole sizes such that the igniter products are discharged more evenly at various axial locations in the granular bed. The reduction of the axial pressure gradient in the ignition cartridge can improve the reliability and reproducibility of the 120-mm mortar propulsion system.

REFERENCIAS

  1. Kuo, K.K., Acharya, R., Ferrara, P.J., and Moore, J.D., Method of Characteristics Simulation of Interior Ballistic Processes of M1 020 Ignition Cartridge in a 120-mm Mortar System.

  2. Acharya, R. and Kuo, K.K., Finite Element Simulation of Interior Ballistic Processes in 120-mm Mortar System.

  3. Moore, J.D., Ferrara, P.J., and Kuo, K.K., Characterization of Combustion Processes in a Windowed Flash Tube of M1 020 Ignition Cartridge for 120-mm Mortar System.

  4. Shapiro, A.H., The Dynamics and Thermodynamics of Compressible Fluid Flow.

  5. Moore, J.D., Kuo, K.K, Acharya, R., and Ferrara, P.J., Characterization Combustion Processes and Different Vent-Hole Patterns in a Flash Tube of M1 020 Ignition Cartridge for 120-mm Mortar.


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