Combustion Stability of Interior Ballistics of Liquid Propellant Mortar

doi:10.3969/j.issn.1000-1093.2020.11.001

Abstract

Abstract: In order to explore the interior ballistic characteristics of liquid propellant mortar, a 60 mm liquid propellant mortar transient measurement system was developed to measure the pressure in combustion chamber and the muzzle velocity of mortar shell. Based on the experiment, a two-phase flow model with combustion reaction for liquid propellant mortar is established by using unsteady Eulerian-Lagrangian model and liquid propellant evaporation-combustion model. The coupling relationship between the complex gas phase flow field and the injection-combustion of liquid propellant as well as the formation mechanism of pressure oscillations are analyzed by simulating the reaction flow field during the interior ballistic process. The results show that the 60 mm liquid propellant mortar has excellent combustion stability. The numerically simulated results are in good agreement with the experimental results, where the experimental pressure oscillation is repeated, proving that the established model is reasonable and reliable. Both injection and combustion of liquid propellant are affected by gas vortex in combustion chamber. The concentrated combustion caused by the reflected waves makes the pressure appear as an oscillatory development.

Key words: liquidpropellantmortar, regenerativeliquidpropellantgun, pressureoscillation, combustion, reactionflowfield

CLC Number:

TJ012.1⁺5

SUN Mingliang, LU Lin, LIU Ning, ZHANG Xiangyan. Combustion Stability of Interior Ballistics of Liquid Propellant Mortar[J]. Acta Armamentarii, 2020, 41(11): 2145-2154.

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