Interior Ballistic Characteristics of Combustion and Propulsion Process of Bulk-loaded Liquid Propellant

doi:10.3969/j.issn.1000-1093.2021.04.009

Abstract

Abstract: A gas-liquid two-phase flow and reaction mathematical model for the 12.7 mm small caliber launch device was established by ANSYS 2020. The proposed model is used to study the influences of pressure wave and Taylor Helmholtz instability effect on the internal ballistic performance during the combustion process of liquid propellants. The evolution characteristics of Taylor cavity gas-liquid interface during the combustion process of liquid propellant were obtained through simulation, and the mass fraction of components, evaporation rate of liquid propellant, chemical reaction rate and temperature contours were obtained as well. The simulated results show that the evaporation and combustion reactions mainly occur on the surface of Taylor cavity, and the reaction products diffuse to the whole cavity. At the same time, some wrinkles are found on the cavity surface because of Helmholtz instability effect. In the whole process of expansion, the axial expansion speed of the cavity is far greater than the radial expansion speed, and there are still many liquid propellants around the chamber. As a result, the stability of interior ballistics becomes worse and the pressure oscillation intensifies.

Key words: liquidpropellant, turbulentcombustion, Taylorcavity, numericalsimulation

CLC Number:

TJ012.1⁺5

JIANG Dongdong， XUE Xiaochun. Interior Ballistic Characteristics of Combustion and Propulsion Process of Bulk-loaded Liquid Propellant[J]. Acta Armamentarii, 2021, 42(4): 755-763.

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