An Approximate Calculation Method for Ejection of Propellant Gas during After-effect Period of Artillery

doi:10.3969/j.issn.1000-1093.2021.07.005

Abstract

Abstract: The resultant force in the bore during after-effect period of artillery becomes significant in analyzing the motion of artillery. As the spatial distribution of propellant gas flow properties in the conventional theoretical assumption of after-effect period does not strictly conform to the numerical solutions, a set of differential-integral equations describing the gas flow distribution are derived from the governing equations of in-bore gas. A numerical method is then proposed for solving the equations. Formulas for evaluating the gas flow properties, the resultant force in the bore, and the after-effect coefficient are obtained based on the gas flow distribution. The calculated results of the formulas in this paper and the conventional theories were compared with the numerically simulated results.The results suggest that the gas flow distribution and the resultant force in the bore calculated by the proposed formulas are in fantastic agreement with the numerically simulated ones. The error between the analytical and computational after-effect coefficients ranges from 0.38% to 1.80%.

Key words: artillery, after-effectperiod, resultantforceinthebore, after-effectcoefficient, methodofseparationofvariables

CLC Number:

TJ012.2

MIAO Wei, YIN Qiang, QIAN Linfang. An Approximate Calculation Method for Ejection of Propellant Gas during After-effect Period of Artillery[J]. Acta Armamentarii, 2021, 42(7): 1381-1391.

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