Abstract
A piston compression process of a gun tunnel was calculated by the coupling analysis between the one-dimensional CFD and the equation of motion. In this study, the relationship between the piston property (corresponding to reciprocal of the non-dimensional piston mass), ε and the maximum piston position, xmax was investigated parametrically, at the initial pressure ratio of 10. In the case that ε is smaller than 0.06, xmax corresponds to the isentropic theory, i.e., heavy piston operation. On the other hand, in case of ε larger than 3, xmax corresponds to the multi reflection theory, i.e., light mass piston operation.
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