Abstract
Interior ballistics are completed in tens of milliseconds, as are all gun-firing phenomena. Thus, some data cannot be measured directly through experimentation. Therefore, such complex gun-firing phenomena are traditionally clarified by numerical analysis. In the twophase flow of interior ballistics, interphase drag has a strong effect on propellant particle movement. This drag is a momentum sink in the gas phase and a corresponding source of momentum for the solid phase. Previous studies have calculated the drag force on the propellant particles using Ergun’s empirical equation, which was developed for a dense bed and relates the drag to the pressure drop through porous media. However, the particulate bed is fluidized in the course of the cycle of interior ballistics, thus indicating that the flow field is transient with regions of high Reynolds number beyond the range of experimental data. The Ergun equation is examined through a compensation study and calibrated based on the Reynolds number using the numerical method. Moreover, the influence of different drag models on flow behavior and propellant movement in interior ballistics is analyzed.
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Recommended by Associate Editor Hyoung-gwon Choi
Tae-Seong Roh received his B.S. and M.S. degrees in Aeronautical Engineering from Seoul National University in 1984 and 1986, respectively. He then went on to receive his Ph.D. from Pennsylvania State University in 1995. Dr. Roh is currently a Professor at the Department of Aerospace Engineering at Inha University in Incheon, Korea. His research interests are in the areas of combustion instabilities, rocket and jet propulsions, interior ballistics, and gas turbine engine defect diagnostics.
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Jang, JS., Oh, SH. & Roh, TS. Comparison of the characteristics of granular propellant movement in interior ballistics based on the interphase drag model. J Mech Sci Technol 28, 4547–4553 (2014). https://doi.org/10.1007/s12206-014-1022-5
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DOI: https://doi.org/10.1007/s12206-014-1022-5