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The Extrusion molding is a critical process in the production of explosives and propellants. The Extrusion molding process for propellants typically includes a pressure filtration step, which not only removes impurities from the propellant material but also alters its rheological properties, ultimately affecting product quality. Limited by actual production conditions, online monitoring and testing of the flow and safety characteristics of the material during this process are challenging, making numerical simulation an important tool for analyzing and optimizing the process. However, systematic research on the flow characteristics of propellant materials during the pressure filtration process remains insufficient. In this study, a capillary rheometer was first used to test the rheological properties of the propellant material, and the parameters of its rheological model were fitted. On this basis, a dynamic model of the material flow process within the filter module’s single unit was established according to the physical model of the filtration die, and the finite volume method was employed to solve the governing equations. The results show that the propellant material exhibits shear-thinning characteristics, and its rheological behavior conforms to the Power Law rheological model. The maximum flow velocity of the material in the filter holes reaches 3.94 mm/s, approximatealy 10 times the pressing speed. The flow velocity of the material is fastest at the central filter hole and gradually decreases outward, with a maximum velocity deviation of 18.7%. The temperature distribution pattern of the material between different holes is consistent with the velocity distribution, with the highest temperature at the central part of the contraction section. The material pressure is highest at the edge filter holes and decreases toward the center, with a maximum pressure deviation of 2.53%.This work provides a powerful tool for observing and predicting the flow and safety characteristics of propellant materials during the pressure filtration process.

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Numerical Simulation of Pressure Filtration Flow Process in Propellant Material Processing

  • 会议论文

  • 发表日期：

    2026年

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  • Bo Zheng,
  • Bao Rong,
  • Xiaoli Dong,
  • Gaohui Li,
  • Xiaoting Rui

摘要

The Extrusion molding is a critical process in the production of explosives and propellants. The Extrusion molding process for propellants typically includes a pressure filtration step, which not only removes impurities from the propellant material but also alters its rheological properties, ultimately affecting product quality. Limited by actual production conditions, online monitoring and testing of the flow and safety characteristics of the material during this process are challenging, making numerical simulation an important tool for analyzing and optimizing the process. However, systematic research on the flow characteristics of propellant materials during the pressure filtration process remains insufficient. In this study, a capillary rheometer was first used to test the rheological properties of the propellant material, and the parameters of its rheological model were fitted. On this basis, a dynamic model of the material flow process within the filter module’s single unit was established according to the physical model of the filtration die, and the finite volume method was employed to solve the governing equations. The results show that the propellant material exhibits shear-thinning characteristics, and its rheological behavior conforms to the Power Law rheological model. The maximum flow velocity of the material in the filter holes reaches 3.94 mm/s, approximatealy 10 times the pressing speed. The flow velocity of the material is fastest at the central filter hole and gradually decreases outward, with a maximum velocity deviation of 18.7%. The temperature distribution pattern of the material between different holes is consistent with the velocity distribution, with the highest temperature at the central part of the contraction section. The material pressure is highest at the edge filter holes and decreases toward the center, with a maximum pressure deviation of 2.53%.This work provides a powerful tool for observing and predicting the flow and safety characteristics of propellant materials during the pressure filtration process.