To improve the plasticization quality and process safety of Modified Double-Base (MDB) propellants during the calendering process. This study, using actual physical parameters of MDB propellant, a three-dimensional thermo-fluid coupled model was developed to investigate the effects of process parameters on the heat and mass transfer behavior of MDB materials during the calendering process. By comparing the effects of different roller speed ratios, roller gaps, and roller speeds on the material's velocity, temperature, and viscosity distribution during the calendering process, it was found that the material forms an asymmetric vortex reflux movement during the calendering process. This unique flow characteristic is the primary reason for the material's asymmetric mass and heat transfer properties. Changes in the rotational speed ratio have a minor impact on the reflux movement but significantly affect process safety. A rotational speed ratio of 1.25 can effectively reduce the temperature of the material at the vortex center, thereby decreasing the risk of combustion. The smaller the roll gap, the higher the starting position of the material reflux. By selecting a roll gap of 0.8 mm, it's possible to effectively reduce the viscosity gradient while simultaneously decreasing the material's residence time. Increasing the rotation speed enhances the intensity of reflux. A speed setting of 20:15 not only reduces heat generated from shearing but also controls the temperature distribution range of the material, thereby enhancing the efficiency of the calendering production process. These adjustments in process parameters enhanced the safety and production efficiency of the MDB propellant calendering process, providing valuable insights for the safe production of MDB propellant calendering technology.

中文翻译：

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研究改性双基推进剂压延过程中的不对称质量和传热


提高改性双基（MDB）推进剂在压延过程中的塑化质量和工艺安全性。本研究利用MDB推进剂的实际物理参数，建立了三维热流耦合模型，研究压延过程中工艺参数对MDB材料传热传质行为的影响。通过比较不同辊速比、辊缝、辊速对压延过程中物料速度、温度和粘度分布的影响发现，物料在压延过程中形成不对称涡流回流运动。这种独特的流动特性是材料具有不对称传质和传热特性的主要原因。转速比的变化对回流运动影响较小，但会显着影响过程安全。 1.25的转速比可以有效降低涡流中心物料的温度，从而降低燃烧风险。辊缝越小，物料回流的起始位置越高。通过选择0.8毫米的辊缝，可以有效降低粘度梯度，同时减少材料的停留时间。提高转速可增强回流强度。 20:15的速度设置不仅减少了剪切产生的热量，而且控制了材料的温度分布范围，从而提高了压延生产过程的效率。 这些工艺参数的调整提高了MDB推进剂压延工艺的安全性和生产效率，为MDB推进剂压延技术的安全生产提供了宝贵的见解。