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多腔室连续混合工艺及结构参数对压力及剪切力影响的模拟
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西安近代化学研究所

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Simulation of the Influence of Multi-Chamber Continuous Mixing Process and Structural Parameters on Pressure and Shear Stress
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1.Xi'2.'3.an Modern Chemistry Research Institute

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    摘要:

    为强化对多腔室混合工艺安全性的认识,以某浇注PBX为对象,建立了基于欧拉方法的多腔室捏合机内多组分物料连续混合的多相流CFD数值模型,并开展试验验证了模型的可靠性。基于模型研究了桨叶转速、捏合间隙、桨叶构型等关键工艺及结构参数对混合安全刺激量的影响规律。结果表明,从进料腔室到出料腔室,各腔室内的压力水平逐渐降低;增大桨叶转速有利于降低腔室内的压力,但剪切刺激明显增强,随着桨叶转速从15 r·min-1增加至75 r·min-1,捏合机内的峰值压力从402966 Pa减小至258107 Pa,峰值剪切力从6268.5 Pa增大至16607.9 Pa;增大捏合间隙明显降低了腔室内的压力及剪切力,随着捏合间隙从1 mm增加至5 mm,捏合机内的峰值压力从391094 Pa减小至284478 Pa,峰值剪切力从8320.5 Pa减小至3982.6 Pa;相较于两翼-两翼型桨叶,四翼-两翼型桨叶由于具有更多的捏合位点会产生更强的剪切刺激,但桨叶翼型对捏合压力的影响较小,腔室1~7采用四翼-两翼型桨叶及两翼-两翼型桨叶时,捏合机内的峰值剪切力分别为7481.3 Pa和4518.1 Pa。

    Abstract:

    To enhance the understanding of safety of multi-chamber mixing processes, a multiphase flow CFD numerical model based on the Eulerian method was established for the continuous mixing of multi-component materials in a multi-chamber kneader, taking a cast polymer bonded explosive (PBX) as the object. Experimental verification was conducted to confirm the reliability of the model. Based on the model, the influence laws of key process and structural parameters including blade rotation speed, kneading clearance and blade profile on the mixing safety stimulus were studied. The results show that the pressure level gradually decreased from the feeding chamber to the discharging chamber. Increasing the blade rotation speed was beneficial for reducing the pressure in the chambers, but the shear stimulus significantly increased. As the blade rotation speed increased from 15 r·min-1 to 75 r·min-1, the peak pressure in the kneader decreased from 402966 Pa to 258107 Pa, and the peak shear stress increased from 6268.5 Pa to 16607.9 Pa. Increasing the kneading clearance significantly reduced the pressure and shear stress in the chambers. As the kneading clearance increased from 1 mm to 5 mm, the peak pressure in the kneader decreased from 391094 Pa to 284478 Pa, and the peak shear stress decreases from 8320.5 Pa to 3982.6 Pa. Compared with the two-wing-two-wing blades, four-wing-two-wing blades produced stronger shear stimuli due to more kneading sites, but the blade profile had a smaller impact on the kneading pressure. When the four-wing-two-wing blades and two-wing-two-wing blades were used in chambers 1-7, the peak shear stresses in the kneader were 7481.3 Pa and 4518.1 Pa, respectively.

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樊超,李博豪,张彭超,等. 多腔室连续混合工艺及结构参数对压力及剪切力影响的模拟[J]. 含能材料,DOI:10.11943/CJEM2025055.

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  • 收稿日期: 2025-04-02
  • 最后修改日期: 2025-07-12
  • 录用日期: 2025-07-21
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