| SC-CO2及工艺条件对高固含量发射药CA/CaCO3体系挤出停留时间的影响 |
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| 引用本文： | 熊奥①,阮建①,丁亚军①②,应三九①. SC-CO2及工艺条件对高固含量发射药CA/CaCO3体系挤出停留时间的影响[J]. 爆破器材, 2020, 49(5): 29-35,41. DOI: 10.3969/j.issn.1001-8352.2020.05.006 |
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| 作者姓名： | 熊奥① 阮建① 丁亚军①② 应三九① |
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| 作者单位： | ①南京理工大学化工学院（江苏南京,210094）②南京理工大学特种能源材料教育部重点实验室（江苏南京,210094） |
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| 摘 要： | 为了研究挤出过程中超临界二氧化碳（SC-CO2）对高固含量发射药停留时间分布的影响,采用示踪粒子轨迹跟踪技术研究了醋酸纤维素（CA）/碳酸钙（CaCO3）/SC-CO2代料停留时间的影响因素,结合反应器流动模型确定了CA/CaCO3/SC-CO2在机筒中的流动情况。数值模拟结果显示,注入体积流量为0.1 mL/min的SC-CO2后,平均停留时间缩短了35%,Pe减小了196.4;螺杆转速由6 r/min增加到14 r/min时,平均停留时间缩短了54.5%,Pe减小了210.8;当机筒温度从40 ℃升高至60 ℃,平均停留时间减少了19%,Pe减小了75.0。反应器流动模型拟合结果显示,螺杆转速由6 r/min增加到14 r/min时,CA/CaCO3/SC-CO2的体积分数从0.65降低到0.62。由此可知,SC-CO2的加入、螺杆转速的增加以及机筒温度的升高都显著缩短了物料的停留时间,并促进了轴向混合,CA/CaCO3/SC-CO2在螺杆内的主要流型为活塞流。
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| 关 键 词： | 高固含量发射药 超临界二氧化碳 停留时间 |
Effect of SC-CO2 and Process Conditions on Residence Time of High Solid Content Propellant Substitute in Extrusion |
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| XIONG Ao①,RUAN Jian①,DING Yajun①②,YING Sanjiu①. Effect of SC-CO2 and Process Conditions on Residence Time of High Solid Content Propellant Substitute in Extrusion[J]. Explosive Materials, 2020, 49(5): 29-35,41. DOI: 10.3969/j.issn.1001-8352.2020.05.006 |
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| Authors: | XIONG Ao① RUAN Jian① DING Yajun①② YING Sanjiu① |
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| Affiliation: | ① School of Chemical Engineering,Nanjing University of Science and Technology (Jiangsu Nanjing, 210094)② Key Laboratory of Special Energy Materials in Ministry of Education, Nanjing University of Science and Technology (Jiangsu Nanjing, 210094) |
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| Abstract: | In order to study the effect of supercritical carbon dioxide (SC-CO2) on the residence time distribution of high solid propellant in extrusion process, numerical simulation of CA/CaCO3/SC-CO2 substitutes was performed to analyze the influencing factors of residence time by particle tracing method. Combined with reactor flow pattern, the main flow patterns of CA/CaCO3/SC-CO2 in the barrel were determined. The results show that after injection of SC-CO2 with a volume flow of 0.1 mL/min, the mean residence time reduces by 35%, and the Pe?number reduces by 196.4. When the screw speed increases from 6 r/min to 14 r/min, the mean residence time reduces by 54.5%, and the Pe?number decreases 210.8. The mean residence time reduces by 19% and the Pe?number reduces by 75.0 when the cylinder temperature increases from 40℃ to 60℃. The fitting results show that the volume fraction of CA/CaCO3/SC-CO2 decreases from 0.65 to 0.62 as the screw speed increases from 6 r/min to 14 r/min. The residence time of the material is significantly shortened, the axial mixing is enhanced by the addition of SC-CO2, and the acceleration of screw speed and the increase in barrel temperature. Plug flow is the dominant flow pattern of CA/CaCO3/SC-CO2 in the screw. |
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| Keywords: | high solid content propellant supercritical carbon dioxide residence time |
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