The 2D sandwich model serves as a potent tool in exploring the influence of surface geometry on the combustion attributes of Ammonium perchlorate/Hydroxyl-terminated polybutadiene(AP/HTPB)propellant under rapid pressu...The 2D sandwich model serves as a potent tool in exploring the influence of surface geometry on the combustion attributes of Ammonium perchlorate/Hydroxyl-terminated polybutadiene(AP/HTPB)propellant under rapid pressure decay.The thickness of the sandwich propellant is derived from slicing the 3D random particle packing,an approach that enables a more effective examination of the micro-flame structure.Comparative analysis of the predicted burning characteristics has been performed with experimental studies.The findings demonstrate a reasonable agreement,thereby validating the precision and soundness of the model.Based on the typical rapid depressurization environment of solid rocket motor(initial combustion pressure is 3 MPa and the maximum depressurization rate is 1000 MPa/s).A-type(a flatter surface),B-type(AP recesses from the combustion surface),and C-type(AP protrudes from the combustion surface)propellant combustion processes are numerically simulated.Upon comparison of the evolution of gas-phase flame between 0.1 and 1 ms,it is discerned that the flame strength and form created by the three sandwich models differ significantly at the beginning stage of depressurization,with the flame structures gradually becoming harmonized over time.Conclusions are drawn by comparison extinction times:the surface geometry plays a pivotal role in the combustion process,with AP protrusion favoring combustion the most.展开更多
印刷企业为防止订单状况多、管控疏漏等问题,提升生产效率,大多引入高级计划排程APS(Advanced Planning and Scheduling)系统,全盘考虑印刷企业内外资源与能力,实现企业生产管理的全局优化目标。本文论述并讨论了APS高级计划排程系统在...印刷企业为防止订单状况多、管控疏漏等问题,提升生产效率,大多引入高级计划排程APS(Advanced Planning and Scheduling)系统,全盘考虑印刷企业内外资源与能力,实现企业生产管理的全局优化目标。本文论述并讨论了APS高级计划排程系统在软包装印刷企业中的应用情况和发展趋势,并针对APS在软包装印刷企业中的应用,提出了基于系统集成和生产线建模的APS印刷车间场景建模方法,希望能对未来的相关研究起到借鉴作用。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51176076)。
文摘The 2D sandwich model serves as a potent tool in exploring the influence of surface geometry on the combustion attributes of Ammonium perchlorate/Hydroxyl-terminated polybutadiene(AP/HTPB)propellant under rapid pressure decay.The thickness of the sandwich propellant is derived from slicing the 3D random particle packing,an approach that enables a more effective examination of the micro-flame structure.Comparative analysis of the predicted burning characteristics has been performed with experimental studies.The findings demonstrate a reasonable agreement,thereby validating the precision and soundness of the model.Based on the typical rapid depressurization environment of solid rocket motor(initial combustion pressure is 3 MPa and the maximum depressurization rate is 1000 MPa/s).A-type(a flatter surface),B-type(AP recesses from the combustion surface),and C-type(AP protrudes from the combustion surface)propellant combustion processes are numerically simulated.Upon comparison of the evolution of gas-phase flame between 0.1 and 1 ms,it is discerned that the flame strength and form created by the three sandwich models differ significantly at the beginning stage of depressurization,with the flame structures gradually becoming harmonized over time.Conclusions are drawn by comparison extinction times:the surface geometry plays a pivotal role in the combustion process,with AP protrusion favoring combustion the most.
文摘印刷企业为防止订单状况多、管控疏漏等问题,提升生产效率,大多引入高级计划排程APS(Advanced Planning and Scheduling)系统,全盘考虑印刷企业内外资源与能力,实现企业生产管理的全局优化目标。本文论述并讨论了APS高级计划排程系统在软包装印刷企业中的应用情况和发展趋势,并针对APS在软包装印刷企业中的应用,提出了基于系统集成和生产线建模的APS印刷车间场景建模方法,希望能对未来的相关研究起到借鉴作用。
