改性双基推进剂剪切压延过程的数值模拟  

Numerical simulation of shear calendering process for modified double-base propellant

作　　者：英飞 薛晓俊 潘浩东 尹艳华 YING Fei;XUE Xiaojun;PAN Haodong;YIN Yanhua(Beijing Institute of Technology,Beijing 102488,China)

机构地区：[1]北京理工大学化学与化工学院,北京102488

出　　处：《固体火箭技术》2020年第4期497-505,共9页Journal of Solid Rocket Technology

摘　　要：剪切压延机在改性双基推进剂加工过程中的应用,解决了传统工艺生产间断,生产效率低,产品成品率低以及产品质量差的弊端,可以实现自动化、连续化生产,并且大大提高了混合效率和塑化性能。将计算流体动力学方法(CFD)方法引入到对改性双基推进剂剪切压延过程的研究中,使用Pro/Engineer软件建立剪切压延机的几何模型,使用HyperMesh软件对几何模型进行有限元网格划分,使用POLYFLOW软件建立该过程的数值模型并进行模拟计算,分析该过程的速度、压力、剪切速率、粘性生热、温度、混合指数等参数的分布规律,为实际设备和工艺的选择优化提供参考。根据数值模拟计算结果分析:改性双基推进剂药料在剪切压延机的辊隙区域受到两个辊筒旋转产生的较大的剪切挤压作用,该区域的压力、剪切速率、粘性热、混合指数明显高于其他区域;药料的最大混合指数可达0.88左右;药料的速度分布和剪切速率分布的均匀性较好,有利于提高产品成型质量,忽略进出口效应后,平均速度在0.376 m/s附近波动,最大剪切速率在25~30 s-1范围内波动;药料在一定温度和压力下完成塑化过程,剪切压延过程中温度和压力的变化较平稳,没有出现突变,工艺的安全性较高。The application of the shear calender in the processing of modified double-base propellant solves the shortcomings of traditional technology,such as intermittent production,low production efficiency,low product yield and poor product quality,which can realize automatic,continuous production,and greatly improve the mixing efficiency and plasticizing performance.In this paper,Computational Fluid Dynamics(CFD)method was introduced into the study on the shear calendering process of modified double-base propellant.Pro/Engineer software was used to establish the three-dimensional geometric model of the process and HyperMesh software was used to perform finite element meshing on geometric model.The simulation calculation was carried out using POLYFLOW software to analyze the distribution of parameters including velocities,pressure,shear rate,viscous heating,temperature and mixing index to provide a reference for the optimization of actual equipment and process.According to the calculation results of numerical simulation analysis,the modified double-base propellant medicinal material is subjected to the big shear squeezing action produced by the rotation of the two rollers in the roll gap area of the shear calender.The pressure,shear rate,viscosity heat and mixing index in this areais significantly higher than other regions.The maximum mixing index can be reached to 0.88.The uniformity of velocity distribution and shear rate distribution is good,which is beneficial to improve the molding quality of the product.After ignoring the import and export effect,the average velocity fluctuate around 0.376 m/s,and the maximum shear rate fluctuated within the range of 25~30 s-1.The temperature and pressure changes are relatively stable,which can improve the safety of the process.

关 键 词：改性双基推进剂 剪切压延 HYPERMESH POLYFLOW 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]