温度对双基类发射药制备中成型压力及偏距的影响
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摘要
为定量分析温度与多孔发射药物料流动性之间的关系,通过改变挤压工艺参数(发射药物料预热温度、模具预热温度),研究其对发射药成型过程中压力、偏距的影响;通过对几组剪切速率、剪切黏度及温度的数据拟合,选取Bird-Carreau模型作为流变模型;借助Fluent软件对模具及发射药物料进行共轭传热分析,同时进行了一系列的挤压成型实验,得到了发射药物料流道内压力分布和针架的最大变形。模拟结果表明,随着发射药物料加热温度的升高,流场压力逐渐减小,模针的最大变形量减小,变化率为0. 009 mm/℃。实验结果表明,流场压力随着发射药物料加热温度的升高而降低,温度差值为5℃时的压力平均变化率为13. 5%;发射药的孔偏距也逐渐减小,变化率为0. 007 mm/℃,且都与温度呈线性递减趋势。
To quantitatively analyze the relationship between temperature and the fluidity of materials for multi-perforated gun propellant,the effect of temperature on the pressure and offset distance in forming process of gun propellant was studied through changing the extrusion process parameters(preheating temperature of the materials for gun propellant and preheating temperature of the mould). Through fitting several set of data about shear rate,shear viscosity and temperature,the Bird-Carreau model was chosen as the rheological model. Fluent software is used to do the conjugate heat transfer analysis between the mould and materials for the gun propellant. In addition,a series of extrusion forming tests are conducted to obtain the pressure distributes in the flow channel of materials for the gun propellant and the maximum deformation of the die pins. The simulation results show that with the rise of the heating temperature of the materials for gun propellant,the pressure of the flow field decreases gradually,the maximum deformation of the die pins decreases with a change rate of 0. 009 mm/℃. The experimental results show that the pressure of the flow field decreases with the increase of heating temperature for gun propellant,and its average change rate of pressure is 13. 5% when the temperature difference is 5℃. The hole offset distance of gun propellant decreases also gradually and the change rate is 0. 007 mm/℃,and it reveals a linear decreasing trend with temperature.
To quantitatively analyze the relationship between temperature and the fluidity of materials for multi-perforated gun propellant,the effect of temperature on the pressure and offset distance in forming process of gun propellant was studied through changing the extrusion process parameters(preheating temperature of the materials for gun propellant and preheating temperature of the mould). Through fitting several set of data about shear rate,shear viscosity and temperature,the Bird-Carreau model was chosen as the rheological model. Fluent software is used to do the conjugate heat transfer analysis between the mould and materials for the gun propellant. In addition,a series of extrusion forming tests are conducted to obtain the pressure distributes in the flow channel of materials for the gun propellant and the maximum deformation of the die pins. The simulation results show that with the rise of the heating temperature of the materials for gun propellant,the pressure of the flow field decreases gradually,the maximum deformation of the die pins decreases with a change rate of 0. 009 mm/℃. The experimental results show that the pressure of the flow field decreases with the increase of heating temperature for gun propellant,and its average change rate of pressure is 13. 5% when the temperature difference is 5℃. The hole offset distance of gun propellant decreases also gradually and the change rate is 0. 007 mm/℃,and it reveals a linear decreasing trend with temperature.
引文
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[9]柳天磊,杜遥雪.基于POLYFLOW的管道黏弹性流体流动数值模拟[J].五邑大学学报(自然科学版),2010,24(4):7-11.LIU Tian-lei,DU Yao-xue. Numerical simulation of a viscoelastic fluid in a square pipe based on POLY-FLOW[J]. Journal of Wuyi University(Natural Science Edition),2010,24(4):7-1.
[2]韩博.高增面性大弧厚硝基胍发射药工艺技术研[D].南京:南京理工大学,2009.HAN Bo. Studies on process technology of high progressive and large web NQ-based gun propellant[D].Nanjing:Nanjing University of Science&Technology,2009.
[3]陈富华,胡小秋,刘志涛.基于有限元分析Workbench软件的多孔发射药挤压过程仿真分析[J].兵工学报,2017,38(4):695-703.CHEN Fu-hua,HU Xiao-qiu,LIU Zhi-tao. Workbench-based simulation analysis of multi-perforated gun propellant in extrusion process[J]. Acta Armamentarii,2017,38(4):695-703.
[4]张丹丹.发射药挤出成型过程的数值模拟研究[D].南京:南京理工大学,2015.ZHANG Dan-dan. Study of the extrusion simulation of propellant[D]. Nanjing:Nanjing University of Science&Technology,2015.
[5]何文斌,曾攀,张磊,等.基于有限元的400 MN大型模锻压力机温度场分析[J].机械工程学报,2015,51(2):30-36.HE Wen-bin,ZENG Pan,ZHANG Lei,et al. Temperature field analysis of 400MN heavy die forging press based on finite element method[J]. Journal of Mechanical Engineering,2015,51(2):30-36.
[6]王计广.基于Fluent的汽车消声器压力场及温度场数值分析[J].汽车工程师,2011(6):30-33.WANG Ji-guang. Numerical analysis of pressure field and temperature field in engine muffler based on Fluent[J].Auto Engineer,2011(6):30-33.
[7]季丹丹,刘志涛,廖昕,等. 19孔发射药挤出过程的数值模拟与模具优化[J].含能材料,2016,24(11):1114-1120.JI Dan-dan,LIU Zhi-tao,LIAO Xin,et al. Numerical simulation and die optimization of 19-hole propellant in extrusion process[J]. Chinese Journal of Energetic Materials,2016,24(11):1114-1120.
[8]柴俊,马忠亮.七孔变燃速发射药挤出胀大的模拟[J].四川兵工学报,2015,36(4):124-126.CHAI Jun,MA Zhong-liang. Extrusion swelling numerical simulation of co-extrusion process of variable-burning rate propellant[J]. Journal of Sichuan Ordnance,2015,36(4):124-126.
[9]柳天磊,杜遥雪.基于POLYFLOW的管道黏弹性流体流动数值模拟[J].五邑大学学报(自然科学版),2010,24(4):7-11.LIU Tian-lei,DU Yao-xue. Numerical simulation of a viscoelastic fluid in a square pipe based on POLY-FLOW[J]. Journal of Wuyi University(Natural Science Edition),2010,24(4):7-1.