基于离散元的不同轴截面形状下沙柳颗粒致密成型研究
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摘要
为研究模具的结构形状对沙柳颗粒致密成型的影响,用离散元软件EDEM建立了沙柳颗粒模型,并将预先用Pro/E创建的3种不同结构的模具先后导入其中,在初始参数、条件设定完成后分别做了匀速压缩模拟。对比研究了3种模具下压缩力的做功,颗粒在竖直和水平方向的形变特征、受力过程,并通过后处理所得数据分析计算了各模具下成型燃料最终获得的密度和能量。结果表明:双弧度、双锥度、单锥度3种模具下压缩过程做功依次为48.86、56.93、66.02 J,燃料总能量分别是40.06、41.54、46.81 J,对应密度为1.23、1.19、1.17 g/cm3;竖直方向双弧度下燃料内部颗粒受到的接触力和发生的形变远大于其他两种模具,水平方向三者颗粒所受的接触力和发生的形变无太大差异;颗粒在3种模具下受到的粘接力均无明显不同,但各自所受的法向粘接力远大于切向粘接力。
In order to study the influence of the shape of the mold on the compact forming of the Salix granules,the Salix granule model was established by the discrete element software EDEM, and the molds of the three different structures previously created by Pro/E were introduced into it. After the parameters and conditions were set, a uniform compression simulation was performed. The work of compression force under three kinds of molds, the deformation characteristics of the particles in the vertical and horizontal directions, and the stress process were compared. The data obtained from the post-treatment data were used to calculate the final density and energy of the formed fuel under each mold. The results show that the work of compression in the double arc,double taper and single taper 3 is 48.86, 56.93, 66.02 J, and the total fuel energy is 40.06, 41.54, 46.81 J, and the corresponding density is 1.23, 1.19, 1.17 g/cm3; the contact force and deformation of the internal particles of the fuel in the vertical direction of the double arc are much larger than those of the other two kinds of molds,and the contact of the particles in the horizontal direction is 3. The force and the deformation occurred are not much different; the adhesion of the particles under the three molds is not significantly different, but the normal adhesion is much greater than the tangential adhesion.
In order to study the influence of the shape of the mold on the compact forming of the Salix granules,the Salix granule model was established by the discrete element software EDEM, and the molds of the three different structures previously created by Pro/E were introduced into it. After the parameters and conditions were set, a uniform compression simulation was performed. The work of compression force under three kinds of molds, the deformation characteristics of the particles in the vertical and horizontal directions, and the stress process were compared. The data obtained from the post-treatment data were used to calculate the final density and energy of the formed fuel under each mold. The results show that the work of compression in the double arc,double taper and single taper 3 is 48.86, 56.93, 66.02 J, and the total fuel energy is 40.06, 41.54, 46.81 J, and the corresponding density is 1.23, 1.19, 1.17 g/cm3; the contact force and deformation of the internal particles of the fuel in the vertical direction of the double arc are much larger than those of the other two kinds of molds,and the contact of the particles in the horizontal direction is 3. The force and the deformation occurred are not much different; the adhesion of the particles under the three molds is not significantly different, but the normal adhesion is much greater than the tangential adhesion.
引文
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[2]宁廷州,俞国胜,陈忠加,等.对辊柱塞式成型机设计与试验[J].农业机械学报,2016,47(5):203-210.
[3]陈忠加,俞国胜,王青宇,等.柱塞式平模生物质成型机设计与试验[J].农业工程学报,2015,31(19):31-38.
[4]刘圣勇,杨国峰,杨群发,等.螺杆挤压式生物质成型机优化设计与试验[J].农业机械学报,2010,41(7):96-100.
[5]陈国鹏,赵文智,何世雄,等.沙柳(Salix psammophila)丛生枝生物量最优分配与异速生长[J].中国沙漠,2016,36(2):357-363.
[6]张忠涛,王文亮,常建民.沙柳主要组分热解特性的TG-FTIR分析[J].东北林业大学学报,2016,44(6):49-52,62.
[7]Cundall P A.A computer model for simulating progressive,large-scale movements in blocky rock systems[C].The International Symposium on Rock Mechanics,Nancy,ISRM,1971.
[8]徐泳,孙其诚,张凌,等.颗粒离散元法研究进展[J].力学进展,2003(2):251-260.
[9]刘凯欣,高凌天.离散元法研究的评述[J].力学进展,2003(4):483-490.
[10]李震,高雨航,刘彭.沙柳细枝颗粒致密成型过程中的压缩方式[J].林业工程学报,2018,3(4):102-106.
[11]贾富国,姚丽娜,韩燕龙,等.基于离散元法的糙米匀料盘仿真优化设计[J].农业工程学报,2016,32(4):235-241.
[12]李震,俞国胜,曲迪.基于ANSYS的生物质液压成型机双锥度模具特性研究[J].东北农业大学学报,2013,44(11):132-136.
[13]王成军,贺鑫,章天雨,等.基于离散元素法的杨木颗粒筛分效率研究[J].林产工业,2017,44(4):16-19,30.
[14]孙娟,王喜明,贺勤.沙柳材物理力学性能及其测试方法的研究[J].林产工业,2012,39(2):57-59.
[15]刘凡一,张舰,李博,等.基于堆积试验的小麦离散元参数分析及标定[J].农业工程学报,2016,32(12):247-253.
[16]张涛,刘飞,赵满全,等.大豆种子与排种器接触物理参数的测定与离散元仿真标定[J].中国农业大学学报,2017,22(9):86-92.
[17]刘文政,何进,李洪文,等.基于离散元的微型马铃薯仿真参数标定[J].农业机械学报,2018,49(5):125-135,142.