基于逆向工程的混肥搅拌器重构及CFD模拟
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摘要
以灌溉施肥系统重要组成部分混肥搅拌器为研究对象,基于逆向工程技术,对搅拌器叶片进行三维重构和偏差分析,结果显示:重构叶片曲面90%以上区域精度达到±0.1 mm。基于ICEM软件对搅拌器流场域进行建模和非结构网格划分,采用多重参考系法、欧拉模型和RNG k-ε湍流模型实现不同搅拌速度和桨叶离槽底高度下搅拌器性能的CFD模拟,对不同工况下搅拌器的搅拌效果进行分析讨论,为混肥搅拌器的应用和优化设计提供一定参考依据。
With the key part of fertigation system,mixed fertilizer blender,as the research object,based on reverse engineering,the agitator blades are reconstituted and analyzed. The results indicate that more than 90% domain of the all working surfaces can achieve ±0.1 mm above precision. The agitator flow field and an unstructured tetrahedron grid are built through ICEM software. Applying the multiple reference frame,the Eulerian model and the RNG k-ε turbulence model,the CFD simulation of the agitator performance under different speeds and distances from the bottom is conducted,and then the mixing effects are discussed. The established model and the simulation results can help the application,design and optimization of the fertilizer mixing agitator.
With the key part of fertigation system,mixed fertilizer blender,as the research object,based on reverse engineering,the agitator blades are reconstituted and analyzed. The results indicate that more than 90% domain of the all working surfaces can achieve ±0.1 mm above precision. The agitator flow field and an unstructured tetrahedron grid are built through ICEM software. Applying the multiple reference frame,the Eulerian model and the RNG k-ε turbulence model,the CFD simulation of the agitator performance under different speeds and distances from the bottom is conducted,and then the mixing effects are discussed. The established model and the simulation results can help the application,design and optimization of the fertilizer mixing agitator.
引文
[1]杨晓雪,闫学文.Geomagic Design X三维建模案例教程[M].北京:机械工业出版社,2016.
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[12]钟天铖,汤文成,刘碧茜.推进式搅拌器固液混合的计算流体力学模拟[J].东南大学学报(自然科学版),2016,46(4):713-719.
[13]袁祖强,景荣荣,倪受东.基于Fluent的陶瓷浆料搅拌槽的结构优化[J].机械设计及制造,2009,(3):23-25.
[2]刘丽晶,杨慧.基于Geomagic Design软件的导种管三维逆向工程设计[J].农业工程学报,2015,31(11):40-45.
[3]徐顺,汤方平,汤超,等.潜水搅拌器选型影响因子及其优化研究[J].中国给水排水,2016,32(23):76-79.
[4]陈建龙,李诚,张安琪,等.基于逆向工程的D型打结器重构与运动仿真[J].农业机械学报,2014,45(12):104-125.
[5]孔艳艳.基于Geomagic Design X的轴流式风机叶片逆向建模[J].黑龙江工业学院学报,2017,17(7):44-47.
[6]宋学官,蔡林,张华.ANSYS流固耦合分析与工程实例[M].北京,中国水利水电出版社,2012.
[7]刘宝庆,钱路燕,陈明强,等.新型大双叶片搅拌器功率与混合特性的数值模拟[J].化工学报,2013,64(3):849-857.
[8]张家华.基于离散元法的变量施肥机排肥器排肥过程仿真分析[D].新疆石河子:石河子大学,2015.
[9]钟丽,黄雄斌,贾志刚.固-液搅拌槽内颗粒离底悬浮临界转速的CFD模拟[J].北京化工大学学报,2003,30(6):18-22.
[10]杨锋苓,周慎杰,张翠勋,等.偏心搅拌槽固液悬浮特性[J].过控工程学报,2008,8(6):1 064-1 069.
[11]王福军.计算流体动力学分析-CFD软件原理和应用[M].北京:清华大学出版社,2004.
[12]钟天铖,汤文成,刘碧茜.推进式搅拌器固液混合的计算流体力学模拟[J].东南大学学报(自然科学版),2016,46(4):713-719.
[13]袁祖强,景荣荣,倪受东.基于Fluent的陶瓷浆料搅拌槽的结构优化[J].机械设计及制造,2009,(3):23-25.