摘要
提出了全新的同向自洁双螺杆非对称造型新概念。给出了转速比为2∶1的2根螺杆的端面造型和运动关系并建立了数学模型。以符合Carreav定律的流体为加工对象,采用Polyflow软件的叠加网格技术,分别对新型非对称双螺杆和传统双螺杆端面内的周期性二维流动和混合进行数值模拟研究。采用粒子追踪技术,对混合过程进行了动力学行为表征,证实了新型非对称螺杆内混沌混合的存在。通过统计学分析,得出累积分散准数和拉伸长度,分析了新型非对称双螺杆和传统双螺杆的混合行为差异。
The new concept of the dissymmetry modeling for fully wiped co-rotating screws is proposed. The cross-section geometry and time periodicity of the novel co-rotating non-twin screws with the speed ratio being 2 are presented and the corresponding mathematical model is described. The fluid concerned obeys the Carreau flow model. Using the mesh superposition technique provided by the finite element package polyflow software, the two-dimensional periodical flows and mixing in the conventional twin screw groups and the novel co-rotating non-twin screw group are simulated respectively. Adopting particle tracking technique, the mixing dynamics performances are characterized, and the results confirm the fact that chaotic mixing occurs in such novel geometries. The segregation scale is analysed by statistical methods, and then the cumulative index and strechlength are obtained. The differences in mixing behavior between traditional twin screws and novel co-rotating non-twin screws are detailed.
出处
《现代塑料加工应用》
CAS
北大核心
2012年第4期53-56,共4页
Modern Plastics Processing and Applications
基金
广东省自然科学基金(10151030007000001)
关键词
新型非对称同向双螺杆
模拟
分离尺度
长度拉伸
混沌混合
novel co-rotating non-twin screws
simulation
segregation scale
lengthstretch
chaotic mixing
