Particle Simulation for the Conveying Behavior of Granules in Grooved Bushing Extruders

沟槽衬套挤出机中颗粒输送行为的颗粒模拟

基本信息

批准号：
389880750
负责人：
Professor Dr.-Ing. Volker Schöppner
金额：
--
依托单位：
Fachgebiet Kunststoffverarbeitung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/389880750?language=en
关键词：
Particle Simulation Conveying Behavior Granules

项目摘要

The goal of the proposed research project is to reformulate the mathematical description of the conveying behavior in grooved bushing zones based on numerical simulations. This enables the possibility to detect the complex movements of the granules in the feed section in a 3D environment and thus improves the calculation accuracy. In previous research projects, it was shown that both, the conveying mechanisms and the energetic process behavior in the solids conveying area, can be well represented using the Discrete Element Method. Therefore, this method provides the basis for this application. In the simulations, process and material parameters are varied with the aid of a centrally composed design as well as geometrical parameters in the screw channel and grooves. Also axially or spiral machined grooves are taken into account by varying the groove angle. Next to verification studies supported by numerical simulations, a detection of physical boundaries will be performed. Thus, in the case of simulations with a smooth bushing zone, it can be seen that, despite a particle backlog, caused by the backpressure, the first screw flights can be partially filled. This leads to a displaced pressure profile, so that the pressure does not increase anymore over the entire feed section. Analogies are expected at sufficiently high rotational speeds on grooved systems. This also requires a new formulation of existing calculation models. The results obtained, will finally be systematically validated. Here, a test stand has been developed which will be adjusted to the desired grooved bushing system. With an existing validation, an extensive description of the conveying processes in grooved bushing zones is possible.

拟议的研究项目的目的是根据数值模拟重新重新重新对套管衬套区域中传送行为的数学描述。这使得有可能在3D环境中检测进料部分中颗粒的复杂运动，从而提高计算精度。在以前的研究项目中，可以使用离散元素方法很好地表示，固体输送区域中的输送机制和能量过程行为都可以很好地表示。因此，此方法为此应用提供了基础。在模拟中，借助螺丝通道和凹槽中的中央设计以及几何参数，过程和材料参数的变化。同样，通过改变凹槽角度来考虑轴向或螺旋加工的凹槽。在数值模拟支持的验证研究之后，将进行物理边界的检测。因此，在具有光滑衬套区域的模拟的情况下，可以看出，尽管粒子积压是由背压引起的，但第一个螺丝飞行可以部分填充。这导致压力剖面的位移，因此在整个进料区域的压力不再增加。预计在槽系统上的旋转速度足够高的情况下，类比。这也需要对现有计算模型的新公式。获得的结果将最终被系统地验证。在这里，已经开发了一个测试架，该测试架将调整为所需的凹槽衬套系统。有了现有的验证，可以广泛描述槽衬套区域中的传送过程。