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Analysis and optimization of blown film cooling systems based on an integrative and calibrated process model

基于集成和校准过程模型的吹膜冷却系统分析和优化

基本信息

批准号：
183117220
负责人：
Professor Dr.-Ing. Johannes Karl Wortberg
金额：
--
依托单位：
Lehrstuhl für Konstruktion und Kunststoffmaschinen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/183117220?language=en
关键词：
Analysis optimization blown film cooling

项目摘要

The blown film extrusion as well as any other extrusion process is limited by its cooling capacity. Only an optimization of the cooling system can improve the production throughput. Motivation of this research project is the numerical analysis and optimization of blown film cooling systems using a process model. This model is able to simulate a realistic blown film behavior depending on the cooling situation for several different materials and process conditions. For example a counter flow cooling system was analyzed and benchmarked using this simulation model.The aim of the second project phase is the development of basic methods for the numerical optimization and benchmark of existing and novel cooling systems for the blown film process. A prediction model to identify a suitable cooling configuration and the developed process model are used for this simulation task. The challenge of such a new method to optimize cooling systems is a realistic computation of the tube formation zone at variable cooling condition induced by different cooling geometries. Furthermore, this approach has to be validated for conventional and novel cooling systems.To verify the optimization method and prediction capability of the process model an alternative cooling system has to be dimensioned using the developed simulation tools and tested on the laboratory blown film extrusion line. The important issue of the new cooling device is an improvement in performance of the heat transfer for different polymers and process conditions. Such an improvement can be achieved in guiding the blown film near to the cooling system and in reducing or locally destroying the laminar sublayer. By reducing the temperature of the cooling system itself, the heat transfer mechanism thermal radiation can be improve. Furthermore, the tubular film has to be calibrated and guided during the cooling process.

吹膜挤出和其他挤出工艺一样，受到冷却能力的限制。只有优化冷却系统才能提高产量。本课题的研究动机是利用过程模型对吹膜冷却系统进行数值分析和优化。该模型能够根据几种不同材料和工艺条件的冷却情况模拟真实的吹膜行为。以某逆流冷却系统为例，利用该仿真模型进行了分析和基准测试。第二个项目阶段的目标是开发用于吹膜工艺的现有和新型冷却系统的数值优化和基准的基本方法。用于确定合适冷却配置的预测模型和开发的过程模型用于此仿真任务。这种优化冷却系统的新方法所面临的挑战是如何对不同冷却几何形状引起的变冷却条件下的管柱形成区域进行实际计算。此外，这种方法必须在传统和新型冷却系统中进行验证。为了验证过程模型的优化方法和预测能力，必须使用开发的仿真工具对备选冷却系统进行尺寸标注，并在实验室吹膜挤出生产线上进行测试。新型冷却装置的重要问题是提高了不同聚合物和工艺条件下的传热性能。这样的改进可以通过引导吹膜靠近冷却系统和减少或局部破坏层流子层来实现。通过降低冷却系统本身的温度，可以改善热辐射的传热机制。此外，在冷却过程中必须对管状膜进行校准和引导。