摘要
以管壳式相变储热系统为研究对象,以强化储热系统的换热能力为目的,基于拓扑优化原理,建立了二维相变储热系统模型,对储热系统模型的传热能力进行了研究,讨论了不同的肋片设计对于传热能力的影响.研究结果表明:通过与传统肋片模型传热能力对比,验证了拓扑优化的优越性和可靠性;揭示了自然对流对于肋片优化和系统换热能力的影响规律;通过对肋片进行了几何重构并对重构模型进行数值模拟验证,证明了重构模型的准确性和可靠性,为实验验证打下基础.
Latent heat storage is widely investigated by the researchers due to its high volumetric energy density which makes it possible to largely reduce the energy storage cost. However, the phase change materials are known to suffer from poor thermal conductivity which greatly limits its use in the industry. A large amount of work has been carried out to enhance the heat transfer capability of the latent heat storage system. From a structural perspective, embedding of fin structure into the heat storage tank is considered as an effective way to lead to the overall heat transfer enhancement. For the moment, shape optimization and sizing optimization are the two most common optimization methods that are used to find the efficient finned structure in a heat storage tank. However, by predefining the shape of the geometry, the shape optimization and sizing optimization have more constraints when performing the optimization which limits the possibilities of a design change. Different from these two optimization approaches mentioned above, the topology optimization requires only few constraints when performing the optimization which enables dramatic design change without predefining the shape of the geometry. The core problem solved by the topology optimization is about the distribution of the materials and their topological connection within the design field. By topology optimization, high thermal conductive materials can be distributed in the heat storage tank in a way which maximizes the overall heat transfer capability of the heat storage system.The topology optimization of a classic tube-and-shell latent heat storage tank is studied in this paper to enhance the overall heat transfer capability. By combining the topology optimization theory and the classic finite element method, a 2-D heat storage tank model has been built for the optimization of the fin structure. Besides, a comparison between the topology optimized fin structure and other typical types of fin structures is carried out. The numerical simulation is also performed considering the effect of natural convection to see its impact on the design change of final result. Furthermore, the current research on topology optimization focuses mainly on the design phase. Few studies have been done to validate numerically the reliability of the reconstructed topology optimized design which is necessary before an experimental validation. Hence,in this paper, a numerical reconstruction of the fin structures is carried out and the validation of the result is performed.Several results could be drawn from the current research: The topology optimization shows its advantage over common fin structure design;The influence of natural convection on optimization has been investigated and analyzed;The result has been reconstructed in common CAD form and corresponding validation has been performed which serves for the preparation of the upcoming experimental investigation.
作者
游吟
赵耀
赵长颖
刘红兵
Yin You;Yao Zhao;Changying Zhao;Hongbing Lii(SJTU-Paris Tech Elite Institute of Technology,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of Engineering Thermophysics,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《科学通报》
EI
CAS
CSCD
北大核心
2019年第11期1191-1199,共9页
Chinese Science Bulletin
基金
国家重点基础研究发展计划(2013CB228303)资助
关键词
相变储热
拓扑优化
强化传热
自然对流
数值模拟
latent heat storage
topology optimization
heat transfer enhancement
natural convection
numerical simulation
