文档介绍：青岛科技大学
本科毕业设计(论文)
填充泡沫金属的相变蓄热单元管的数值模拟
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热能与动力工程
机电工程
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填充泡沫金属的相变蓄热单元管的数值模拟
摘要
吸热蓄热器是空间站太阳能热动力发电系统(Space Solar Dynamic Power System——SSDPS)的关键部件,其采用的蓄热方式是高温相变蓄热。高温相变蓄热大都选用氟盐作为相变材料,由于固液密度不同,PCM在相变过程中会产生空穴,这严重影响了蓄热容器的传热性能及结构可靠性。为改善氟盐PCM带来的不良影响,本文采用在PCM中填充泡沫金属的措施,泡沫金属以其高导热、质轻、高比热等特点作为填充物,成为强化相变蓄热的有效手段。
本文以太阳能热动力发电系统地面模拟试验中采用的吸热蓄热器内部的相变蓄热单元管为研究对象,-,钴基合金Haynesl88作为PCM容器及工质导管材料,并采用孔隙率为95%的多孔泡沫镍来研究单元管内部的强化传热情况。
关键词:相变蓄热单元管;FLUENT软件; 泡沫金属:强化传热; 数值模拟
Metal foam filling phase change thermal storage unit tube simulation
ABSTRACT
Heat Receiver is the ponent of the space solar dynamic power systems(Space Solar Dynamic Power System-SSDPS),it adopts the method of high temperature phase change thermal storage,in which the molten salt is usually selected as , solid density of PCM is different from its liquid density, which will cause cavity in the phase change cavity will seriously affect the heat transfer performance and structure reliability of heat storage ,PCM is encapsulated in many containers and metal foam is embedded in PCM to reduce the adverse effects of foam,with its high thermal conductivity, light weight,high heat capacity and etc,is selected as a filling with PCM,and is ing an effective way of strengthening the heat storage.
The paper takes the phase change thermal storage unit tube used in Solar Dynamic Power System ground test as the research molten salt LiF—CaF2 is selected as thermal storage material in heat exchange tube,Co-based alloys Haynes 188 is selected as material of PCM container and working fluid tube,and the porous nickel foam of 95% porosity is selected to str