高温空气在蜂窝陶瓷体内蓄热特性研究  

Investigated of Heat Transfer of High Temperature Air in Honeycomb Regenerator

作　　者：王艳[1] 白凤武[1] 王志峰[1] 

机构地区：[1]中国科学院太阳能热利用及光伏系统重点实验室,中国科学院电工研究所,北京100190

出　　处：《工程热物理学报》2011年第9期1541-1544,共4页Journal of Engineering Thermophysics

基　　金：2010年度中国科学院王宽诚博士后工作奖励基金

摘　　要：采用数值模拟方法对不同孔隙率和孔壁厚的蜂窝陶瓷体的蓄热特性进行研究。对高温空气在不同结构的蜂窝陶瓷体内流动过程中的压降、温度及蜂窝陶瓷体的蓄热特性进行了分析。研究结果表明:流体在蜂窝陶瓷内流动时,处于层流阶段的压降仅为湍流情况下的1/10。蜂窝陶瓷蓄热体的蓄热时间与蓄热体的孔壁厚成正比。蓄热体孔壁厚h=2mm时,出口空气温度达到800K所需的时间仅为2h。停止对蜂窝陶瓷进行热量输入时,蜂窝陶瓷体能进行自身的热平衡,在一定的时间内,使蓄热体内部的温度场趋于平衡。A numerical simulation of heat transfer in a honeycomb regenerator is carried out. Six types of honeycomb regenerators with different porosity and holes pitch were investigated. High temperature air with 1273 K flowed through honeycomb regenerator. The pressure drop, temperature distribution and heat transfer of high temperature air and honeycomb regenerator have been gained.The results showed that high temperature air flowed through honeycomb regenerator, the pressure drop in laminar flow was only i/i0 which in turbulent flow. The thermal storage time of the regenerator is longer with the holes pitch increased. When the holes pitch was 2 mm, the time which the outlet temperature reached 800 K was 2 hours. But when the holes pitch was 8 mm, the time which the outlet temperature reached 800 K was 8 hours. If there was no heat input, honeycomb regenerator could reach heat balance within a few hours and the temperature distribution trended to be balanced.

关 键 词：蜂窝陶瓷蓄热体 压力损失 蓄热温度 蓄热时间 

分 类 号：TK134[动力工程及工程热物理—热能工程]