太阳能热气流发电系统的传热与流动数值分析  

NUMERICAL ANALYSIS OF HEAT TRANSFER AND FLOW IN THE SOLAR CHIMNEY POWER GENERATION SYSTEM

作　　者：明廷臻[1] 刘伟[1] 熊宴斌[1] 管绪虎[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《太阳能学报》2008年第4期433-439,共7页Acta Energiae Solaris Sinica

基　　金：教育部重点研究基金(104127)

摘　　要：建立了集热棚、烟囱以及多孔蓄热层的太阳能热气流发电系统传热与流动数学模型,分析了太阳辐射对蓄热介质的蓄热特性的影响。计算结果表明,在太阳辐射为200～800W/m^2的范围内,随着太阳辐射的增强,蓄热介质的蓄热比例先减小后增大;烟囱底部的最小相对压力显著减小,流动速度增大;系统内空气的温升增大,蓄热介质表面的温度也显著升高。Mathematical models to describe the mechanism of heat transfer and flow in the collector, chimney and the energy storage medium of the solar chimney power generation system were established, and the effect of the solar insolation on the heat storage characteristic of the energy storage medium was analyzed. The numerical simulation results show that the heat storage radio of the energy storage medium decreases firstly and then increases alone with increase of the solar radiation from 200 W/m^2 and 800W/m^2 ;The minimum relative static pressure at the bottom of the chimney decreases significantly while the flow speed increases, the temperature difference between the system and the environment and the temperature of the surface of the enrgy storage medium increase notablely.

关 键 词：太阳能热气流发电系统 集热棚 蓄热层 烟囱 

分 类 号：TK515[动力工程及工程热物理—热能工程]