太阳能热气流发电系统非稳态数值模拟  

NUMERICAL SIMULATION OF UNSTABLE STATE IN POWER GENERATION SYSTEM WITH HOT AIR FLOW PROVIDED FROM SOLAR ENERGY

作　　者：明廷臻[1] 刘伟[1] 熊宴斌[1] 管绪虎[1] 许国良[1] 潘垣[1] 

机构地区：[1]华中科技大学,湖北武汉430074

出　　处：《热力发电》2008年第1期17-20,共4页Thermal Power Generation

基　　金：教育部重点基金资助项目(104127)

摘　　要：对太阳能热气流发电系统及蓄热层中的传热与流动特性进行了数值模拟。建立了集热棚、烟囱以及蓄热层内部的传热流动数学模型,分析了太阳辐射对蓄热层蓄热性能的影响。计算结果表明:土壤具有热惯性和较强的蓄热作用;蓄热层表面平均温度和烟囱出口平均温度随时间有一个较大的波动,且蓄热层表面平均温度的波动幅度更显著;蓄热介质的平均温度及系统散热量随时间波动,采用双层玻璃或薄膜材料可减小集热棚顶棚能量损失。The numerical simulation of heat transfer and flow characters in power generation system with hot air flow provided from solar energy and in the heat - accumulating layer has been carried out. The mathematical model of heat transfer and flow in heat - col- lecting shed, chimney, and inside the heat- accumulating layer has been established, the influence of solar radiation upon the heat- accumulating performance of said layer being analysed. Result of calculation shows that the soil has thermal inertia and stronger heat - accumulating effect; there is a large fluctuation of average temperature at the surface of heat -accumulating layer and at the outlet of chimney along with the elapse of time; and the fluctuation of average temperature at surface of the heat - accumulating layer is more remarkable; the average temperature of heat- accumulating medium and the heat -dissipating amount of said system are also fluctuating along with the elapse of time. The energy loss from ceiling of the heat - collecting shed can be decreased by using double - layer glass or membrane materials.

关 键 词：太阳能 热气流发电系统 集热棚 蓄热层 烟囱 传热 非稳态数值模拟 

分 类 号：TM615[电气工程—电力系统及自动化]