基于幂法则的太阳能热风系统性能研究  

STUDY ON THE PERFORMANCE OF SOLAR CHIMNEY POWER IN POWER-LAW APPROACH

作　　者：闫云飞[1,2] 代长林[1,2] 张力[1,2] 

机构地区：[1]低品位能源利用技术及系统教育部重点实验室(重庆大学),重庆400030 [2]重庆大学动力工程学院,重庆400030

出　　处：《太阳能学报》2016年第1期157-163,共7页Acta Energiae Solaris Sinica

基　　金：重庆市自然科学基金重点项目(2009BA6067)

摘　　要：利用数值模拟方法研究温升、"抽力"与体积流量关系以及集热棚半径、涡轮压降对系统性能参数的影响规律,所得的温升-体积函数关系可为初始设计中系统及设备性能的分析、控制算法的设计提供帮助。结果表明,"抽力"与体积流量间函数以最佳流量为分界点呈不同关系:低于最佳流量时,"抽力"是流量的一次函数;大于最佳流量时,"抽力"是流量的幂函数,其指数m与最佳压降比f_(opt)存在关系f_(opt)=(2-m)/3,通过幂函数求得的系统最大功率、最佳涡轮压降比与实际值的误差均在3.5%内。随着集热棚半径的增大,幂函数指数、一次函数斜率、系统功率、空气温升、蓄热层温升等均表现出增大趋势,最佳压降比、集热棚净效率、单位面积功率及热流密度均呈减小趋势。随涡轮压降增大,空气温升速率增大、"抽力"增大速率逐渐增大,且涡轮压降增大与"抽力"增大的共同作用导致流量随涡轮压降增大而线性减小。The relationship between temperature rise and volume flow, pressure potential and volume flow and the influence of collector radius and turbine pressure drop on the performance of solar chimney are investigated using numerical simulations. The functional relation may be useful for the preliminary estimation of power plant, performance prediction, the device performance analysis and control algorithms designed in initial design phase. The results show that both sides of the optimum volume flow the relationship between pressure potential and volume flow are different. When less than optimal flow, pressure potential is a line function of volume flow; greater than optimal flow, pressure potential is a power function of volume flow. The relationship between exponential m and optimum turbine pressure drop ratio f,p, is fo,, --（2 - m）/3. The difference of maximum power and optimum turbine pressure drop ratio obtained by power function and actual value are within 3.5%. With the increasing of collector radius, the system power, air temperature raise, storage layer temperature raise showed an increasing trend while optimum pressure ratio, power per unit and heat flux are tested decreasing trend. With the increasing of turbine pressure drop, the increases rate of air temperature rise and pressure potential are increase, and led to volume flow decreases linearly.

关 键 词：幂法则 最佳压降比 集热棚半径 抽力 

分 类 号：TK01[动力工程及工程热物理]