依托高楼的太阳能热气流电站系统的CFD模拟  

CFD (Computational Fluid Dynamics) Simulation of a Solar Energy Hot Airstream Power Plant System Installed in a High Building

作　　者：周艳[1] 李洁浩[1] 李庆领[1] 

机构地区：[1]青岛科技大学机电工程学院,山东青岛266042

出　　处：《热能动力工程》2010年第2期226-229,共4页Journal of Engineering for Thermal Energy and Power

基　　金：山东省自然基金资助项目(Z2008F05);山东省教育厅基金资助项目(J08LA13)

摘　　要：设计了一种依托高楼的太阳能热气流电站,建立了相应的数学模型。利用Fluent软件对该系统的流场及温度场进行了数值模拟,并对电站结构进行了优化设计。模拟结果表明:随着烟囱高度的增加,烟囱内气流的温度不断上升,在出口处由于回流的影响温度稍有下降,气流速度不断增大,气流的压力分布先减小后增加。由于平板集热器的加热作用使烟囱内气流的温度分布不均匀,设计中可将平板型储热器换为带有肋片扩展表面的储热器,并对烟囱与扩压管联接处采用流线形联接进行过渡,以减少此处的流动阻力。同时,设计一个收缩型的烟囱出口,以保证电站系统产生较大的抽力,从而提高电站系统的能量转换率。Designed was a solar-energy hot airstream power plant installed in a high-rise with a corresponding mathematical model being established. By using software Fluent, a numerical simulation was performed of the flow and temperature fields in the power plant system under discussion. Moreover, the power plant configuration also underwent an optimized design. The simulation results indicate that with an increase of the smoke stack height, the airstream temperature in the smoke stack will ceaselessly rise and drop slightly at the outlet as influenced by the return flow. With the airstream velocity ever increasing, the airstream pressure distribution will first decrease and then increase. In the meantime, as the airstream is being heated by a plate-type heat collector, the airstream temperature distribution in the smoke stack is not homogeneous. The plate type heat accumulator can be designed as one with finned extended surface to form a heat-storage unit. The connection between the smoke stack and the pressure diffusion tube can be streamlined to form a transition, thus reducing the drag force at the above location. At the same time, a convergent smoke stack outlet can be designed to secure a relatively big suction head for the power plant system, thereby enhancing the energy conversion rate of the system in question.

关 键 词：太阳能热气流电站 流场 CFD 烟囱高度 优化设计 

分 类 号：TM615[电气工程—电力系统及自动化] O354[理学—流体力学]