Research On Heat Transfer And Flow Characteristics Of The Baffle-guided Solar Chimney Power Plant System

As a zero-pollution clean energy power generation device,the solar chimney power plant system has gradually matured its theory and technology,but the large structure and low efficiency of the device have always been the main reasons why it is difficult to commercialize.In the current research method,the optimization and improvement of the solar chimney power plant system is realized through simulation and experiment.The focus of the research is to improve the output power of the system by improving the structure of the device.The study found that by adding a baffle,the output power of the system can be effectively increased.However,the research lacks systematic comparative analysis and experimental research.The research content of this article is expected to make up for some of the shortcomings and promote the commercialization of solar chimney power plant system.The author designed and studied six different types of baffles,and classified the different types with a,b,c,d,e,and f.The influence of 3,4,6,8,and 12 b-type baffles on the heat transfer and flow characteristics of the system is studied.The theoretical basis model is established through thermodynamic analysis.With the Fluent simulation software,the physical model of the baffle-guided solar chimney power plant system is constructed and numerically analyzed.The simulation uses the sun tracking algorithm to simulate the radiation conditions.From the study of temperature field,velocity field,relative standard deviation of velocity,pressure field and output power,the effects of different types and numbers of baffles on the heat transfer and flow characteristics of the system are studied.Furthermore,the heat transfer and flow characteristics of the baffleguided solar chimney power plant system within a day are studied.The author has built an experimental platform for a small the baffle-guided solar chimney power plant system.Temperature measuring points and velocity measurement points were arranged in the experimental platform to measure the temperature and velocity distribution in the small system.The changing laws of the small experimental platform are summarized and used to verify the simulation results.The comparison between simulation and experiment are shown that in the research of different types of deflectors,the b-type baffle has the best effect on improving the output power of the system.When studying different numbers of b-type baffle,as the number of baffles increases,the output power of the system continues to increase.Compared with the case without a baffle,the uniformity of the flow field of the system with 12 b-type baffles is the best.The relative standard deviation of velocity is only0.058,and the uniformity is increased by 14.9%.The actual output power is 30.368 k W,an increase of 19.1%.The temperature and pressure changes are relatively low.The changes in the heat transfer and flow characteristics of the solar chimney power plant system with 12 b-type baffles during one day have been further investigated.It can be seen that when the solar radiation increases,the performance parameters of the system increase,and vice versa.Around noon,the performance parameters of the baffle-guided solar chimney power plant system can be increased to the maximum.