Study On The Transmission Characteristics Of The Solar Of CPC Cluster Two-stage Concentrator

Arranging a reflective secondary concentrator on the focal plane of the solar primary concentrator to form a solar two-stage concentrator system is an important method to improve the solar high-temperature heat conversion efficiency and optimize the heat transfer performance in the heat absorption cavity.On the other hand,the common reflective secondary concentrator 3D CPC(Compound Parabolic Concentrator,3D compound parabolic concentrator),the curved surface is complex,it is difficult to achieve the precision of curved mirror reflection technology.Pasting trapezoidal flat mirrors on a relatively rough 3D CPC shell to form a curved array to form an array-type 3D CPC is an effective way to approximate the reflective and concentrating effect of the 3D CPC.To this end,this dissertation uses a combination of numerical simulation and experimental measurements to determine the single-stage and two-level sunlight transmission characteristics research and analysis.First of all,using Pro E and Trace Pro software together,combined with 3D printing technology,design the receiving half angle to be 45 and 50 degrees respectively,the number of divided blocks in the circumferential direction ? the number of divided blocks in the height direction are 6 ? 4,6 ? 5,6 ? 6 And 6 ? 1(hexagonal platform)8 kinds of CPC models with opening diameter of 150 mm array type.Based on the combination of CCD camera and Lambertian board,combined with image processing technology,the focal plane heat flux distribution of the single-stage array 3D CPC model was experimentally measured.The simulation and experimental data were compared to verify the feasibility and simulation of the array3 D CPC Method reliability.Secondly,using Proe,Trace Pro,Tecplot,Fortran and self-programming software,considering the optical error and other factors,the solar energy transmission characteristics of the array 3D CPC and two-stage parabolic concentrator were simulated and analyzed to obtain the bottom and side wall surface of the cylindricalconcentrator the distribution law of aggregated energy flow density.On this basis,a3 D CPC cluster array solar two-stage concentrator transmission model consisting of multiple hexagonal 3D CPCs was established,and the solar transmission characteristics and influencing factors of the two-stage concentrator were simulated and analyzed,and it is verified and compared with the experimental results.Through the research in this dissertation,the single-stage CPC and 3D CPC cluster single-stage and two-stage sunlight gathering and transmission laws are clarified,which provides technical support for the development of reflective secondary collector technology.