Researches On The Wind Environment Simulation On Large-scale Heliostat Field

The problem of energy shortage and environmental pollution in the world today is aggravating.Since 1970 s,as a renewable energy solar energy has been paid attention gradually and has entered a booming age.Among the various ways of utilizing solar energy,tower solar thermal power generation has its obvious advantages.The heliostat group is the main equipment of the tower solar thermal power station and the main investment part of the power station,the heliostat group costs about half of the total cost of the entire plant.It is always difficult to design the wind resistance problem of heliostat from the tower solar power station.Genearlly the structural design of heliostat need to satisfy normal work under certain wind speed,it will not destroy under the strong wind,so it is necessary to study the wind environmental of large-scale heliostat.But in countries that start later on solar energy technology,how to solve the safety of heliostat under the fresh gale is a very important issue.This dissertation develops investigation on heliostat of the wind field speed distribution,the wind field pressure distribution and heliostat,s surface wind pressure distribution through technologies of theoretical analysis and numerical simulation.The main research include:⑴This paper mainly introduced the development of tower solar thermal power generation at home and abroad,the heliostat structural,the research methods of the wind engineering,the related theories and methods of numerical simulation.Focus on the numerical simulation of turbulent flow field,supercomputers,the research results and current situation of numerical simulation of wind engineering research are introduced.⑵The CFD model of single heliostat and a number of heliostat under five typical operation situations were founded with technology of numerical simulation used.The corresponding UDF program was framed and used to simulate the wind field entry conditions coincident with the field measurement.The Realizablek-?model was selected to compute,and the obtained simulated a single heliostat and a number of heliostat of the wind field speed distribution,the wind field pressure distribution,it provides a certain basis for the research of large-scale heliostat.⑶The numeriacl simulation used the supercomputing technology of software Fluent that it based on the national supercomputing center,established a numeriaclsimulation model of heliostat group,according to the actual situation of the group seted up the heliostat boundary layer to the extrance,exit and wall conditions,choosed the Realizablek-?model that it simulates the heliostat group in elevation work at 30 degrees and different elevations.The wind environment of the large-scale heliostat and the distribution of the mean wind pressure distribution on the mirror surface were calculated by numerical simulation.⑷ The numerical simulation results are compared with the relevant theories of construction structure load regulation in China.The reliability of numerical simulation results is verified.The results are compared with the numerical simulation results of single heliostat and a number of heliostat.The wind environment and the average pressure distribution of the large-scale heliostat were obtained.