Study On Wind Pressure Distribution Of Large-scale Heliostat Group Based On Supercomputing

As a kind of clean energy with abundant reserves and unlimited access,solar energy has become more and more mature in recent years.Among them,the tower solar thermal power station(CSP)has become an important way to utilize solar energy due to its high concentration ratio,high solar energy conversion rate,increased power generation efficiency,and higher cost optimization space.The tower solar thermal power station is composed of thousands of large-scale heliostat groups combined in a certain way,while the heliostat is a plane mirror used to track the sun,supported by metal structures.The related tracking control system adjusts the orientation and pitch angle of the mirror to project the reflected sunlight onto the collector,which is a very important device for the tower solar thermal power station.The tower solar thermal power station is generally built in a remote and open area.The strong wind has obvious damage to the heliostat.Under normal circumstances,heliostats should meet the requirements of 2 points: normal operation under the action of 6 winds,and no damage under the action of 8 winds.When working on heliostats,it must be ensured that the sunlight reflected by each heliostat can be accurately directed to the target collector tower.Under the action of strong winds,the mutual interference between the heliostats will affect the accuracy of the heliostats reflecting sunlight.The wind resistance problem of heliostats has always been a difficult problem in the actual design.Therefore,the research on wind environment after mutual interference of large-scale heliostat groups is very important for the development of heliostat wind-resistant and tower solar thermal power generation system(CSP).In this paper,numerical simulation of single heliostats and hundreds of large-scale heliostat clusters is carried out by theoretical analysis,wind tunnel test and numerical simulation techniques in structural wind engineering.The research results of wind pressure distribution,pulsation characteristics and statistical characteristics of large-scale mirror groups were obtained.The main content is:(1)Briefly introduce the development status of tower solar thermal power stations in recent years,the history and current status of heliostat research,the research methods and related development of structural wind engineering,the basic principles and methods of CFD numerical simulation technology,Supercomputer and CFD software architecture.(2)Based on the supercomputing technology of the national supercomputing center in changsha,large eddy simulation was used to calculate the single heliostat by using Fluent17.0 software.The selection principles and calculation methods of parameters related to the helioscope model,grid division,boundary conditions and so on were determined,and the distribution law of the wind pressure coefficient of the helioscope was obtained.Then,the relevant results of numerical simulation and wind tunnel test under the same working condition were compared to verify the reliability of the numerical simulation method.(3)Based on the principle of numerical simulation of single heliostats and related methods,a large-scale heliostat group model at different wind directions was established to simulate the operation of large-scale heliostat group at different wind directions.By analyzing the distribution law of the wind pressure and the related pulsation characteristics of the heliostat mirror in a special position in the mirror group,the working conditions of the heliostats at different positions of the large-scale heliostat group are obtained,which provides a basis for practical engineering applications.