Research On The Dust Removal Mechanism Of Applying High Frequency Airflow On The Photovoltaic Module And The Design Of Nozzle With Multi-stage Expansion Cavity

In the face of increasingly intense energy,solar photovoltaic power generation has been popularized by all countries in the world.With the rapid development of photovoltaic power generation,more attention should be paid to the quality of development.How to improve the power generation efficiency of photovoltaic power plants is an important issue worth exploring and researching,and one of the key factors to improve the performance of photovoltaic power generation is to solve the dust accumulation problem of surface adhesion.In view of the problems such as low dust removal efficiency and damage to the surface of photovoltaic panel of the existing dust removal device,a systematic and in-depth study on the surface dust removal mechanism and device design of photovoltaic panel based on high frequency airflow was proposed in this thesis,so as to achieve the best effect of removing adhesion particles without damaging the surface of photovoltaic panels.The main contents and conclusions of the thesis were as follows:1.Based on the theory and model of classical solid surface adsorption mechanics,a mechanical model of particle adsorption on photovoltaic panels under dry and humid environment was established.By analyzing the dust deposition environment of typical photovoltaic panels,the physical characteristic parameters and their distributions of particles and photovoltaic panels were determined,and the parameters and their distribution were introduced into the model.According to the motion of the particles when they leave the surface under turbulent flow,the calculation model of the detachment of the adhering particles under the turbulent flow was established.Finally,the Monte Carlo simulation method was used to calculate the critical flow shear velocity of the dust detached from the surface of the photovoltaic panel.2.Solidworks software was used to establish a three-dimensional model of multi-stage expansion nozzle.Several nozzle configurations were obtained by changing the number,position and direction of the air inlet.FLUENT software was used to simulate the flow field inside the nozzle,the internal flow field and outlet airflow velocity of different nozzle were obtained.The results showed that a vertical inlet is provided in the middle of the gas storage chamber,and the inlet and multi-stage expansion chambers were biased towards the gas storage chamber.The velocity distribution of each monitoring point was the most uniform.3.According to the situation of dust on the surface of photovoltaic panels,the discrete particle model of particle swarm was established by EDEM software.The flow field distribution near the particle group was obtained through the analysis of the flow field between the outlet of the multi-stage expansion nozzle and the surface of photovoltaic panel.The EDEM software and FLUENT software were used to simulate the removal of the dust on the surface of photovoltaic panels under high frequency airflow,which will provide the theoretical basis for the final design of dust removal device for photovoltaic panels based on high frequency airflow.4.According to the working conditions and parameters of the high frequency airflow nozzle,the dust removal device on the surface of the photovoltaic panel was designed,and the test system and platform for the surface of the photovoltaic panel were set up.By simulating the photovoltaic power generation environment and detecting the power generation performance parameters of the photovoltaic panels,the dust removal efficiency of the surface dust removal device based on the high-frequency airflow was determined,and the established model was verified to meet the dust removal requirements of the photovoltaic panel.