The Structure Analysis And Numerical Simulation Of Wind Load On Dish Solar Concentrator

Dish solar concentrator is a rotatable dish-shaped plate and non-streamlined structure, it has large spatial size and frontal area, the sensitivity of the wind effect is very strong. Dish solar concentrator structure is diverse, but there are obvious deficiencies, such as condenser structural rigidity and wind loa d strength are insufficient. Dish solar concentrator generally work in the open air, wind load may cause condenser deformation or abnormal vibration. If the excitation frequency close to its natural frequency, condenser will produce resonance, resulting in structural damage. Condenser structure has the potential to produce deformed when the wind load is too large, serious wind damage can also lead to condenser mirror squeeze broken. In order to avoid condenser produce resonance with the outside excitation, and to avoid damage to the wind effects on the condenser, this paper will analyze the vibration characteristics and wind load of condenser.Firstly, this paper using 25 KW dish solar thermal power system condenser as the model, based on the known parameters, using ANSYS software to establish three-dimensional of condenser structure. And then it discussed in detail unit type selection, the principle of grid division as well as model reasonable simplified of condenser. ANSYS established a dish solar concentrat or finite element model for finite element analysis calculation.Secondly, this thesis analyzed the vibration characteristics of dish solar concentrator. To avoid the resonance between dish solar concentrator and wind load, we need to study the vibration characteristics and increase the stiffness of the condenser structure by structural improvements. This paper conducted modal analysis for dish solar concentrator and got first ten natural frequencies and mode shapes of condenser. According to the results of modal analysis, this paper provides optimization proposal for concentrator on the basis of vibration characteristics and dangerous areas of concentrator, and conducts model analysis for improved structure, improved rigidity and vibration characteristics o f condenser, to ensure that the condenser does not resonate with the wind load.Furthermore, studying dish solar concentrator flow field characteristics and wind pressure distribution under wind effects. Based on the dish solar concentrator, this paper used Gambit software to build condenser computational domain model and used continuous and momentum equations for fluid flow theory analysis. Moreover, this paper conducted numerical simulation calculate for dish solar concentrator computational domain by Fluent software, analyze the concentrator flow field characteristics and wind pressure distributions under different altitude and azimuth angle. The simulation results not only as the basis for one-way flow solid coupling strength analysis, and provide a reli able theoretical basis for the wind-resistant design of dish solar concentrator.Finally, This thesis conducted wind load static analysis for dish solar concentrator, combined improved dish solar concentrator with the wind pressure analysis results of various altitude and azimuth angle. This paper imported directly the condenser wind pressure results into ANSYS, then conducted static strength analysis for condenser, and got condenser displacement deformation and stress distribution of different working conditions under wind loads, to determine the most dangerous area and the best sheltered position.This paper conducted modal analysis, flow field analysis and one-way flow solid coupling static analysis of dish solar concentrator by ANSYS and Fluent software. Fully understanding the vibration characteristics, flow field characteristics and wind-resistant strength characteristics, preventing condenser resonance, determining the optimal and the worst wind sheltered conditions, to be sure the dangerous areas and weak points of condenser under wind load, understanding condenser displacement deformation and stress distribution. The results not only to provide a reference for the dish solar concentrator wind-resistant design, but also provides an important theoretical basis for dish solar concentrator optimization.