Study On Excitation Mechanism Of Dish Solar Thermal Power Systems Considering Fluid-structure Interaction And Their Optimization

As we all know, solar energy is the most abundant renewable clean energy in theearth. The development of solar energy as an alternative energy has broad prospects.Compared with fossil fuels, solar thermal power is a way to reduce the emission ofcarbon dioxide and the consumption of coal resources. In operation of the dish solarthermal power system, the wind-induced vibration makes the dish solar thermal powersystem under greatly uncertain aerodynamic loads, and some damage acts on thethermal power generation system or even destroys the entire solar thermal powersystems, resulting in a large number of casualties and economic losses.In order to do Analysis on wind-induced vibration mechanism of the dish solarthermal power generation system under constant wind, the dynamics simulation ofdish solar thermal power system is carried out in the paper and the multidisciplinarydesign optimization of condenser is studied to improve architecture of the dish solarthermal power generation system from wind damage and to provide a theoretical basisfor architecture design of the dish solar thermal power generation system in theproject practice. The main innovation and research work of the thesis are as follows:(1) Based on fluid-solid coupling theory, flow field analysis of the condenser inthe open flow field area is done. The total pressure distribution of the dish solarconcentrator reflective surface in a different posture with changing wind speed isobtained and distribution of vortex flow field near surface of the condenser is obtained.(2) Based on modal analysis theory, modal analysis of the dish solar thermalpower generation system is done. Five natural frequencies and mode shapes of thesystem are extracted. The movement of the change of natural frequency and maximumdeformation of the dish solar thermal power system considering and not consideringthe impact of fluid-structure interaction is revealed.(3) The multidisciplinary design optimization model is established with theobjective function of the quality and flow field performance of dish solar concentrator.Adaptive chaos optimization algorithm is adapted to solve weights factor ofmulti-disciplinary design optimization. The results show that the flow fieldperformance of the dish solar concentrator after optimization is greatly improved.