| Space solar power station(SSPS)is a huge space energy system with large-scale,high mass,multi-system,and multi-disciplines involving optics,structure,thermal,electricity,etc.Given the structural characteristics of SSPS-OMEGA and its great challenges to thermal design and thermal control,this thesis is mainly concerned with the in-orbit thermal analysis of the SSPS-OMEGA,thermal control strategy and method of gyro photovoltaic(PV)array,heat dissipation design of ground demonstration and verification system,concept design of SSPS.The author’s major contribution to these subjects can be summarized as follows:1.The in-orbit thermal analysis of SSPS-OMEGA was performed.Firstly,based on the structural characteristics and light gathering characteristics of OMEGA concept,thermal load analysis of gyro PV array is carried out,which lays a foundation for in-depth in-orbit thermal analysis and design.Secondly,the thermal analysis model of OMEGA is established to analyze the heat dissipation characteristics under the space environment.Furthermore,the influence of temperature on the photoelectric conversion efficiency of gyro PV array is discussed,which builds a foundation for the following further work.2.The design method of passively full-spectrum selective thermal control thin film is proposed.Firstly,based on classical electromagnetic theory,the energy transfer matrix and wave equation in the multilayer system are derived,and then an optimal design model is established which takes the selective utilization of sunlight as the objective function and the parameters of the multilayer system as variables.Secondly,the Opto-thermo-electrical mathematic relationship of Ga As solar cells is derived.Furthermore,the evaluation criteria of thermal control performance for thermal control film is presented and applied to sandwich structures.Numerical experiments exhibit the rationality and validity of this method.3.The theory and method of heat dissipation design combining bionics and topology optimization are proposed.Firstly,an optimization design model is established to minimize the average surface temperature and flow channel pressure loss,and the optimal inlet and outlet location and the optimal flow channel topology distribution of the photovoltaic backplane can be obtained,so that the heat in the photoelectric conversion system can be efficiently exported.Secondly,the topology optimization of space heat radiation dissipation based on bionics(butterfly wing shape and its vein layout)is proposed,which can ensure the optimal shape and flow channel layout design of the radiator in the sense of efficient space heat dissipation with constraints.Numerical examples verify the correctness and effectiveness of the proposed model and method.4.The heat dissipation design and test of SSPS-OMEGA ground demonstration and verification system are carried out.Firstly,a thermal management strategy for the parallel fluid loop of a pump drive is proposed to reduce the pressure loss and pump work requirement.Secondly,the blown thermal-structural integrated thin cold plate is developed as the heat dissipation and support structure of the PV backplane unit.Furthermore,thermal tests and numerical simulations based on the model are carried out.Experimental and simulation results verify the correctness and effectiveness of the design method.5.An concept of SSPS based on secondary reflection is proposed.Firstly,based on the spherical concentrator,a secondary concentrator is introduced to simplify the complex gyro PV array into a disc plane.At the same time,the transmitting antenna is placed on the outer north and south poles of the spherical concentrator to solve the problem of its shielding and the special requirements of microwave transparency of concentrator film.Secondly,the optimization design method of the secondary concentrator is introduced in detail.The feasibility of this proposed concept is proved by numerical results. |
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