Research Of The Scheme For Multi-functional Structures Based On Thermoelectric Technology

Design scheme of Multi- functional Structure(MFS) with thermoelectric conversion technology is studied in this thesis, and it can be applied in the structure design of Hypersonic vehicle in the future. Analyzing the structure of mechanics, heat transfer and thermoelectric conversion. Supplying power by using aero-thermo on the hot face sheet of MFS is one of important destination of this study. The MFS with thermoelectric conversion technology is an highly integrated structure concept with load-bearing, thermal- insulation and power-supplying.In this thesis, the general technical requirements of structure schemes are obtained and also key technologies of MFS are analyzed. The details of thesis contain providing and comparing three structure design schemes of MFS with thermoelectric generators. The main part of the thesis is the modeling and analyzing performances of Metallic Thermal Protection System(MTPS) with embedded semiconductor thermoelectric generators. The feasibility of this scheme is analyzed in the last.The mechanical models of load-bearing components and semiconductor thermoelectric generator are established. The commercial software ANSYS is used to analyze mechanical properties of honeycomb structure and load-bearing components and semiconductor thermoelectric generator respectively. The modal analysis of MFS is also implemented.The heat transfer model of MFS with thermoelectric conversion technology is established. The method of computing effective thermal conductivity coefficient of honeycomb-core is used in the analysis of heat transfer of MFS. The temperature distributions and time dependencies of temperature response of the MFS with and without thermoelectric generator are obtained.In the last part of thesis, the process of energy transfer and conversion of thermoelectric generator is analyzed firstly. The factors of influencing thermoelectric conversion efficiency and output power are studied subsequently. The system entropy is analyzed from the irreversible thermodynamics process. The effective thermal conductivity coefficient of the thermoelectric conversion generator is computed. The finite element model o f thermoelectric unit is established and its process is simulated. The power properties of the MFS with thermoelectric conversion technology is studied.