Study Of Micro Thermophotovoltaic Power System With Flat Combustor

In recent years, Micro–ElectroMechanical System (MEMS) has been widely applied. But the energy source has turned out to be the greatest hindrance to its development. Therefore it has strong practical significance to develop micro–drive systems with high power and density. As one of them, micro thermophotovoltaic system has gradually become one of the research hotspots because of its advantage.Goal in research of this paper is micro thermophotovoltaic systems using the flat micro-combustion (radiation) device. Combustor is the core component and energy source of the system, its internal combustion and heat transfer process directly affect the system's energy conversion efficiency. Numerical simulation and experimental are used to do the research, with the purpose of observing the factors affecting its working process and seeking effective means to optimize its performance.Simulation can help to make qualitative analysis of the working process of the combustor. We have established the combustion and heat transfer computational model of the combustor to simulate the influence of different porosity, inlet, flow volume mixing ratio and other conditions which affect the combustor wall temperature and internal distribution of flow and concentration fields. The result shows that: a reasonable structure and working parameters can improve its working performance; Under the same conditions, the existence of porous medium can keep higher and uniform wall temperature and lower exit temperature, which will greatly help improve the whole system conversion efficiency. Experiment can be used to verify the correctness of calculation. In the same time, referring to the predicted results of the calculation help to make more effective quantitative research. The main subject of this paper is the flat combustor, the cylindrical combustor is researched as a comparative experiment. Wall and exit temperature distribution can reflect its internal combustion and heat transfer process. By observing the influence of structure parameters and working conditions on the micro-combustor temperature distribution, we can get the law of correlative factors affecting its working performance. Heat Radiation is measured by PV wafer. The results show that: changes in the shape of the combustor has some influence on its working performance. Selecting appropriate parameters of the structure, working conditions and wall materials with strong selective radiation characteristics of which radiation spectrum matching to the absorption spectrum of the low energy gap battery can optimize the combustor temperature distribution, thus improve its working performance and the conversion efficiency of the whole system.