Abstract
With the rapid development of portable devices and micro-small sensors, the demand for small-scale power supplies and high-energy-density energy supply systems is increasing. Comparing with the current popular lithium batteries, micro-scale burners based on micro-thermal photoelectric systems have features of high power density and high energy density, the micro-scale burner is the most critical part of the micro-thermal photovoltaic system. In this paper, the combustor was designed as a heat cycle structure and filled with porous media to improve the combustion characteristics of the micro combustor. In addition, the influence of the porous media distribution on the burner center temperature and wall temperature distribution were studied through numerical simulation. Furthermore, the temperature distribution of the combustor was studied by changing the porous media parameters and the wall parameters. The research results show that the heat cycle structure can reduce heat loss and improve combustion efficiency. When the combustion chamber is filled with porous media, it makes the radial center temperature rise by about 50 K and the temperature distribution more uniform. When filling the heat cycle channel with porous media the wall temperature can be increased. Finally, the study also found that as methane is combusted in the combustor, the temperature of the outer wall gradually increases as the intake air velocity increases. The results of this study provide a theoretical and practical basis for the further design of high-efficiency combustion micro-scale burners in the future.
Highlights
With the rapid development of portable devices and micro-sized sensors, there is an increasing demand for small-scale power supplies and high-energy-density energy supply systems
Comparing with the current popular lithium battery products on the market, micro-scale burners based on hydrocarbon fuels have characteristics of high power density and high energy density [1,2,3,4,5,6]
The research results showed that when the micro burner was filled with porous media, its wall temperature compared with the non-porous medium, had an increase of about 100 K, and the filling of the porous medium extended the combustion limit of the micro combustor
Summary
With the rapid development of portable devices and micro-sized sensors, there is an increasing demand for small-scale power supplies and high-energy-density energy supply systems. Regenerative burners can make good use of waste heat to heat unburned gas, which saves energy, and improves combustion efficiency, which can effectively solve the problem of micro-scale burners. The research results showed that when the micro burner was filled with porous media, its wall temperature compared with the non-porous medium, had an increase of about 100 K, and the filling of the porous medium extended the combustion limit of the micro combustor. They studied the relationship between the intake air flow rate and the temperature of the outer wall of the micro-combustion chamber. The relationship between the regenerative porous media combustor at different intake air flow rates, equivalence ratio, the axial temperature of the combustor, and the temperature distribution of the outer wall surface were investigated for insight into the factors affecting the performance of the combustor to obtain the best performance of the combustor
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