Abstract
The increase of micro and nano devices has led to the miniaturization and multi-functionalization of micro-mechanical, communication, imaging, sensing, chemical analytical and biomedical devices. The devices so mentioned above need power sources that are portable, have short charging time, longevity, high energy density and are environmentally friendly. Chemical batteries hitherto used to be the major power source for these devices but have a drawback of having low energy density. The energy density of the most improved lithium-ion battery was in the region of 0.2 kWh/kg. Micro-combustor is one of the most important components of the micro thermophotovoltaic (MTPV) conversion device. This work used numerical simulation to investigate the effect of Micro pin fin arrays on combustion. Using a micro combustor with micro pin-fin arrays inserted, it was observed the fins widened the region of combustion and extended the blow-off limit in the combustor. The fins exerted great influence on combustion as flow rate increased and thus improved the temperature distribution of the wall. The combustor with fins possessed higher heat flux in comparison with combustor without fins. There was combustion stability at inlet velocity of 4 m/s making the micro pin-fin array configuration ideal for MTPV application. The results obtained will be useful in designing a MTPV.
Highlights
Micro-scale combustion has gained more and more attention as a kind of energy supply unit which is stable, lasting and small scaled [1] [2]
The devices so mentioned above need power sources that are portable, have short charging time, longevity, high energy density and are environmentally friendly
In order to further study the influence of fins on the micro-combustion heat transfer and combustion characteristics, the combustion of hydrogen/air in a micro-combustor with different fin arrangements was investigated by numerical simulation
Summary
Micro-scale combustion has gained more and more attention as a kind of energy supply unit which is stable, lasting and small scaled [1] [2]. Pan et al [11] studied the impact of key parameters on micro combustion in a combustor filled with porous media They concluded that the porous media material having low specific heat and high thermal conductivity gives better temperature distribution on the wall. Another means of extending the flammability limit and improvement of flame stability is the addition of catalyst. Simulation of hydrogen-air combustion in a micro combustor is presented in the configurations, where micro obstacles are embedded in the combustor in the form of micro pin-fin arrays with the idea of enhancing combustion and heat transfer efficiency in the system. In order to further study the influence of fins on the micro-combustion heat transfer and combustion characteristics, the combustion of hydrogen/air in a micro-combustor with different fin arrangements was investigated by numerical simulation
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