| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 97 === Porous burner is known to be one of the heat recirculation method used in modern combustion systems. In general, it has the ability to stabilize flame and to increase the combustion efficiency by recirculating heat from the combustion zone. However, few studies have been made to investigate the combustion performance by using hydrogen as fuel. To examine the combustion characteristic, a series test of measurement was made including pressure drop, temperature variation, stable velocity region, and lean flammability limit. Experimental parameters included flow rate, fuel concentration, and pore density of the porous media. It was found that a larger downstream pore size could shorten the time of porous burner to get steady and had a good ability to stabilize the flame in the combustion region. Besides, SVR of a porous burner became extremely wider when the fuel concentrations in each case exceeded some particular value. The results show that it can be found at some particular condition or at some porous set-up to induce a good combustion performance of porous burner.
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