Premixed wake flame in a porous cylindrical burner

• Main Authors: Wen-Chang Lin, 林文昌
• Other Authors: Kuo-Long Pan
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/76549482211516760762

碩士 === 臺灣大學 === 機械工程學研究所 === 98 === An experimental study to investigate the effect of the forced convection and natural convection flow field on the combustion of cylindrical porous medium is presented. The lean combustion using the cylindrical porous medium as burner ejected the mixing air-fuel uniformly to produce a stable flame. In addition, using different L/D to determine the lean flammability limits value、heat loss and flame stability mechanism between the single cylinder burner and double cylinder burner has been discussed in this study. The result shows that the cylinder diameter is the negative correlation of gradient velocity. The increasing gradient of flame extinction velocity is relative a decreasing L/D. In natural convective fluid field, the lean flammability limit of premixed flame combustion is 0.33; in forced convective fluid field, single cylindrical burner of the lean flammability limit of premixed flame combustion is 0.39. Double cylindrical burner of the lean flammability limit of premixed flame combustion and L/D are related. When L/D=1.02、1.2、1.4,the double cylindrical burner of the lean flammability limit of premixed flame combustion are 0.33、0.37、0.39. lean flammability limit is corresponded the objective of expanding lean flammability limit by flame interaction.