臺灣大學: 機械工程學研究所潘國隆陳劭軒Chen, Shao-SyuanShao-SyuanChen2013-04-012018-06-282013-04-012018-06-282012http://ntur.lib.ntu.edu.tw//handle/246246/255653本研究主要是以提升燃燒效率為主軸，以供應氧氣來改變可燃混合氣體中含氧量的比例，固定使用不鏽鋼材質的多孔介質圓柱管為燃燒器，其直徑為13.7 mm、長度為80 mm、孔隙口徑為40 μm以及孔隙率69%。利用多孔介質之特性產生穩定的火焰，並藉由量測火焰的溫度分布以及拍取火焰之化學反應所激發的螢光圖像作為研究火焰內部結構。火焰的溫度分布顯示圓柱之燃料出口處會有相對高溫存在，以及在火焰外圍輪廓線周圍也存有高溫，相對於攫取化學螢光之圖像，圓柱之燃料出口處確實有強烈反應呈現，而且火焰外圍輪廓線的區域也有呈現出相對強烈螢光。隨著當量比越接近貧油，圓柱外圍反應越微弱，同時圓柱周圍的反應反而更強烈，對照於溫度分布圖也顯示出相似的機制，增強含氧量的可燃氣體所燃燒的現象，會使火焰的變化更快發生，並提高貧油可燃極限之範圍。接著，利用強制流場對火焰進行吹熄之動作，藉由此研究方式，表現出火焰結構強度的差別。在當量比接近1時，火焰需要最高風速才可吹熄，表示火焰的燃燒模式在此時最為強烈，提高含氧量會使火焰燃燒速度更快，讓火焰對強制流場的阻抗能力加強，更不容易熄滅。經由以上的研究方式，了解加入氧氣對多孔介質圓柱燃燒機制產生之火焰的影響以及提升燃燒效率的變化程度，並以增加含氧量的方式，相較低含氧量、相同當量比的火焰，燃燒更加穩定。This experiment investigated the effect of oxygen-enhanced combustion over a cylindrical porous medium burner. The diameter, length, pore diameter, and porosity air 13.7 mm, 80 mm, 40 μm and 69%, respectively. The porous media was used to produce a stable flame, and internal structure of the flame was investigated by measuring the flame temperature distribution and obtaining the CH* and C2* chemiluminescence images. The results revealed that relatively high temperature existed at the exit of the cylindrical burner, and the high temperature zone surrounded the flame contour. The chemiluminescence image was compared with temperature distribution of the flame, and the result showed that the position with more intensive fluorescence and the high temperature zone are coincident. The temperature and the chemical reaction intensity increased as the equivalence ratio decreased, if above 0.8. To increase the efficiency of combustion, oxygen was added in the combustible gas, leading to higher sensitivity of flame variation and extended lean limit of flammability. The flame was then placed in a forced flow field so as to contrast the difference in the strength of flame structure. When the equivalence ratio approached one, the flame required much faster wind velocity to blow off because the burning velocity was higher. The burning velocity was enhanced by increasing the oxygen proportion, and then the resistance of the flame to extinction was also enhanced. From the above experimental results, it is concluded that the oxygen-enhanced premixed flame is more stable when the equivalence ratio is the same but the oxygen content is higher.4995972 bytesapplication/pdfen-US富氧燃燒貧油可燃極限多孔圓柱燃燒器化學螢光法oxygen-enhanced combustionthe lean flammability limitthe porous cylindrical burnerchemiluminescencethesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/255653/1/ntu-101-R99522321-1.pdf