CAJ | 학술논문

采用荷电喷雾燃烧技术是促进微尺度下液体燃料稳定燃烧的重要方法。使用乙醇为燃料，在新型结构的喷嘴内径为0.8 mm微尺度单电极燃烧器内，进行了荷电雾化与燃烧特性的实验研究。结果表明：荷电雾化会随喷嘴电压升高而出现4种模式，对应的荷质比在脉动模式下最低，到达锥-射流模式后出现跃升，在锥-射流模式下最为稳定。荷电雾化后的乙醇在燃烧器网格处稳定燃烧，火焰温度随着当量比增大先上升后下降。火焰温度在当量比=1.0时达到最高值，且随电压增大而上升。锥-射流模式下，当量比=1.0时，燃烧效率可达89%，燃料转换效率可达90%。稳定的雾化模式以及合适的当量比，对燃烧效果具有较大的改善作用。
채용하전분무연소기술시촉진미척도하액체연료은정연소적중요방법。사용을순위연료，재신형결구적분취내경위0.8 mm미척도단전겁연소기내，진행료하전무화여연소특성적실험연구。결과표명：하전무화회수분취전압승고이출현4충모식，대응적하질비재맥동모식하최저，도체추-사류모식후출현약승，재추-사류모식하최위은정。하전무화후적을순재연소기망격처은정연소，화염온도수착당량비증대선상승후하강。화염온도재당량비=1.0시체도최고치，차수전압증대이상승。추-사류모식하，당량비=1.0시，연소효솔가체89%，연료전환효솔가체90%。은정적무화모식이급합괄적당량비，대연소효과구유교대적개선작용。
Electro-spraying is an important technique to enhance combustion of liquid fuel in micro-scale. A new combustor with nozzle diameter of 0.8 mm and single electrode was designed and fabricated. Experimental studies on electro-spraying and combustion were carried out using alcohol as fuel. Results showed four different electro-spraying modes with the variation of nozzle potential. The specific charges were measured at different electro-spraying modes, which were lower at the pulsed-jet mode, increased greatly, and reached a stable value at the cone-jet mode. The atomized alcohol was ignited and combusted stably near the mesh, which can be regarded as a flame holder. The flame temperatures increased first and then decreased with the increase of equivalent ratio. The flame temperature reached the maximum value at the equivalent ratio of 1.0, and the maximum value increased with the increase of nozzle potential. At the equivalent ratio of 1.0, the combustion efficiency reached 89% and fuel conversion efficiency reached 90% at cone-jet mode. The stable electro-spraying mode and suitable equivalent ratio are very important to the enhancement of combustion of alcohol in micro-scale.