悬浮纳米颗粒对液体燃料着火点的影响  

Effect of suspended nano-sized particle on liquid fuel ignition

作　　者：阚伟民[1] 章先涛[2] 江浩庆 程婷[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510600 [2]武汉大学动力与机械学院,湖北武汉430072

出　　处：《热科学与技术》2015年第1期63-67,共5页Journal of Thermal Science and Technology

摘　　要：通过热平板着火实验对含有纳米悬浮颗粒的液体燃料的着火现象进行了研究。对酒精中添加不同体积分数的碳纳米管(CNT,管径40nm)、四氧化三铁以及氧化铝(直径20nm)纳米颗粒的热平板着火特性进行了研究。实验中液体燃料加入纳米颗粒后,在相同热平板温度下的着火概率明显提高,其提高的幅度主要受纳米颗粒的大小、形状以及体积分数的影响,而与纳米颗粒的材质无关。进一步的理论分析表明,着火概率提高的原因是由于液滴在高温平板表面发生剧烈的Leidenfrost相变,纳米颗粒在相变界面堆积从而改变了面附近液体的沸点。The ignition probabilities of liquid fuel mixed with nano-sized particles were experimentally examined on a heated hot-plate.Increased ignition probabilities of ethanol were found with the addition of Al2O3,Fe3O4 nanoparticle and carbon nanotube suspensions.The magnitudes are mainly affected by the parameters of size,geometry and concentration,but independent of the type of material.Further theoretical analysis indicated that the increased ignition probabilities are due to the levitation of the liquid boiling point caused by the accumulation of nanoparticles near the liquid-vapor interface.

关 键 词：平板燃烧 碳纳米管 Leidenfrost现象 纳米颗粒 着火概率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]