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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 of liquid fuel containing nano-sized suspended particles was investigated by hot plate fire test. The ignition characteristics of hot slabs with different volume fractions of carbon nanotubes (CNTs, 40 nm diameter), ferroferric oxide and alumina (20 nm diameter) nanoparticles were investigated. After the liquid fuel was added into the nanoparticles, the probability of ignition at the same hot plate temperature was significantly increased. The magnitude of the increase was mainly affected by the size, shape and volume fraction of the nanoparticles, but not with the material of the nanoparticles. Further theoretical analysis shows that the reason for the increase in the probability of ignition is due to the intense Leidenfrost transformation of droplets on the plateau of high temperature and the accumulation of nanoparticles at the phase change interface to change the boiling point of the liquid near the surface.