Experimental study on the evaporation and micro-explosion characteristics of nanofuel droplet at dilute concentrations
Experimental study on the evaporation and micro-explosion characteristics of nanofuel droplet at dilute concentrations
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稀浓度纳米燃料液滴蒸发与微爆特性实验研究
DOI：
10.1016/j.energy.2019.06.136
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发表时间：
2019-09
期刊：
影响因子：
9
通讯作者：
Sun Chunhua
中科院分区：
文献类型：
--
作者：
Wang Jigang;Qiao Xinqi;Ju Dehao;Wang Lintao;Sun Chunhua
采用高速背光成像技术研究了873 K、1 bar下纳米燃料液滴的蒸发和微爆特性。氧化铈（CeO 2）纳米粒子被用作纳米添加剂，在稀释浓度为0.05%和0.25%的重量添加到柴油。结果表明，DCe-0.05和DCe-0.25的微爆机理包括8个不同的过程：第一级气泡形成（挥发性组分引起）、多孔球壳形成、第二级气泡形成（纳米颗粒引起）、气泡团聚、微爆、稳定蒸发、纳米颗粒在液滴表面富集和致密球壳形成。然而，柴油液滴仅发生过程1、4、5和6。纳米CeO 2浓度对柴油液滴的蒸发速率有显著影响。蒸发速率随纳米颗粒浓度的增加而增加，但在稳定蒸发阶段蒸发速率降低。这是因为在液滴表面上形成致密的球壳抑制了液体燃料的扩散。DCe-0.05和DCe-0.25的微爆延滞期比柴油分别降低了24.1%和47.1%。提出了定量分析膨胀和微爆特性的两个新参数：膨胀和微爆强度。DCe-0.05和DCe-0.25的微爆强度分别提高了37.5%和49.5%。
The evaporation and micro-explosion characteristics of nanofuel droplets were investigated using high-speed backlight imaging technique at 873 K and 1 bar. Cerium oxide (CeO2) nanoparticles were utilized as nano-additives at dilute concentration of 0.05% and 0.25% by weight added to diesel. The results showed that micro-explosion mechanism of DCe-0.05 and DCe-0.25 consisted of 8 distinct processes: first class bubble formation (caused by volatile components), porous spherical shell formation, second class bubble formation (caused by nanoparticles), agglomeration of bubbles, micro-explosion, steady evaporation, concentration of nanoparticles near the droplet surface, and compact spherical shell formation. However, only processes 1, 4, 5 and 6 occurred for diesel droplets. The evaporation rate of diesel droplets were significantly affected by nano-CeO2concentrations. An increase in the evaporation rate with nanoparticle concentrations, but a decrease in the evaporation rate at steady evaporation stage. This is because the formation of a compact spherical shell on the droplet surface suppressed liquid fuel diffusion. The micro-explosion delay of DCe-0.05 and DCe-0.25 decreased by 24.1% and 47.1% compared with diesel. Two new parameters were proposed for quantitative analysis expansion and micro-explosion characteristics, namely, expansion and micro-explosion intensity. The micro-explosion intensity of DCe-0.05 and DCe-0.25 increased by 37.5% and 49.5%, respectively.
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