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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigations on nucleation, bubble growth, and micro-explosion characteristics during the combustion of ethanol/Jet A-1 fuel droplets
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Experimental investigations on nucleation, bubble growth, and micro-explosion characteristics during the combustion of ethanol/Jet A-1 fuel droplets

机译：乙醇/喷射A-1燃料液滴燃烧过程中核肉，泡沫生长和微爆炸特性的实验研究

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Highlights?Characteristics of disruptive burning in ethanol/Jet A-1 blended droplets are studied.?The probability of micro-explosion increases with proportion of ethanol in the blend.?Secondary and tertiary micro-explosion occurrs in ejected droplets leading to further atomization of the droplet.?The SMD of secondary droplets is around 20% of the parent droplet.AbstractThe combustion characteristics of ethanol/Jet A-1 fuel droplets having three different proportions of ethanol (10%, 30%, and 50% by vol.) are investigated in the present study. The large volatility differential between ethanol and Jet A-1 and the nominal immiscibility of the fuels seem to result in combustion characteristics that are rather different from our previous work on butanol/Jet A-1 droplets (miscible blends). Abrupt explosion was facilitated in fuel droplets comprising lower proportions of ethanol (10%), possibly due to insufficient nucleation sites inside the droplet and the partially unmixed fuel mixture. For the fuel droplets containing higher proportions of ethanol (30% and 50%), micro-explosion occurred through homogeneous nucleation, leading to the ejection of secondary droplets and subsequent significant reduction in the overall droplet lifetime. The rate of bubble growth is nearly similar in all the blends of ethanol; however, the evolution of ethanol vapor bubble is significantly faster than that of a vapor bubble in the blends of butanol. The probability of disruptive behavior is considerably higher in ethanol/Jet A-1 blends than that of butanol/Jet A-1 blends. The Sauter mean diameter of the secondary droplets produced from micro-explosion is larger for blends with a higher proportion of ethanol. Both abrupt explosion and micro-explosion create a large-scale distortion of the flame, which surrounds the parent droplet. The secondary droplets generated from abrupt explosion undergo rapid evaporation whereas the secondary droplets from micro-explosion carry their individual flame and evaporate slowly. The growth of vapor bubble was also witnessed in the secondary droplets, which leads to the further breakup of the droplet (puffing/micro-explosion).]]>
机译：<！[cdata [ 亮点 ？ 研究了乙醇/喷射A-1混合液滴中破坏性燃烧的特性。 ？ 概率混合物中的乙醇比例增加了微爆炸。 ？ 次级和三级微爆炸发生在喷射液滴中，导致液滴的进一步雾化。 ？ 次级液滴的SMD约为父液滴的20％。 抽象 乙醇/射流A-1燃料液滴的燃烧特性具有三种不同比例的乙醇（在本研究中调查了10％，30％和50％。）。乙醇和喷射A-1之间的大挥发性差异和燃料的标称不混溶性似乎导致燃烧特性与我们之前的丁醇/喷射A-1液滴（可混合混合物）的工作相当不同。在燃料液滴中促进了突然爆炸，包括较低比例的乙醇（10％），可能是由于液滴内的核切割位点和部分未混合的燃料混合物的核心位点不足。对于含有较高比例的乙醇（30％和50％）的燃料液滴，通过均匀成核发生微爆炸，导致次级液滴喷射并随后在整个液滴寿命的显着降低。在乙醇的所有共混物中，气泡生长速率几乎相似;然而，乙醇蒸气泡的演化比丁醇共混物中的蒸气泡的变速显着快。乙醇/喷射A-1共混物的破坏性行为的概率比丁醇/射流A-1共混物的混合物相当高。由微爆炸产生的二级液滴的燃烧器平均直径对于具有较高比例的乙醇的混合物更大。突然爆炸和微爆炸既突然造成了火焰的大规模变形，围绕父液滴。从突然爆炸产生的次级液滴经历了快速蒸发，而微爆炸的二级液滴携带它们的单独的火焰并缓慢蒸发。蒸汽泡的生长也在二级液滴中见到，这导致液滴的进一步分解（膨化/微爆炸）。 ]]>

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