A liquid film or droplet of miscible binary fuel burning on a heated surface at elevated pressures
A liquid film or droplet of miscible binary fuel burning on a heated surface at elevated pressures
复制标题
DOI：
10.1016/j.proci.2008.06.080
复制
发表时间：
2009
影响因子：
4.4
通讯作者：
D. Segawa;T. Kadota;S. Nakaya;Kazumasa Takemura;Taketsugu Sasaki
中科院分区：
文献类型：
--
作者：
D. Segawa;T. Kadota;S. Nakaya;Kazumasa Takemura;Taketsugu Sasaki
本文对可混溶二元燃料在高压加热表面上的燃烧和蒸发进行了实验研究。通过摄影观察，阐明了二元燃料液滴或液膜在加热表面上的行为，并获得了特征寿命随表面温度、环境压力和燃料中高挥发性组分初始浓度的变化关系。测试的二元燃料是正己烷和正癸烷的混合物。结果表明，正己烷/正癸烷在加热表面上的燃烧和蒸发寿命曲线在低压下都有两个峰值，第一个峰值在薄膜型蒸发区，第二个峰值在球状蒸发区。高挥发性组分的优先蒸发是导致第一个峰出现在膜型蒸发区的原因。第二座山峰，对应莱顿弗罗斯特点。环境压力的增加导致寿命曲线向更高的表面温度移动，并且在两个峰值处寿命降低。寿命曲线随着表面温度的升高而单调下降，在较高的压力下没有观察到球状蒸发。高挥发性组分的初始浓度的增加导致第一峰向较高的表面温度移动，其寿命降低，第二峰向较低的表面温度轻微移动。燃烧引起的第一峰附近的寿命和在球状型蒸发区和第一峰的表面温度略有增加，而在第二峰的表面温度几乎保持不变的显着减少。
An experimental study has been made of the combustion and evaporation of miscible binary fuels on a heated surface at elevated pressures. Photographic observation was made for elucidating how the binary fuel droplets or films behaved on the heated surface and for obtaining the characteristic lifetime as a function of the surface temperature, the ambient pressure and the initial concentration of highly volatile component of the fuels. The binary fuels tested were mixtures of n-hexane and n-decane. The results showed that the lifetime curve both for the combustion and for the evaporation of n-hexane/n-decane on the heated surface had two peaks at lower pressures, the first peak in the film-type evaporation region and the second peak in the spheroid-type evaporation region. The preferential evaporation of the highly volatile component was responsible for the appearance of the first peak in the film-type evaporation region. The second peak corresponded to Leidenfrost point. The increase in the ambient pressure caused a shift of the lifetime curve toward higher surface temperature and a decrease in the lifetime at two peaks. The lifetime curve decreased monotonically with increasing the surface temperature and the spheroid-type evaporation was not observed at higher pressures. The increase in the initial concentration of highly volatile component caused a shift of the first peak toward higher surface temperature, a decrease in its lifetime and a slight shift of the second peak toward lower surface temperature. The combustion caused a remarkable decrease in the lifetimes around the first peak and in the spheroid-type evaporation region and a slight increase in the surface temperature at the first peak, while the surface temperature at the second peak remained almost unchanged.