Comparison of multicomponent fuel droplet vaporization experiments in forced convection with the Sirignano model
Comparison of multicomponent fuel droplet vaporization experiments in forced convection with the Sirignano model
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DOI：
10.1016/s0894-1777(98)10035-3
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发表时间：
1998-12
影响因子：
3.2
通讯作者：
A. Daïf;M. Bouaziz;X. Chesneau;A. Cherif
中科院分区：
文献类型：
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作者：
A. Daïf;M. Bouaziz;X. Chesneau;A. Cherif
对多组分燃料液滴在加热流动中的汽化过程进行了实验研究，并与Abramzon和Sirignano提出的模型进行了比较。液滴被悬浮在一个永久性支架上，该支架设置在一个热风洞中。这个风洞配备了一个录像系统和一个红外线摄像机。记录在打开热风流阻尼器之前将液滴悬浮在固定器上的时间。第一个序列对应于自然对流中的液滴蒸发，其初始实验条件，特别是液滴的直径、温度、成分是众所周知的。然后打开阻尼器，开始强制对流序列。视频系统记录了液滴的初始直径。这第二个序列的其他初始条件不能通过实验确定。液滴中的温度分布和表面温度、液滴中的质量分数分布和表面质量分数是未知的。这些未知参数是通过将我们的实验与使用自然对流中的“膜概念”的模型相结合来确定的。将实验结果与计算结果进行了比较，在自然对流和强迫对流中都得到了满意的结果。该方法在不同初始浓度和自然对流中不同持续时间的燃料混合物液滴(正庚烷-正庚烷)的情况下进行了测试。
The vaporization of multicomponent fuel droplets was studied experimentally in a heated flow and the results were compared to the model proposed by Abramzon and Sirignano. The droplet was suspended on a permanent holder which was set up in a thermal wind-tunnel. This wind-tunnel was fitted with a video recording system and an infra-red camera. The period during which the droplet was suspended on the holder before the opening of the hot air flow damper was recorded. This first sequence corresponds to the droplet vaporization in natural convection, whose initial experiment conditions, especially diameter, temperature, composition of the droplet, are well known. Then the damper was turn on, and the sequence of forced convection begun. The initial diameter of the droplet was recorded by the video system. The other initial conditions of this second sequence cannot be determined experimentally. The distribution of temperature in the droplet and the surface temperature, the mass fraction distribution in the droplet and the surface mass fraction were unknown. These unknown parameters were determined by coupling our experiment with a model using “the film concept” in natural convection. Experimental results were compared with the calculations and found satisfactory, in natural convection as well as in forced convection initiated by this method. The method was tested in the case of a fuel mixture droplets (heptane–decane) for different initial concentrations and variable durations of the sequence in natural convection.