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Experimental investigation on the effect of equivalence ratio on the development of cellular structure of E30-air mixture
Experimental Thermal and Fluid Science ( IF 3.2 ) Pub Date : 2020-12-24 , DOI: 10.1016/j.expthermflusci.2020.110330
Chenghan Sun , Yikai Li , Zechang Liu , Xu He , Fushui Liu

Ethanol is a renewable, clean fuel and is usually blended with gasoline to be used as an alternative fuel for internal combustion engines. In the present study, the instability development and cellular structure evolution of a spherically expanding flame of E30 (gasoline blended with ethanol of 30% liquid volume) are investigated. By processing the flame images, the equivalent diameters of cells on the flame surface are calculated to describe and explain the development of the cellular structure. The results show that with the propagation of flame, the size of the cellular structure generally increases first and then decreases. Eventually, the mean equivalent diameter of cells tends to a constant value, and these small cells are uniformly distributed over the entire flame surface. The effect of equivalence ratio on the flame instability is studied as well. As the equivalence ratio increases, the cellular structure development is advanced and the cell size is smaller, which indicates that the flame instability is enhanced. The critical wave number is almost the same, while the critical Peclet number approximately followed a linear decrease. The experimental measurement of the sensitivity of Pecr to equivalence ratio was verified by the theoretical results and the linear equation is proposed.



中文翻译:

当量比对E30-空气混合物孔结构发展影响的实验研究

乙醇是一种可再生的清洁燃料,通常与汽油混合,用作内燃机的替代燃料。在本研究中,研究了E30(汽油与30%液体体积的乙醇混合汽油)的球形膨胀火焰的不稳定性发展和细胞结构演变。通过处理火焰图像,计算出火焰表面上的细胞等效直径,以描述和解释细胞结构的发展。结果表明,随着火焰的传播,泡孔结构的大小通常先增大然后减小。最终,孔的平均当量直径趋于恒定值,并且这些小孔均匀地分布在整个火焰表面上。还研究了当量比对火焰不稳定性的影响。随着当量比的增加,泡孔结构发展加快并且泡孔尺寸变小,这表明火焰不稳定性增强。临界波数几乎相同,而临界Peclet数大约跟随线性下降。实验测量的灵敏度PE 理论结果验证了其当量比,并提出了线性方程。

更新日期:2021-01-20
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