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An optical diagnostic technique based on ultraviolet absorption and schlieren for components stratification in a binary-component fuel–air mixture
Experiments in Fluids ( IF 2.4 ) Pub Date : 2020-10-10 , DOI: 10.1007/s00348-020-03063-w
Wenyuan Qi , Yifan Zhou , Yuyin Zhang

The evaporation characteristics of multi-component fuel have significant effects on the fuel–air mixing process and subsequent processes, such as ignition, combustion, and harmful pollutants emission formation. When a multi-component fuel is directly injected into the combustion chamber, spatial and temporal equivalence ratio stratification may happen due to the preferential evaporation of components with different volatilities. However, there is a lack of effective optical diagnostics of the spatial stratification in a multi-component fuel spray. In this study, new optical technique based on ultraviolet absorption and visible light schlieren (UAVS) is for the first time proposed to measure the stratification of vapor distributions stratification in a binary-component fuel spray. UAVS technique was applied to investigate the effects of mixing ratios in a binary-component fuel spray (p-xylene and n-hexane) and ambient temperature on the stratification of components with different volatilities. The results denote the UAVS technique as the effective method for the observation of stratification of a multi-component fuel spray. In this study, the stratification phenomenon was the most evident at the ratio of 1:1. At the same time, when the ambient temperature is much higher than the dew point temperature of mixture, the stratification rarely occurs, because of the rapid evaporation thus providing time not enough for preferential evaporation. Graphic abstract

中文翻译:

一种基于紫外吸收和纹影的光学诊断技术,用于二元燃料空气混合物中的组分分层

多组分燃料的蒸发特性对燃料-空气混合过程及后续过程,如点火、燃烧和有害污染物排放的形成有显着影响。当多组分燃料直接喷入燃烧室时,由于不同挥发性组分的优先蒸发,可能会发生时空当量比分层。然而,缺乏对多组分燃料喷雾中空间分层的有效光学诊断。在这项研究中,首次提出了基于紫外线吸收和可见光纹影 (UAVS) 的新光学技术来测量二元组分燃料喷雾中的蒸汽分布分层。应用 UAVS 技术研究了双组分燃料喷雾(对二甲苯和正己烷)中的混合比和环境温度对具有不同挥发性的组分分层的影响。结果表明 UAVS 技术是观察多组分燃料喷雾分层的有效方法。在本研究中,分层现象在比例为 1:1 时最为明显。同时,当环境温度远高于混合物的露点温度时,很少发生分层,因为蒸发很快,因此没有足够的时间进行优先蒸发。图形摘要 结果表明 UAVS 技术是观察多组分燃料喷雾分层的有效方法。在本研究中,分层现象在比例为 1:1 时最为明显。同时,当环境温度远高于混合物的露点温度时,很少发生分层,因为蒸发很快,因此没有足够的时间进行优先蒸发。图形摘要 结果表明 UAVS 技术是观察多组分燃料喷雾分层的有效方法。在本研究中,分层现象在比例为 1:1 时最为明显。同时,当环境温度远高于混合物的露点温度时,很少发生分层,因为蒸发很快,因此没有足够的时间进行优先蒸发。图形摘要 由于快速蒸发,因此提供的时间不足以进行优先蒸发。图形摘要 由于快速蒸发,因此提供的时间不足以进行优先蒸发。图形摘要
更新日期:2020-10-10
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