دورية أكاديمية
Cool flame wave propagation in high-pressure spray flames
| العنوان: | Cool flame wave propagation in high-pressure spray flames |
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| المؤلفون: | Zhong, Shenghui, Xu, Shijie, Zhang, Fan, Peng, Zhijun, Chen, Longfei, Bai, Xue Song |
| المصدر: | Proceedings of the Combustion Institute; 39(2), pp 2513-2522 (2023) ; ISSN: 1540-7489 |
| بيانات النشر: | Elsevier |
| سنة النشر: | 2023 |
| المجموعة: | Lund University Publications (LUP) |
| مصطلحات موضوعية: | Energy Engineering, Cool flame wave propagation, Engine combustion network, Eulerian stochastic field, Spray combustion, Two-stage ignition |
| الوصف: | Cool flame has an important impact on the performance and emission of advanced low-temperature combustion (LTC) internal combustion engines (ICEs) in which the liquid fuel is injected earlier at a lower ambient temperature (Tam) than that in the conventional diesel combustion engines. However, the cool flame characteristics of spray combustion under ICEs conditions are not fully understood, e.g., the effect of cool flame on the spray ignition and flame stabilization is not well studied. In this paper, the so-called cool flame wave propagation (CFWP) in the Engine Combustion Networks Spray A flames at three ambient temperatures Tam (800 K, 900 K and 1000 K) is analyzed using the data from large eddy simulation with an improved Eulerian based transported probability density function sub-grid combustion model. A good agreement between the LES results and experimental data is obtained for the spray liquid penetration length, vapor fuel penetration length, mean pressure rise profile, and flame liftoff length. It is shown that CFWP in the spray ignition process promotes the ignition of the fuel-rich and cold reactant mixture, leading to the most reactive mixture shifting toward fuel-richer locations due to the spatial stratification of temperature and concentration, and turbulent mixing. As a result, the high temperature ignition (HTI) can be shortened compared to the ignition in the homogeneous mixture. At Tam = 800 K, the HTI kernels are consistently formed following the CFWP propagating toward the spray head region. However, as Tam increases, the spatial correlation between HTI kernels and CFWP fronts is weakened. On the other hand, the turbulent mixing (quantified using local scalar dissipation rate) contributes more to the formation of HTI kernels at higher Tam. The present results indicate that CFWP is more profound at lower Tam in the spray ignition process. Finally, it is found that cool flame propagates mainly into pre-reacted fuel-rich mixture in an ignition wave propagation mode from the spray upstream ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://lup.lub.lu.se/record/29dd9370-ba7f-4707-9187-a2ab7f4e2404Test; http://dx.doi.org/10.1016/j.proci.2022.08.056Test; scopus:85140830216 |
| DOI: | 10.1016/j.proci.2022.08.056 |
| الإتاحة: | https://doi.org/10.1016/j.proci.2022.08.056Test https://lup.lub.lu.se/record/29dd9370-ba7f-4707-9187-a2ab7f4e2404Test |
| رقم الانضمام: | edsbas.1DB3BE75 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.proci.2022.08.056 |
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