Study of flash boiling combustion with different fuel injection timings in an optical engine using digital image processing diagnostics

FUEL

卷:284

Article

Sun, Zhe¹  Cui, Mingli¹  Nour, Mohamed^1,2  Li, Xuesong¹  Hung, David^1,3  Xu, Min¹ 

[1] Shanghai Jiao Tong Univ, Sch Mech Engn, Dongchuan Rd 800, Shanghai 200240, Peoples R China

[2] Benha Univ, Benha Fac Engn, Dept Mech Engn, Banha 13512, Egypt

[3] Shanghai Jiao Tong Univ, Univ Michigan Shanghai Jiao Tong Univ Joint Inst, Shanghai, Peoples R China

关键词: Flash boiling combustion;    Optical engine;    Injection timing;    Digital image processing diagnostics;   

DOI  :  10.1016/j.fuel.2020.119078

来源: Elsevier

【 摘 要 】

Flash boiling atomization is considered a potential solution to multiple issues encountered in fuel atomization for internal combustion engine applications. It has been demonstrated that flash boiling combustion can reduce soot emission under cold-start conditions, while the analysis was still preliminary and limited to engine cold-start conditions. This work investigates the performance of flash boiling combustion in comparison to sub-cooled spray combustions realized with the variation of injection timing. An optical engine facility was used to capture the combustion characteristics with a high-speed color camera, with the temperature of the engine coolant maintained at 60 degrees C. HSV color model and modified digital CH*/C-2* ratio (excess air intensity) to study different flame regions and local combustion richness in the optical engine. The results show that under the conditions tested, flash boiling can improve the efficiency of the engine while reducing the PN emission simultaneously. Furthermore, it was seen that flash boiling combustion could yield a faster flame speed, uniform distribution of flames and less rich mixtures. Finally, color model analysis for transient and averaged flame images is also in good agreement with actual engine performance.

【 授权许可】

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