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Huaping Xu,Shengji Liu,Bifeng Yin,Hekun Jia,Shenghao Yu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
Although exhaust gas recirculation (EGR) is a common way to suppress the nitrogen oxide (NO X ) emissions, it also brings some negative impact on soot emissions and the thermal efficiency in internal combustion engines. We investigated the effects of ambient oxygen concentrations on engine performance, combustion characteristics, and emissions using a four-cylinder diesel engine equipped with an endoscopic visualization system. To estimate the flame temperature and soot distribution, we analyzed these images using a postprocessing program. Experimental results showed that the luminosity of flames in the images was degraded comparatively for the reduced oxygen concentration. Flame temperature distribution also showed similar behavior. As the oxygen concentration decreased, area of soot distribution significantly reduced at IMEP = 0.13 MPa, and only a slight decrease at IMEP = 0.3 MPa. But locally high soot concentration regions increased.
The presence of CH<sub>3</sub>NH<sub>2</sub> neutral species in organometal halide perovskite films
Jung, Min-Cherl,Lee, Young Mi,Lee, Han-Koo,Park, Jinwoo,Raga, Sonia R.,Ono, Luis K.,Wang, Shenghao,Leyden, Matthew R.,Yu, Byung Deok,Hong, Suklyun,Qi, Yabing American Institute of Physics 2016 APPLIED PHYSICS LETTERS Vol.108 No.7