Study of Visualization Experiment on the Influence of Injector Nozzle Diameter on Diesel Engine Spray Ignition and Combustion Characteristics

Yuanzhi Tang, Diming Lou, Chengguan Wang, Pi-qiang Tan, Zhiyuan Hu, Yunhua Zhang and Liang Fang
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Yuanzhi Tang: School of Automotive studies, Tongji University, Shanghai 201804, China
Diming Lou: School of Automotive studies, Tongji University, Shanghai 201804, China
Chengguan Wang: School of Automotive studies, Tongji University, Shanghai 201804, China
Pi-qiang Tan: School of Automotive studies, Tongji University, Shanghai 201804, China
Zhiyuan Hu: School of Automotive studies, Tongji University, Shanghai 201804, China
Yunhua Zhang: School of Automotive studies, Tongji University, Shanghai 201804, China
Liang Fang: School of Automotive studies, Tongji University, Shanghai 201804, China

Energies, 2020, vol. 13, issue 20, 1-18

Abstract: The elementary research of spray and combustion is of great significance to the development of compactness of modern diesel engines. In this paper, three injectors with different nozzle orifice diameters (0.23 mm, 0.27 mm and 0.31 mm) were used to study the diesel spray, ignition and flame-wall impingement visualization experiment. This paper studied the influence of different nozzle sizes on the trends of spray, ignition and flame diffusion under the flame-wall impinging combustion and used the flame luminosity to characterize the soot generation in combustion. By analyzing the quantitative data, such as spray penetration, ignition delay, flame area and flame luminosity systematically, it was shown that the smaller nozzle benefitted diesel combustion to some extent. The 0.23 mm nozzle injector in these experiments had the best fuel-air mixing effect under 800 K. The length of the spray liquid under the 0.23 mm nozzle condition was 19% and 23% shorter than that of 0.27 and 0.31 mm, respectively. Smaller orifice size of the nozzle can help to reach the gas ignition conditions more effectively. Without liquid fuel impingement, the simple flame-wall impingement will not change the trend of the nozzle influence on combustion. The total amount of accumulated soot according to the approximate luminosity spatial integral calculation in the combustion process was reduced by 37% and 43% under 0.27 mm and 0.23 mm nozzles, respectively, which is favorable for the clean combustion of diesel engines.

Keywords: visualization experiment; constant volume combustion vessel; evaporative spray; flame-wall impinging combustion; flame luminosity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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