Research on Combustion Process of Small Air-cooled Diesel Engine Based on Emission Characteristics

doi:10.3969/j.issn.1000-1093.2017.12.023

Abstract

Abstract: Higher CO and HC emissions of small air-cooled diesel engine are due to the compact structure and high cooling intensity at small and medium loads. To explore the generation mechanisms of CO and HC, and meet China Ⅲ emission standard of non-road diesel engines, the emission characteristics of pollutants under different compression ratios and exhaust gas recirculation test conditions are studied for an 186F air-cooled diesel engine. The results show that the change in the specific emission of NO_x is less than 4%, but the changes in the specific emissions of CO and HC are 41.1% and 53.9%, respectively, at two different compression ratios, which are 19.5% and 22.5%, respectively, without EGR. Through the analysis of indicator diagrams, it is concluded that the production of CO and HC is mainly related to the compression temperature during ignition delay. CO and HC emissions can be efficiently decreased when the temperature at the end of compression reaches to 860 K under 10% load. The emission values can be lower than the emission limits of CHINA Ⅲ emission standard based on the different technical schemes and the optimization of combustion process. Key

Key words: powermachineryengineering, smallair-cooleddieselengine, combustion, emission, temperature

CLC Number:

TK421⁺.27

LIU Sheng-ji， ZHAO Yu-chao， LIU Rong-li, WANG Jian， SUN Yong-fu. Research on Combustion Process of Small Air-cooled Diesel Engine Based on Emission Characteristics[J]. Acta Armamentarii, 2017, 38(12): 2480-2487.

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第38卷第12期
2017 年12月兵工学报ACTA
ARMAMENTARIIVol.38No.12Dec.2017

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