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Acta Armamentarii ›› 2018, Vol. 39 ›› Issue (3): 436-443.doi: 10.3969/j.issn.1000-1093.2018.03.003

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Performance Optimization of Heavy-duty Diesel Engine in Plateau Environment

TAN Pi-qiang1, WANG De-yuan1, WANG Cheng-guan1, LI Yuan1, LOU Di-ming1, LI Yun-guang2, LIU Sheng2, YANG Zhen-huan2   

  1. (1.School of Automotive Studies, Tongji University, Shanghai 201804, China; 2.China North Engine Research Institute, Datong 037036, Shanxi, China)
  • Received:2017-08-21 Revised:2017-08-21 Online:2018-05-07

Abstract: The performances of different fuel-air-chamber matching schemes at different altitudes are optimized for a heavy-duty diesel engine. The results show that, with the increase in altitude, the actual operating conditions of diesel engine are shifted from low speed and low load to high speed and high load. The five schemes are presented, such as Scheme A (swirl ratio of 2.2, 10 × 0.32 mm injector, and compression ratio of 13.3), Scheme B (swirl ratio of 2.2, 10 × 0.32 mm injector, and compression ratio of 14.1), Scheme C (swirl ratio of 1.5, injector 10 × 0.32 mm, and compression ratio of 13.3), Scheme D (swirl ratio of 1.5, 10 × 0.32 mm injector, and compression ratio of 14.1), and Scheme E (swirl ratio of 1.5, 10 × 0.30 mm injector, and compression ratio of 14.1). Simulated and experimental results show that the fuel-air-chamber matching condition of diesel engine in plateau environment can be improved by appropriately increasing the compression ratio, reducing the swirl ratio and selecting the appropriate nozzle diameter. The difference between the internal and external equivalent ratios of the best scheme is smaller. The fuel-air-chamber optimization of the best scheme is optimal, and the power, economy and emission performance of diesel engine are improved. Key

Key words: heavy-dutydieselengine, plateauenvironment, performance, optimization

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