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Experimental and theoretical analysis of the combustion process at low loads of a diesel natural gas dual-fuel engine

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  • Li, Weifeng
  • Liu, Zhongchang
  • Wang, Zhongshu

Abstract

To construct an effective method to analyze the combustion process of dual fuel engines at low loads, effects of combustion boundaries on the combustion process of an electronically controlled diesel natural gas dual-fuel engine at low loads were investigated. Three typical combustion modes, including h, m and n, appeared under different combustion boundaries. In addition, the time-sequenced characteristic and the heat release rate-imbalanced characteristic were found in the dual fuel engine combustion process. To quantify these characteristics, two quantitative indicators, including the TSC (time-sequenced coefficient) and the HBC (HRR-balanced coefficient) were defined. The results show that increasing TSC and HBC can decrease HC (hydrocarbon) emissions and improve the BTE (brake thermal efficiency) significantly. The engine with the n combustion mode can obtain the highest BTE and the lowest HC emissions, followed by m, and then h. However, the combustion process of the engine will deteriorate sharply if boundary conditions are not strictly controlled in the n combustion mode. Based on the n combustion mode, advancing the start of diesel injection significantly, using large EGR (exhaust gas recirculation) rate and appropriately intake throttling can effectively reduce HC emissions and improve the BTE of dual fuel engines at low loads with relatively high natural gas PES (percentage energy substitution).

Suggested Citation

  • Li, Weifeng & Liu, Zhongchang & Wang, Zhongshu, 2016. "Experimental and theoretical analysis of the combustion process at low loads of a diesel natural gas dual-fuel engine," Energy, Elsevier, vol. 94(C), pages 728-741.
    • Handle: RePEc:eee:energy:v:94:y:2016:i:c:p:728-741
    DOI: 10.1016/j.energy.2015.11.052
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    17. Han, Zhiqiang & Li, Bolun & Tian, Wei & Xia, Qi & Leng, Songpeng, 2019. "Influence of coupling action of oxygenated fuel and gas circuit oxygen on hydrocarbons formation in diesel engine," Energy, Elsevier, vol. 173(C), pages 196-206.
    18. Wang, Zhongshu & Chen, Wenjing & Wang, Dan & Tan, Manzhi & Liu, Zhongchang & Dou, Huili, 2016. "A novel combustion evaluation method based on in-cylinder pressure traces for diesel/natural gas dual fuel engines," Energy, Elsevier, vol. 115(P1), pages 1130-1137.
    19. Yousefi, Amin & Birouk, Madjid, 2017. "Investigation of natural gas energy fraction and injection timing on the performance and emissions of a dual-fuel engine with pre-combustion chamber under low engine load," Applied Energy, Elsevier, vol. 189(C), pages 492-505.
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    21. Min Zhang & Wanhua Su & Zhi Jia, 2024. "Study of Efficient and Clean Combustion of Diesel–Natural Gas Engine at Low Loads with Concentration and Temperature Stratified Combustion," Energies, MDPI, vol. 17(17), pages 1-22, August.

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