期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 11, 页码 8253-8268出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.12.022
关键词
Energy and exergy analysis; Dual-fuel engine; Combined injection; Hydrogen direct injection; Lean-burn combustion
资金
- National Natural Science Foundation of China [51976076]
- National Engineering Laboratory for Mobile Source Emission Control Technology [NELMS2018A19]
This paper investigates the energy and exergy balance of a SI engine working under two different modes under lean-burn conditions. Results show that the cooling water takes an average of 39.40% of the fuel energy in GPI + GDI mode, and 40.70% in GPI + HDI mode. The exergy destruction occupies 56.12% of the fuel exergy in GPI + GDI mode and 54.89% in GPI + HDI mode. Brake thermal efficiency and exergy efficiency of the engine can be improved by 0.29% and 0.31% in GPI + GDI mode, and 0.56% and 0.71% in GPI + HDI mode at an excess air ratio of 1.1.
Hydrogen is considered to be a suitable supplementary fuel for Spark Ignition (SI) engines. The energy and exergy analysis of engines is important to provide theoretical fundaments for the improvement of energy and exergy efficiency. However, few studies on the energy and exergy balance of the engine working under Hydrogen Direct Injection (HDI) plus Gasoline Port Injection (GPI) mode under lean-burn conditions are reported. In this paper, the effects of two different modes on the energy and exergy balance of a SI engine working under lean-burn conditions are presented. Two different modes (GPI + GDI and GPI + HDI), five gasoline and hydrogen direct injection fractions (0, 5%, 10%, 15%, 20%), and five excess air ratios (1, 1.1, 1.2, 1.3, 1.4) are studied. The results show that the cooling water takes the 39.40% of the fuel energy on average under GPI + GDI mode under lean-burn conditions, and the value is 40.70% for GPI + HDI mode. The exergy destruction occupies the 56.12% of the fuel exergy on average under GPI + GDI mode under lean-burn conditions, and the value is 54.89% for GPI + HDI mode. The brake thermal efficiency and exergy efficiency of the engine can be improved by 0.29% and 0.31% at the excess air ratio of 1.1 under GPI + GDI mode on average, and the average values are 0.56% and 0.71% for GPI + HDI mode. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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