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Energies 2017, 10(8), 1109; https://doi.org/10.3390/en10081109

Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions

1
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
3
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Wenming Yang
Received: 14 April 2017 / Revised: 29 June 2017 / Accepted: 11 July 2017 / Published: 31 July 2017
(This article belongs to the Special Issue Internal Combustion Engines)
View Full-Text   |   Download PDF [12673 KB, uploaded 31 July 2017]   |  

Abstract

The combination of emulsified diesel and low temperature combustion (LTC) technology has great potential in reducing engine emissions. A visualization study on the spray and combustion characteristics of water emulsified diesel was conducted experimentally in a constant volume chamber under conventional and LTC conditions. The effects of ambient temperature on the evaporation, ignition and combustion characteristics of water emulsified diesel were studied under cold, evaporating and combustion conditions. Experimental results showed that the ambient temperature had little effect on the spray structures, in terms of the liquid core length, the spray shape and the spray area. However, higher ambient temperature slightly reduced the Sauter Mean Diameter (SMD) of the spray droplets. The auto-ignition delay time increased significantly with the decrease of the ambient temperature. The ignition process always occurred at the entrainment region near the front periphery of the liquid core. This entrainment region was evolved from the early injected fuel droplets which were heated and mixed by the continuous entrainment until the local temperature and equivalence ratio reached the ignition condition. The maximum value of integrated natural flame luminosity (INFL) reduced by 60% when the ambient temperature dropped from 1000 to 800 K, indicating a significant decrease of the soot emissions could be achieved by LTC combustion mode than the conventional diesel engines. View Full-Text
Keywords: water emulsified diesel; ambient temperature; evaporation; ignition; low temperature combustion water emulsified diesel; ambient temperature; evaporation; ignition; low temperature combustion
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Wang, Z.; Wu, S.; Huang, Y.; Chen, Y.; Shi, S.; Cheng, X.; Huang, R. Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions. Energies 2017, 10, 1109.

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