Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions
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 conventi...
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doaj-43810805dd50417ab7b623256e1c4a0a2020-11-25T01:05:47ZengMDPI AGEnergies1996-10732017-07-01108110910.3390/en10081109en10081109Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion ConditionsZhaowen Wang0Shang Wu1Yuhan Huang2Yulin Chen3Shuguo Shi4Xiaobei Cheng5Ronghua Huang6State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaSchool of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, AustraliaDepartment of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720, USAState Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaThe 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.https://www.mdpi.com/1996-1073/10/8/1109water emulsified dieselambient temperatureevaporationignitionlow temperature combustion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhaowen Wang Shang Wu Yuhan Huang Yulin Chen Shuguo Shi Xiaobei Cheng Ronghua Huang |
spellingShingle |
Zhaowen Wang Shang Wu Yuhan Huang Yulin Chen Shuguo Shi Xiaobei Cheng Ronghua Huang Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions Energies water emulsified diesel ambient temperature evaporation ignition low temperature combustion |
author_facet |
Zhaowen Wang Shang Wu Yuhan Huang Yulin Chen Shuguo Shi Xiaobei Cheng Ronghua Huang |
author_sort |
Zhaowen Wang |
title |
Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions |
title_short |
Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions |
title_full |
Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions |
title_fullStr |
Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions |
title_full_unstemmed |
Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions |
title_sort |
evaporation and ignition characteristics of water emulsified diesel under conventional and low temperature combustion conditions |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2017-07-01 |
description |
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. |
topic |
water emulsified diesel ambient temperature evaporation ignition low temperature combustion |
url |
https://www.mdpi.com/1996-1073/10/8/1109 |
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