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Energies 2016, 9(11), 949; doi:10.3390/en9110949

Experimental Investigation on Wall Film Distribution of Dimethyl Ether/Diesel Blended Fuels Formed during Spray Wall Impingement

1
State Key Laboratory of Engines, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China
2
School of Aerospace Mechanical and Manufacturing Engineering, The Royal Melbourne Institute of Technology University, 124 La Trobe Street, Melbourne, VIC 3000, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Evangelos G. Giakoumis
Received: 5 October 2016 / Revised: 4 November 2016 / Accepted: 8 November 2016 / Published: 16 November 2016
(This article belongs to the Special Issue Automotive Engines Emissions and Control)
View Full-Text   |   Download PDF [4557 KB, uploaded 16 November 2016]   |  

Abstract

Dimethyl ether (DME)/diesel blended fuels are used to improve the emissions caused by spray wall impingement during the early injection period. However, experimental results have showed that the spray wall impingement still cannot be avoided due to the engine structure and low density of the in-cylinder charge at the early injection timing. Furthermore, the wall film formed in the spray wall impingement process directly affects fuel/air mixture formation, combustion, exhaust emissions and oil quality subsequently. In this paper, the wall film distribution of DME/diesel blended fuels formed during the spray wall impingement process has been experimentally investigated. The variations of wall film distribution, wall film area and average thickness with different injection pressures, impingement distances, impingement angles and blending ratios have been discussed under both dry wall and wet wall conditions. Results showed that the wall film distribution styles were mainly determined by the spray impingement momentum. The variation of the wall film area and average thickness were affected by three factors including the impingement momentum, wall film mass and fuel properties. Correlation analysis was introduced in order to evaluate the effect of each impact factor on the variation of wall film area and average thickness. View Full-Text
Keywords: dimethyl ether (DME)/diesel blended fuels; spray wall impingement; wall film characteristics; lubricating oil film; early injection dimethyl ether (DME)/diesel blended fuels; spray wall impingement; wall film characteristics; lubricating oil film; early injection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, H.; Liang, X.; Shu, G.; Wang, X.; Wang, Y.; Zhang, H. Experimental Investigation on Wall Film Distribution of Dimethyl Ether/Diesel Blended Fuels Formed during Spray Wall Impingement. Energies 2016, 9, 949.

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