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Energies 2018, 11(9), 2343; https://doi.org/10.3390/en11092343

Visualization Investigation of the Influence of Chamber Profile and Injection Parameters on Fuel Spray Spreading in a Double-Layer Diverging Combustion Chamber for a DI Diesel Engine

1
School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
2
Graduate School of Engineering, Chiba University, Chiba 2638522, Japan
3
Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
*
Author to whom correspondence should be addressed.
Received: 7 August 2018 / Revised: 26 August 2018 / Accepted: 3 September 2018 / Published: 5 September 2018
(This article belongs to the Special Issue Internal Combustion Engines)
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Abstract

The double-layer diverging combustion chamber (DLDC chamber) aims to improve the fuel–air mixing formation and promote in-cylinder air utilization by changing fuel spray spreading characteristics. In order to investigate how the DLDC chamber profile and injection parameters affect the fuel spray spreading, visualization of fuel injection and impingement tests were carried out on two different DLDC chambers with different fuel injection parameters. The visualization test results showed that double-layer fuel spray spreading was obtained in the two DLDC chambers and the peripheral top clearance of each chamber was utilized efficiently. The DLDC chamber with a 50% upper layer volume provided a larger fuel spray distribution region after the start of injection. The DLDC chamber with a 70% upper layer volume obtained a larger fuel spray distribution region with better top clearance utilization at the later stage of injection. The injection parameters mentioned in this research showed significant effects on the fuel spray spreading in the DLDC chamber. Increasing the injection pressure provided a larger fuel spray distribution area at the beginning of injection. Decreasing the nozzle hole diameter had a positive influence on obtaining a larger fuel spray distribution. Advancing the injection timing enabled the enlarging of the fuel distribution region. View Full-Text
Keywords: diesel engine; double-layer diverging combustion chamber; fuel spray; visualization test diesel engine; double-layer diverging combustion chamber; fuel spray; visualization test
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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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Fu, Y.; Feng, L.; Tian, H.; Long, W.; Dong, D.; Leng, X. Visualization Investigation of the Influence of Chamber Profile and Injection Parameters on Fuel Spray Spreading in a Double-Layer Diverging Combustion Chamber for a DI Diesel Engine. Energies 2018, 11, 2343.

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