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

Yao Fu, Liyan Feng, Hua Tian, Wuqiang Long, Dongsheng Dong and Xianyin Leng
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Yao Fu: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Liyan Feng: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Hua Tian: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Wuqiang Long: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Dongsheng Dong: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
Xianyin Leng: Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China

Energies, 2018, vol. 11, issue 9, 1-16

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.

Keywords: diesel engine; double-layer diverging combustion chamber; fuel spray; visualization test (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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