Effect of the pilot quantity on the ultrafine particle emissions and the combustion characteristics of a biodiesel pilot-ignited natural-gas dual-fuel engine

The combustion characteristics of a turbocharged natural gas and diesel dual-fuelled compression ignition (CI) engine are investigated. With the measured cylinder pressures of the engine operated on pure diesel and dual fuel, the ignition delay, effects of pilot diesel and engine load on combustion characteristics are analysed. Emissions of HC, CO, NOx and smoke are measured and studied too. The results show that the quantity of pilot diesel has important effects on the performance and emissions of a dual-fuel engine at low-load operating conditions. Ignition delay varies with the concentration of natural gas. Smoke is much lower for the developed dual-fuel engine under all the operating conditions.

Download Full-text

Influence of Boost Pressure on the Combustion Characteristics of a Dual Fuel Diesel Engine Ignited by Biofuels with Natural Gas

The Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines ◽

10.1299/jmsesdm.2017.9.c204 ◽

2017 ◽

Vol 2017.9 (0) ◽

pp. C204 ◽

Cited By ~ 1

Author(s):

Yasufumi Yoshimoto ◽

Eiji Kinoshita ◽

Takeshi Otaka

Keyword(s):

Diesel Engine ◽

Natural Gas ◽

Combustion Characteristics ◽

Dual Fuel ◽

Boost Pressure

Download Full-text

Effect of the diesel injection timing and the pilot quantity on the combustion characteristics and the fine-particle emissions in a micro-diesel pilot-ignited natural-gas engine

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407013480452 ◽

2013 ◽

Vol 227 (8) ◽

pp. 1142-1152 ◽

Cited By ~ 26

Author(s):

Lei Zhou ◽

Yi-Fu Liu ◽

Chen-Bo Wu ◽

Lu Sun ◽

Long Wang ◽

...

Keyword(s):

Natural Gas ◽

Fine Particle ◽

Combustion Characteristics ◽

Injection Timing ◽

Particle Emissions ◽

Gas Engine ◽

Natural Gas Engine ◽

Diesel Injection

Download Full-text

Combustion Characteristics of a Dual Fuel Diesel Engine With Natural Gas (Influence of Cetane Number of Ignition Fuel)

ASME 2011 Power Conference, Volume 1 ◽

10.1115/power2011-55362 ◽

2011 ◽

Cited By ~ 3

Author(s):

Yasufumi Yoshimoto ◽

Eiji Kinoshita

Keyword(s):

Diesel Engine ◽

Natural Gas ◽

Cetane Number ◽

Engine Performance ◽

Mean Value ◽

Combustion Characteristics ◽

Combustion Stability ◽

Dual Fuel ◽

Gas Oil ◽

Performance And Emission

This paper investigates the performance, exhaust emissions, and combustion characteristics of a dual fuel diesel engine fueled by CNG (compressed natural gas) as the main fuel. The experiments used standard ignition fuels prepared by n-hexadecane and heptamethylnonane which are used to define the ignitability of diesel combustion, and focused on the effects of fuels with better ignitability than ordinary gas oil such as fuels with higher cetane numbers, 70 and 100. Compared with gas oil ignition, a standard ignition fuel with C.N. 100 showed shorter ignition delays, and lower NOx exhaust concentrations, and engine noise. The results also showed that regardless of ignition fuel, misfiring occurred when the CNG supply was above 75%. While the CNG ratio where misfiring occurs lowered somewhat with increasing C.N., the combustion stability (defined as the standard deviation in the cycle to cycle variation of IMEP divided by the mean value of IMEP) was little influenced. In summary, the results show that the influence of the ignitability on the engine performance and emission characteristics of the dual fuel operation is relatively small when the ignition fuel has C.N., and similar to or higher than ordinary gas oil.

Download Full-text