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| Experimental Investigation into Effect of Fuel Sensitivity on Combustion and Emissions of Partially Premixed Combustion |
| DOI：10.13949/j.cnki.nrjgc.2019.01.002 |
| Key Words:toluene reference fuel partially premixed combustion fuel sensitivity octane number |
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| Abstract:An experimental investigation was conducted into the effect of fuel sensitivity on combustion and emissions of partially premixed combustion on a modified single-cylinder testing engine fueled with different fuels of the same research octane number(RON) but different sensitivities. The fuels used were toluene reference fuels of different sensitivities of 0, 2, 5, 8 and 11(with 11 the greatest), and a market gasoline with the RON of 92. The results indicate that with a fuel of higher sensitivity, the ignition delay is longer, the fuel/air mixture more homogeneous, and the premixed combustion stronger with more NOx. With the increase in fuel sensitivity, the CA50 first delays and then advances, resulting in the most delay of CA50 with the fuel having the sensitivity of 2. With a fuel of lower sensitivity, the rate of maximum pressure rise is smaller; but the rate of maximum pressure rise with the gasoline is the highest due to its stronger volatility and more premixed combustion. Moreover, with the fuel having the sensitivity of 2, the engine has the most heat release near top dead center, resulting in the highest thermal efficiency. With the gasoline and the fuels having the sensitivities of 5 and 8, engine soot is the lowest. The sensitivity of the gasoline with the RON of 92 is between 5 and 8. |
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