Performance and Emissions of a Compression Ignition Engine Fueled with Diesel/Oxygenate Blends for Various Fuel Delivery Advance Angles
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- 作者：Zuohua Huang ; Hongbing Lu ; Deming Jiang ; Ke Zeng ; Bing Liu ; Junqiang Zhang ; and Xibin Wang
- 刊名：Energy & Fuels
- 出版年：2005
- 出版时间：March 2005
- 年：2005
- 卷：19
- 期：2
- 页码：403 - 410
- 全文大小：298K
- 年卷期：v.19,no.2(March 2005)
- ISSN：1520-5029
文摘
Oxygenated blends were prepared by adding methanol and solvent to diesel fuel, and engineperformance and emissions of the oxygenated blends under various fuel delivery advance angleswere conducted in a compression ignition engine. The results showed that the engine thermalefficiency increased and the diesel-equivalent brake specific fuel consumption decreased as thefuel delivery advance angle for the oxygenated blends increased, and the behavior had a tendencyto be more obvious at high engine speed. The NOx concentration in the oxygenated blendsincreased as the fuel delivery advance angle increased. For a specific fuel delivery advance angle,the NOx concentration increased as the oxygenate mass fraction in the fuel blends increased,whereas a large addition of oxygenates in the diesel fuel reduced the NOx concentration. Theaddition of oxygenate in the diesel fuel had a strong influence on the NOx concentration at highengine load, whereas it had little influence at low engine load. The CO content decreased as thefuel delivery advance angle at high engine load became retarded, whereas at middle and lowloads, the CO concentration varied little with variation of the fuel delivery advance angle butpresented a low value for the diesel/oxygenate blends. The fuel delivery advance angle had littleinfluence on the exhaust hydrocarbon (HC) content for the diesel/oxygenate blends. The amountof smoke can be decreased remarkably by the addition of oxygenate in diesel fuel at the settingof various fuel delivery advance angles. The amount of smoke decreased as the fuel deliveryadvance angles for both diesel fuel and diesel/oxygenate blends increased; this phenomenon wouldbe due to the increase in the fraction of fuel burned in the premixed burning phase and thedecrease in the fraction of fuel burned in diffusive combustion phase, as well as the improvementof the diffusive combustion in the presence of oxygenated blends. The study also showed that aflat NOx/smoke trade-off curve existed when the oxygenated blends were used.