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96 Alexandru Radu et al. Fig. 3 – Brake specific fuel consumption vs. indicated mean effective pressure. The tests have shown an important decrease in emissions of CO and HC for operation with E20 gasoline-ethanol blend (Fig. 4 and Fig. 5). This is mainly due to better combustion properties. The level of these emissions increases at the enrichment of the dosage for both fuels and engines admission type (normal intake and supercharged). Fig. 4 – Comparison of specific HC emission for gasoline and E20. The NOx emissions presents a significant increase for E20 fuelled engine mainly due to higher combustion temperature. It can be seen that NOx emission level is higher for the supercharged engine model at the excesses air-fuel ratio value and decreases at poorer dosages.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 97 Fig. 5 – Comparison of specific CO emission for gasoline and E20. Fig. 6 – Comparison of specific NOx emission for gasoline and E20. 4. Conclusions 1. Results have shown that the model developed in AVL BOOST has successfully predicted the trends of engine performance, fuel consumption and various exhaust emissions for gasoline and E20 fuels. 2. An improved engine performance was obtained at fuelling with ethanol-gasoline blend due to the ethanol properties which allowed engine operation at leaner dosages than in the case of engine working with gasoline. 3. The use of ethanol-gasoline blends leads to an important decrease of HC and CO emissions while NOx emissions level increased but at use of the leaner dosages (λ>1.17) the NOx emissions level is smaller than standard engine.
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BULETINUL INSTITUTULUI POLITEHNIC D
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VICTOR COTOROS şi EMIL BUDESCU, As
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ALEXANDRU RADU, CONSTANTIN PANĂ an
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