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86 Victor Pantilie et al. Another influence factor is the excess air-fuel ratio. On gasoline BSFC decreases when λ increased from 0.8 to 0.9. On hydrogen BSFC decreases when the excess air-fuel ratio increased from 1 to 1.5 and when the dosage is leaner the BSFC has a slight increase (Fig. 3). Fig. 3 – Brake specific fuel consumption diagram. The NOx emissions level on gasoline increases with the increasing excess air-fuel ratio from 0.8 to 0.9, but decreases when the engine is supercharged due to the timing adjustment which decreased to avoid detonation (Fig. 4). Fig. 4 – Gasoline NOx emissions diagram. When hydrogen was used the NOx emissions level had a different behaviour (Fig. 5). When normal intake was used the maximum was reached at λ=1.3 with more than 5000 ppm. When the engine was supercharged with 1.3 bar supercharge pressure the maximum emissions level was reached at λ=1.4 and when the engine was
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 87 supercharged with 1.5 bar supercharge pressure the maximum emissions level was reached at λ=1.5. From this point the emissions level dropped significantly and as the dosage was leaner the emissions levels were very low. Fig. 5 – Hydrogen NOx emissions diagram. Fig. 6 – NOx emissions vs. power and excess air-fuel ratio diagram. The hydrocarbons levels are significantly reduced and there are no carbon monoxide emissions when using hydrogen as a fuel.
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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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30 Daniel Dragomir-Stanciu and Mari
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