不同废气循环方式下正丁醇-汽油发动机燃烧排放特性动力工程专业毕业论文.docx

Regardless of stratified-EGR or manifold-EGR, the indicated thermal efficiencies of the engine run in one intake port are higher than those with two intake ports at the same EGR ratios. In the case of manifold-EGR, the magnitude of EGR ratios for the engine to operate stably with one port intake opening is close to that with two intake ports opening, but the maximum EGR ratios for the engine with bustion in the former is bigger.
Under the conditions of the engine operating with one intake port at 1500 rpm, the indicated thermal efficiencies of the engine fueled with the blend containing 30% n-butanol and 70% gasoline by volume (Bu30) are higher than those running with gasoline in stratified-EGR or manifold-EGR. Among them, the EGR ratio for the gasoline-fueled engine with bustion in manifold-EGR is the lowest while that for the engine fueled with Bu30 in stratified-EGR is the largest.
Under the conditions of the engine opening one intake port with stratified-EGR or manifold-EGR, the indicated thermal efficiencies at 2000 rpm are higher than those at 1500 rpm, but the EGR ratio for the engine with bustion at 2000 rpm is lower pared to that at 1500 rpm, and the EGR ratio for the engine with bustion decreases more with engine speed in the case of stratified-EGR. The engine with bustion in the case of stratified-EGR can tolerate much more exhaust gas and air dilution pared to that with manifold-EGR.
KEY WORDS˖EGR, gasoline, n-butanol, stratified, particle
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