余热气化甲醇燃料对内燃机性能的影响

提出了采用内燃机废气余热气化甲醇,并将该方案同时应用在自然吸气和增压发动机上.通过将这两种方案与原汽油机进行对比,预测这两种方案对发动机动力性和经济性的改善潜力.结果表明:甲醇蒸汽发动机在外特性下功率较原汽油机最大下降了7.1%,热效率最大提高了3.0个百分点;增压后,动力性和经济性较原汽油机和甲醇蒸汽发动机都有较大提高,当增压压力为0.15MPa时热效率较原汽油机最大可提高4.0个百分点,表明余热气化甲醇在内燃机上具有较好的节能潜力.

Effects of Waste Heat Evaporating Methanol Fuel on Internal Combustion Engine Performances

A new method for the use of methanol in IC engine was proposed. Methanol was evaporated into vapor by IC engine exhaust heat and used as gas fuel. This concept was applied to both naturally aspirated engine and turbocharged engine. By comparing the two schemes with the original gasoline engine, the improvement potentials of power performances and fuel economy of new concepts can be predicted.The results have shown that, when naturally aspirated engine is fueled with methanol vapor, power has a slight decline with the maximum of 7.1%, and thermal efficiency has a slight increase with the maximum of 3.0 percentage points; when turbocharged engine is fueled with methanol vapor, the power performance and fuel economy have a great improvement over both the original gasoline engine and methanol vapor engine. At the boost pressure of 1.5 bar, the maximum improvement of thermal efficiency comes up to 4.0 percentage points. All these can prove that it is a useful concept for IC engine energy conservation.