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用熏蒸法将乙醇蒸汽送入一台直喷式增压发动机,酒精与柴油的百分比在低负荷时为80％,在高负荷时为50％。经过模数转换的气缸压力数据在微计算机进行处理,以确定发对机的着火滞燃期。对数据分析的结果表明,酒精熏蒸的热力学效果使滞燃期变长,而其化学效果则取决于在滞燃期前酒精的反应程度。如果喷油前气缸温度高于一定的值,例如大约900K,那么酒精的熏蒸也可能使滞燃期反而缩短。
Ethanol steam was fumigated into a direct-injection supercharged engine. The percentage of alcohol to diesel was 80% at low loads and 50% at high loads. After the analog-to-digital conversion of the cylinder pressure data processing in the microcomputer to determine the ignition on the ignition delay. The results of the data analysis show that the thermodynamic effect of alcohol fumigation makes the ignition delay longer, and its chemical effect depends on the degree of alcohol reaction before the ignition delay. If the pre-fueling cylinder temperature is higher than a certain value, for example about 900K, alcohol fumigation may also shorten the ignition delay.