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甲醇已被公认为最有希望的柴油机代用燃料.其中涉及到的主要问题之一是它的自燃能力极差.本文给出了在连续压胀单次喷射燃烧装置上试验得到的甲醇喷雾的滞燃期及燃烧过程特征.试验包括喷射提前角、进气压力及气缸盖加热温度这三个因素对滞燃期及燃烧过程的影响.结果表明:喷射正时过早或过迟均会导致甲醇喷雾不着火;甲醇的滞燃期与气缸内的压力无关;燃烧室壁温度至少应达到260℃时,甲醇才能自燃.进一步的工作过程数值模拟分析表明:在本试验装置各热表面状态下可获得适合于现有柴油机所许可的滞燃期和压力增长率,而这种状态可借助于柴油机燃烧室的绝热手段而实现.
Methanol has been recognized as one of the most promising alternative fuels for diesel engines, and one of the major problems involved is its very poor self-ignition ability.This paper presents the hysteresis of methanol spray tested on a continuous injection single-injection combustor Combustion period and combustion process.The experiment includes the effects of injection advance angle, intake pressure and cylinder head heating temperature on the ignition delay and combustion process.The results show that: the injection timing is too early or too late will lead to methanol The flame of methanol is not related to the pressure in cylinder, the temperature of combustion chamber should be at least 260 ℃, methanol can spontaneous combustion.Moreover, the numerical simulation of working process shows that: Obtain a suitable retardation and pressure growth rate for the existing diesel engines, which state can be achieved by means of adiabatic means of the combustion chamber of the diesel engine.