论文部分内容阅读
中小功率高速柴油机燃料燃烧能否及时、完全,主要取决于燃油喷雾质量。燃油经高压喷油泵加压后由喷油器喷入气缸内,喷射过程中压力变化范围为100~500kgf/cm~2,喷射正时在上止点前15~35°CA,历时曲轴转角15~20°CA,其时气缸中压缩空气压力30~50kgf/cm~2,温度500~700℃,燃油喷射速度100~200m/s。喷油器的作用是将喷油泵供给的燃油雾化成细而均匀的油束,并将其分布到燃烧室中。喷入的燃油在气化后着火燃烧,燃烧过程的持续时间是非常短暂的。如曲轴转速3000r/min的发动机每一转只占1/50秒的时间,假定燃烧过程从上止点前30°CA开始
Small and medium-power high-speed diesel fuel combustion timely, complete, mainly depends on the quality of fuel spray. The fuel is injected into the cylinder by the injector after the fuel is pressurized by the high-pressure fuel injection pump. The pressure in the injection process varies from 100 to 500 kgf / cm 2, and the injection timing is 15 to 35 ° CA before top dead center, and the crank angle 15 ~ 20 ° CA, the compressed air pressure in the cylinder is 30 ~ 50kgf / cm ~ 2, the temperature is 500 ~ 700 ℃, and the fuel injection speed is 100 ~ 200m / s. The function of the fuel injector is to atomize the fuel supplied by the fuel injection pump into a fine and even oil bundle and distribute it into the combustion chamber. The injected fuel is ignited and burned after gasification, and the duration of the combustion process is very short. If the crankshaft speed of 3000r / min engine revolution every 1/50 seconds, assuming that the combustion process from the top dead center before 30 ° CA