内部加热GDI喷油器综合性能研究

An Investigation into the Comprehensive Performances of Inner Heated GDI Injector

为充分利用温升对GDI喷油器综合性能的有利影响,开发出一种新型内部加热GDI喷油器。把电磁转化过程中的能量损耗作为热源,充分考虑流体和空气的热传导效应,用ANSYS软件对GDI喷油器温度场进行仿真分析,并利用红外热像仪对GDI喷油器温度场的分布进行了试验研究。结果表明,GDI喷油器本体温升受驱动信号的影响较大,且温度越高,喷油器动态响应速度越慢,燃油喷射量越少,且温度升高会造成喷雾形态出现明显的变化。

In order to take full advantage of the temperature rising effect on the performances of GDI injec-tor, a novel inner heated GDI injector is developed. With the energy dissipated as heat source and fully considering the heat conduction effect of fluid and air,both simulation on the temperature field of GDI injector with ANSYS and experimental study on the distribution of GDI injector temperature field with thermal infrared imager are conducted. The results show that driving signal has relatively great effects on the temperature rise of GDI injector body, and the higher the temperature,the slower the dynamic response of GDI injector,the less the amount of fuel injection. In addition,the temperature rise of injector body may also cause the apparent change of spray pattern.