流体物性对高压共轨系统喷射过程的影响研究（英文）

Impact of fluid properties on the injection process in a common-rail direct injection system

测量了二甲醚和柴油的喷射率和油管压力,研究了流体物性对高压共轨喷油过程的影响。研究结果表明:由于二甲醚的可压缩性比柴油大,导致其喷油始点、喷油终点均比柴油晚。两种燃料的最大喷油速率接近。与柴油相比,二甲醚的循环喷油量较大,循环喷油能量较小。油管压力波动幅值较小,但波动持续期较长。

In this paper,the injection rates and fuel line pressure of DME and diesel are measured. The effects of fluid properties on the injection characteristics in a common rail injection system are investigated. The results show that the injection timing of DME begins and ends later than that of diesel due to larger compressibility. The peak injection rates of DME and diesel are similar. The injection quantity of DME is larger than that of diesel,while its injection energy is lower. Compared to diesel,the fluctuation amplitude of DME during injection is smaller,and the duration is longer.