Computational investigation was conducted to understand the effects of various parameters on nozzle flow and cavitation in a diesel fuel injector for a diesel engine. The effects of injector parameters were simulated for different conditions including the injection pressure, the outlet pressure, the position of the needle lift, and the length of the nozzle. Results show that some parameters have obvious influence on cavitation associated with nozzle flow. When the outlet pressure was constant, the velocity through the nozzle increased with the injection pressure, resulting in the cavitation at the injection pressure over 120 MPa. When the injection pressure was constant, the velocity inside nozzle decreased with the outlet pressure. As the needle tip moved closer to the bottom of minisac, the velocity inside nozzle decreased and the cavitation did not take place. The length of the nozzle hole had little effect on the velocity at inlet, but it affected the velocity distribution at outlet.

进行了计算研究，以了解各种参数对柴油机柴油燃料喷射器中喷嘴流量和气穴现象的影响。针对不同条件模拟了喷射器参数的影响，包括喷射压力，出口压力，针提升位置和喷嘴长度。结果表明，某些参数对与喷嘴流相关的气蚀有明显的影响。当出口压力恒定时，通过喷嘴的速度随注入压力而增加，导致注入压力超过120 MPa时发生气穴现象。当注射压力恒定时，喷嘴内的速度随出口压力而降低。当针尖移近小囊底部时，喷嘴内部的速度降低，并且没有发生气穴现象。喷嘴孔的长度对入口处的速度影响不大，但会影响出口处的速度分布。