Aiming at the complicated vortex problem that affects the flow stability of diesel engine nozzles, this paper focuses on the effect of ventilation on the string cavitation patterns in the nozzle hole with a self-built scale-up test bench. Hole-to-hole string cavitation is not stable without bubbles, and the ventilation can improve the situation. Relatively speaking, the position of hole-to-hole string cavitation in the SAC volume changes significantly with the bubble content. In contrast, the needle-originated string cavitation is stable in the vortex channel. Only if there are many bubbles, the cavitation pattern changes to hole-to-hole string cavitation or string cavitation originating from the upper wall of the hole inlet. At this point, the corresponding atomization morphology changes, and the spray angle decreases significantly. It is verified that there is a one-to-one correspondence between the cavitating pattern and the spray angle near the hole.

针对影响柴油机喷管流动稳定性的复杂涡流问题，利用自建的放大试验台，重点研究了通风对喷管管柱空化模式的影响。孔对孔串空化在没有气泡的情况下不稳定，通风可以改善这种情况。相对而言，SAC 体积中孔对孔串空化的位置随气泡含量的变化而显着变化。相反，针起源的弦空化在涡流通道中是稳定的。只有当气泡较多时，空化模式才会变为孔间串空化或源自孔入口上壁的串空化。此时，相应的雾化形态发生变化，喷雾角度明显减小。