In this paper, the near-field injection characteristics of fuel injection nozzles are studied based on the roughness of the hole wall. Using FLUENT’s VOF multiphase flow model and realizable k-e turbulence mode to simulate the process of fuel injection from the nozzle under different hole wall roughness. Based on the two parameters of penetration distance and atomization cone angle, the results of fuel injection under different hole wall roughness are analyzed, and the fuel injection verification experiment is carried out through the injection nozzle hole processed by picosecond laser. The results show that the simulation results are consistent with the actual results, and the influence of roughness on the penetration distance and the atomization cone angle is verified. The specific effect is that the increase of the wall surface roughness of the injection hole will lead to the decrease of the penetration distance of the fuel injection and the increase of the atomization cone angle.

本文基于孔壁的粗糙度研究了燃油喷嘴的近场喷射特性。使用FLUENT的VOF多相流模型和可实现的ke湍流模式来模拟在不同孔壁粗糙度下从喷嘴喷射燃料的过程。基于穿透距离和雾化锥角这两个参数，分析了在不同孔壁粗糙度下的燃油喷射结果，并通过皮秒激光加工的喷嘴孔进行了燃油喷射验证实验。结果表明，仿真结果与实际结果吻合，验证了粗糙度对熔深和雾化锥角的影响。