【摘要】 燃油微喷嘴的雾化性能影响航空发动机燃烧室的燃烧性能，微铣削加工后微喷嘴表面的加工残留和毛刺是导致雾化性能不达标的重要原因。为了研究壁面加工质量对燃油喷嘴雾化性能的影响规律并制定相应的工艺解决方案，建立了微喷嘴的加工残留模型和毛刺模型，采用计算流体动力学方法研究加工残留和毛刺对微喷嘴雾化性能的影响机理及规律。结果表明：壁面加工残留和毛刺均有利于促进液体破碎，形成的雾滴粒径更小，壁面残留导致喷雾锥角过大且均匀度差，但毛刺主要导致雾化均匀度差。为了降低燃油喷嘴内表面粗糙度，减少壁面毛刺，采用聚甲基丙烯酸甲脂（PMMA）毛刺抑制技术和微细喷砂技术进行工艺优化，结果表明：PMMA毛刺抑制技术和微细喷砂技术均可应用于喷嘴加工，分别使壁面粗糙度降低23%和30%，表面粗糙度从0.83μm分别降低到0.64μm和0.58μm。2种技术均能够显著抑制切削加工毛刺和去除切削加工残留。更多还原

【Abstract】 The atomization performance of the fuel micro-nozzle affects the combustion performance of the aeroengine. The machining residues and burrs on the inner surface of micro-nozzles after micro-milling are important reasons for the unsatisfactory atomization performance. To study the effect of processing quality on the atomization performance of the fuel nozzle and develop corresponding process solutions, the machining residue model and the burr model of the micro-nozzle were established, and the computational fluid dynamics method was used to study the mechanism and laws of the influence of machining residues and burrs on the atomization performance of the micronozzle. The results show that the machining residues and burrs are beneficial to facilitate liquid breakup, forming smaller droplets. Machining residues lead to an excessively large spray cone angle and poor atomization uniformity, but burrs mainly lead to poor atomization uniformity. The PMMA burr suppression technology and micro-sandblasting technology were adopted for process optimization to reduce the internal surface roughness and reduce burrs. The results show that both PMMA burr suppression technology and micro-sandblasting technology can be applied to nozzle processing, reducing surface roughness by 23% and 30%, and the surface roughness can be reduced from Ra 0.83 μm to Ra 0.64 μm and Ra 0.58 μm, respectively. Both techniques can significantly suppress machining burrs and remove machining residues.更多还原