Abstract: In order to meet the requirements of advanced aero-engine combustor for fuel atomization quality，a dual pre-filmed Hartmann whistle ultrasonic nozzle was designed. The characteristics of fuel flow and atomization were studied experimentally using a laser particle size analyzer and a high-speed camera. The results show that the droplet size is uniform with a narrow distribution of its Sauter mean diameter （SMD） variation from 4.2μm to 9μm，and the air-liquid ratio （ALR） of the nozzle is low and varies from 0.27 to 0.54 under the precondition to meet the nozzle mass flow rate. Within the test operating conditions，SMD is basically not affected by the distance from measurement location to nozzle outlet，while it is affected mainly by fuel pressure and the distance from resonator to nozzle outlet. The atomization angle varies from 135° to 180° and it changes little with fuel pressure，while it is affected mainly by the distance from resonator to nozzle outlet.

Key words: Ultrasonic nozzle;Mass flow characteristics;Sauter mean diameter;Air-liquid ratio;Atomization angle

摘要： 为了满足先进航空发动机燃烧系统对燃油雾化质量的要求，设计了一种双预膜式Hartmann哨超声波喷嘴，采用激光粒度分析仪和高速相机对其进行了实验研究，得到了其流量特性和雾化特性。研究结果表明：在满足流量要求下，索太尔平均直径SMD为4.2μm～9μm，气液比ALR为0.27～0.54，液滴尺寸分布集中，均匀性好；在测量范围内，SMD基本不受测量位置到喷嘴出口距离的影响；油压和共振腔到喷嘴出口距离是影响SMD大小的主要因素；雾化角度随油压的变化较小；共振腔到喷嘴出口距离是影响雾化角度的主要因素，雾化角度为135°～180°。

关键词: 超声波喷嘴;流量特性;索太尔平均直径;气液比;雾化角度