针对航空发动机燃烧室中存在的燃油流量脉动问题开展实验研究，设计并搭建了燃油喷嘴流量脉动激光可视化实验台，在等流量条件下利用高频激光粒子图像速度仪（High Speed Particle Image Velocimetry,PIV）分析燃油脉动频率变化对喷嘴雾化特性影响。实验结果表明：流量脉动促进了液膜表面的发展及液膜的破碎，对喷嘴的雾化产生积极的影响；喷嘴下游带状液膜区的发展和液滴的瞬态速度与喷嘴的流量脉动频率具有一致性；液滴的瞬态速度脉动幅值受脉动频率影响，在50 Hz时存在极大值。

In order to analyze the problem of fuel flow pulsation in the combustion chamber of an aeroengine,a laser visualization experimental bench for fuel flow pulsation of the nozzle was designed and built to investigate the effect of the change of fuel pulsation frequency on the atomization characteristics of the nozzle.The influence of flow pulsation frequency on the atomizing flow field of pressure atomizing nozzle was studied by using the High Speed Particle Image Velocimetry (PIV) under the condition of constant flow.The experimental results show that the flow pulsation promotes the development of the liquid film surface and the breakage of the liquid film,and has a positive effect on the atomization of the nozzle.The development of banded liquid film area downstream of the nozzle and the transient velocity of droplet are consistent with the flow pulsation frequency of the nozzle.The amplitude of the transient velocity pulsation of the droplet is affected by the pulsation frequency and has a maximum value at 50 Hz.

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