A new atomization method to destabilize an annular liquid sheet ejected from a gas turbine engine injector, called the Rayleigh-Taylor instability induced atomization (RTA) is proposed. In contrast to the traditional coaxial atomizers, a liquid is allowed to flow through an annular passage in the axial direction and air is allowed to impinge on the liquid sheet in the radial direction. Due to this interaction, the liquid sheet exhibits a radial acceleration that induces the azimuthal instability and forms a ligament via azimuthal modes. Experimentally, we investigated the atomizer performance using a high-speed imaging technique by varying the Bond number. Here, Bond number ($Bo$) is defined by the competition between the radial acceleration force and the surface tension force. We observed that the number of ligaments ($N$) formed from the liquid sheet is a strong function of $Bo$ and found that $N\sim \sqrt{Bo}$. The experimental results agree well with the theoretical model and the proposed scaling is valid in the limit of Weber number $\le$ 3.14. Here, Weber number represents the ratio of inertial force in axial direction to the surface tension force. RTA achieves a novel method of ligament formation and it can create a new avenue for the distinct classes of atomizers.

提出了一种新的雾化方法，用于破坏从燃气涡轮发动机喷油器喷出的环形液层的稳定性，称为瑞利-泰勒不稳定性诱导雾化 (RTA)。与传统的同轴雾化器相比，允许液体沿轴向流过环形通道，允许空气沿径向撞击液片。由于这种相互作用，液体层表现出径向加速度，导致方位角不稳定性并通过方位角模式形成韧带。在实验上，我们通过改变邦德数使用高速成像技术研究了雾化器的性能。这里，债券号（$乙○$) 由径向加速力和表面张力之间的竞争定义。我们观察到韧带的数量（$N$) 由液体片形成的强大功能 $乙○$ 并发现 $N～\sqrt{乙○}$. 实验结果与理论模型吻合较好，所提出的标度在韦伯数极限下是有效的$\le$3.14. 此处，韦伯数表示轴向惯性力与表面张力之比。RTA 实现了一种新的韧带形成方法，它可以为不同类别的雾化器开辟一条新途径。