通过在流动聚焦的同轴液-气射流区域施加电场，开展了电场力和气动力共同作用下锥形以及带电射流的不稳定性特性实验研究．实验在精密设计的流动聚焦装置上完成，分析了外部电压、气体压力降和液体流量等主要控制参数对流动聚焦过程的影响，获得了锥形的振动模式和稳定模式及其之间的转换，得到了射流的滴模式、轴对称模式、共存模式和非轴对称模式及其转换并定量分析了电场对射流尺寸参数的影响．结果表明，相比于单一的流动聚焦，该方法能够增强锥形的稳定性，促进液体射流雾化，减小颗粒的直径，因此在科技领域和工程实际中具有重要的应用价值．%The instability characteristics of the cone and the electrified jet coupling the electric and pneumatic forces have been investigated experimentally by applying an electric field in the region of the coaxial liquid-gas jet of flow focusing. The experiments were carried out on a well-designed flow focusing device. The effects of the mainly controllable parameters including the external electric voltage, the gas pressure drop and the liquid flow rate on the flow focusing process were analyzed. The flow modes of the cone, including the cone-shaky mode, the cone-steady mode and the transition between them, were obtained. The shapes and transitions of the jet flow modes including the dripping mode, the axisymmetric mode, the coexisting mode and the non- axisymmetric mode were also observed, and the effects of the electric field on the jet dimensions were further performed quantitatively. The results indicate that this combining method is capable of stabilizing the cone, enhancing the atomization and reducing the size of the production compared with the single flow focusing. As a result, the method has remarkable applications in fields of science and technology, and would be valuable in engineering practice.
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