Recent investigations suggested that the primary influence of an electric field on a flame is flow modification caused by ionic wind, and that negative ions produced by the electron impact attachment should play a key role in the bi-directional ionic wind. In order to prove this hypothesis in electric fields parallel to the propagating flames, we designed a coflow experiment with laminar lifted flames in vertical electric fields produced by a nozzle and ground electrode installed over the flame. We found that applying DC and AC increased the flame displacement speed, and decreased the unburned velocity even to negative velocity. Velocity measurements revealed the influence of the electric body force on the flow volume, indicating the importance of the electron impact attachment when the nozzle was charged with positive voltage. The flame propagation speeds were estimated by subtracting the unburned velocity from the displacement speed, and were well correlated with those of stationary lifted flames without an applied electric field as a function of flame curvature. This supported our hypothesis that the effect of the electric field is reflected in the flow modification, and that the flame is affected by the modified flow. It also suggested that the propagation direction of premixed or nonpremixed edge flames can be manipulated by coupling the appropriate electric fields.

最近的研究表明，电场对火焰的主要影响是离子风引起的流动变化，而电子碰撞附件产生的负离子应在双向离子风中起关键作用。为了证明平行于正在传播的火焰的电场中的这一假设，我们设计了一个同流实验，其中在垂直电场中使用层流举起的火焰，该垂直电场由喷嘴和安装在火焰上方的接地电极产生。我们发现，施加DC和AC可以提高火焰的位移速度，甚至可以降低未燃烧速度，甚至降低到负速度。速度测量揭示了电场力对流量的影响，表明当喷嘴被充以正电压时电子撞击附件的重要性。这火焰的传播速度是通过从位移速度中减去未燃烧的速度来估算的，并且与没有施加电场的固定抬升火焰的传播速度有很好的相关性，该函数是火焰曲率的函数。这支持了我们的假设，即电场的影响会反映在流量变化中，而火焰会受到流量变化的影响。还建议可以通过耦合适当的电场来控制预混合或非预混合边缘火焰的传播方向。