电场作用下扩散小火焰实验分析

用无水乙醇作燃料，采用内径为1．0mm的陶瓷管作燃烧器，采取拍摄图像的方法，对自由空间中直流电压下的负针-板电极和负板-板电极（负极接在火焰上方）作用下的小火焰的特性进行了实验研究。实验中发现：在两种电极作用下，随着电压的升高，火焰先被拉伸，后被压缩；火焰形状由半椭圆形变为半圆形，针极电场下火焰又由圆形变为帽子形；在电压增大到一定值时，会出现离子风；与负板-板电极所不同的是，负针-板电极作用下当电压增大到一定值时，离子风非常强烈，火焰脉动厉害。

Study of small jet diffusion flame in electric field

The ethanol was fuel,and the ceramic tube of 1.0mm diameter was the burner.The small flame characteristics have been studied by taking images in DC of negative pin- plate electrode and negative plate-plate electrode (negative electrode in the top of the flame).Experiments found that,with the voltage increased,the flame was first stretched,then compressed under the two electrodes.The shape of the flame was half ellipse,then semi-circle,sugarloaf under electric field of a needle;When voltage increased to a ce...