电极间隙对离子电流的影响研究

采用不同间隙的电极测量定容燃烧弹中当量空燃比的天然气—空气混合气燃烧产生的离子电流,通过高速摄影仪拍摄火焰纹影照片,同时记录下燃烧室压力,对比燃烧室压力、火焰照片与离子电流发现,设计的测量电极可以检测离子电流,测量电极间隙的大小不影响离子电流曲线的形态,但随着电极间隙的增大,离子电流幅值减小,电流出现时间推后。

The Influence Research of Electrode Gap on Ionic Current

The ionic current generated from the combustion of CNG(compressed natural gas),which was air mixture,was measured by electrodes in a constant volume combustion bomb,the recorded pressure of chamber and the schlieren pictures taken by a high-speed camera were compared with the corresponding ionic currents.Results showed that the ion electrode designed for the measurement could detect the ionic current successfully.The electrode gap had no effect on the shape of the ionization current curve.But the ionic current value became small and the time that the current appears was delayed as the gap became large.