中文摘要：

通过研究背景相对湿度对滑动弧放电特性的影响，分析正丁烷的降解过程和降解机理．结果表明，增大湿度会减少等离子区域电子数量，降低放电电流强度，抑制臭氧的生成．无论是在空气还是氮气条件下，正丁烷降解率随背景相对湿度的增大而增大（分别由81．9％和33．8％增至91．2％和54．7％），提高背景相对湿度可以减少副产物中NO2的生成量．根据实验结果推测，基团诱发的反应在正丁烷的降解过程中起主要作用，在潮湿背景条件下，OH基团对正丁烷的降解起关键作用．

英文摘要：

The decomposition process and mechanism of n-butane under gliding arc discharge condition were studied by investigating the effect of background relative humidity. Experimental results showed that the addition of water vapor reduced the electron amount and discharge current intensity and suppressed the for- mation of 03. Either in air or nitrogen condition, the increase of background relative humidity enhanced the n-butane decomposition （from 81.9% and 33.8% to 91.2% and 54.7%, respectively） increasing the background relative humidity can suppress the formation of NO2. Results indicated that the process was mainly controlled by the radical induced reactions. The OH radicals were important to the n-butane decomposition in a moist atmosphere.