基于激波管的油气爆炸实验和数据分析

Explosion experiment and data analysis of gasoline-air mixture based on shock tube

通过对封闭激波管的油气爆炸实验,发现了爆炸时存在"呼吸"现象和震荡现象。通过对爆炸时的压力时间序列分析,除了得到了不同位置压力数量变化特征外,还得到了"呼吸"现象与油气的CH浓度和生成的二氧化碳浓度有关;在不同的CH浓度下,存在三种典型的压力变化曲线;震荡现象与CH浓度有关,没有固定的震荡周期,而且在不同压力变化阶段存在不同的震荡情况等结论。

The ＂breathing＂ phenomena and turbulence phenomena were found through the gasoline-air explosion experiments in closed shock tube. By the analysis on the pressure time series which were tested by pressure sen- sors, the pressure digital characteristics in different position of shock tube were obtained. Besides, it was found that the ＂breathing＂ phenomenon are connected with the CH concentrations and the carbon dioxide concentration, and there are three kinds of typical pressure curves in gasoline-air explosion experiments, and the turbulence phenomena is connected with the CH concentrations, there is no fixed oscillation cycle and the turbulences are different in different stages of pressure change.