Characteristics of flame velocity of gas explosion with obstruction in pipeline

SummaryThe velocity of flame propagation caused by gas explosion is very difficult to be measured in experiment. A new image processing method is applied to calculate the velocity based on correlation coefficients of images. Experiment of gas explosion with 9.5% gas is carried out. The images photographed during the experiment are processed by the new method. And the change law of velocity of flame propagation is calculated. The results show that the velocity and structure of the flame are both unstable when it propagates in the pipeline. The propagation of flame is not away in acceleration state, but acceleration and deceleration are mutual alternation. And the velocity is in shock statement till the flame extinct during the whole flame propagation. The results also show that the metal wire mesh in the pipeline can accelerate the velocity of flame propagation but reduce the damage caused by gas explosion. And this method also covers the shortage of experimental method.