Correlation model of overpressure attenuation of gas explosion in pipeline and roadway

In order to establish the connection between the propagation of gas explosion overpressure in pipeline and roadway, and enable more accurate prediction of such overpressures in practical application, the derivation of corresponding attenuation model is investigated. First of all, the factors affecting the attenuation of overpressure propagation of pipeline gas explosion are analyzed by dimensional analysis, and a relevant model is derived and verified. Secondly, the similarity analysis of two sets of gas explosion test systems of pipeline and roadway is performed based on similarity theory, and the overpressure mapping factor is deduced. According to the relations between different gas mixture ratios and overpressure ratios in roadways, the volume correction factor is derived, and the correlated attenuation model between pipelines and roadways is established. Finally, the correlation model is verified. The results demonstrate that the gas explosion test of roadway and pipeline realizes the geometric, overpressure and dynamic similarity conditions. The theoretical values of the pipeline gas explosion overpressure attenuation model agree well with experimental values, and the fitting curves show consistent trends. The theoretical values of the gas explosion overpressure attenuator correlation model are consistent with the experimental values, with all relative errors controlled within ±4.5%, which can concisely and intuitively describe the propagation of gas explosion overpressure and the relations between overpressures in pipeline and roadway.