Experimental analysis of overpressure characteristics of gasoline–air mixture explosion in multi-branch tubes

Abstract

Taking the multi-branch structure pipelines common in the field of energy and chemical industry as the research object, the combined experimental pipeline was used to control the constant total length of the pipeline, and the experimental analysis was carried out on the characteristics of oil and gas explosion overpressure under different distribution forms, distribution locations, length and number of branch tubes. The results showed that: Compared with straight pipelines, multi-branch pipelines have great influence on the peak value and rise rate of overpressure. Under the relative arrangement, the maximum overpressure and the maximum overpressure rise rate are less than those of the one-line arrangement and staggered arrangement, and the time to reach the maximum overpressure and the maximum overpressure rise rate is also delayed. The relationship of the maximum explosion overpressure rising rate at different branches of the tube is as follows: far from the ignition end > near the ignition end > evenly distributed along the main tube. With the increase of branch pipe length, both the peak value of overpressure and the rise rate of the maximum overpressure show a trend of decreasing first and then increasing. When the branch length is 1.5 m, the peak value of overpressure and the rise rate are smaller than the straight pipe condition. The increase in the number of branches does not lead to a continuous increase in the peak and maximum rate of overpressure rise. When the number of branches is less than 3, the peak value and the rate of rise of the maximum overpressure increase with the increase of the number of branches, while when the number of branches is more than 3, both the peak value and the rate of rise of the maximum overpressure decrease.