Influence of bend structure on high-temperature flow after gas explosion

•Bend structure has little influence on high-temperature flow before the bend.•Bend structure has great influence on high-temperature flow after the bend.•The bigger the bend angle is, the greater the thermal loss on the bend will be.•Peak temperature after bend shows a linear attenuation with increasing bend angle.

In order to study on the influence of bend structures on high-temperature flow of gas explosion in laneways/tubes, a set of experimental facility for gas explosion in tubes with bend structures of different angles and a transient temperature and pressure test system were set up, with the help of which, the variation process of unsteady temperature field when high-temperature flow of methane–air explosion going through the bend structure was studied. The study results show that the bend structure has little influence on high-temperature flow before the bend and has relatively great influence on that after the bend. The bigger the bend angle is, the greater the thermal loss at the bend will be and then the greater the temperature attenuation of the high-temperature flow going through the bend structure will be. In addition, the attenuation of peak temperature after the bend compared with that of corresponding location in the straight tube presents a linear distribution with the bend angle. The above conclusions provide reference basis for compound hazard effect assessment of gas explosion in a complex structure as well as corresponding accident investigation and analysis.

Graphical abstractThe figure presents a long tube with 135° bend structure for gas explosion experiment. In this paper, a set of experimental facility for gas explosion in tubes with bend structures of different angles were set up in order to study on the influence of bend structures on high-temperature flow of gas explosion in laneways/tubes.Figure optionsDownload full-size imageDownload as PowerPoint slide