Abstract: This paper is conducted to study the propagation law of coal dust explosion induced by gas explosion in different curved roadways. Firstly, pipelines with different bending angles were used to simulate the underground curved roadway structure. Then the coal dust explosion experimental system was used to test the shock wave pressure value and flame propagation velocity at different locations. Finally, study was carried out on the variation law of coal dust explosion shock waves in pipelines with different turning angles and that of the flame before and after the turning. The results show that with a certain gas filling length, the shock wave's peak overpressure of deposited coal dust explosion decreases at first and then increases, and it decreases sharply after reaching the corner. Its attenuation rate is augmented as the turning angle of pipelines increases, and the larger the angle is, the faster the attenuation of peak overpressure is, it is also found that the flame spreading velocity first increases and then decreases, and it increases abruptly after going through the curved pipe. Its change rate increases with the increase of the angle, and the larger the angle is, the greater the velocity increases.

Key words: gas explosion, coal dust explosion, pipe angle, peak overpressure, flame propagation