Experimental study on deflagration dynamics of premixed flame in inclined crossover pipes

ABSTRACT

The existence of branch pipelines is very common in industry. And the angles between the pipes are different. For studying the influence of inclined crossed pipe and different equivalence ratios on the flame propagation dynamics of premixed methane/air, a high-velocity camera and pressure sensor were used to record the flame propagation images and the changes of pressure inside the pipe on the basis of experiments. The results show the maximum flame propagation velocity and the maximum overpressure increased with the increase of equivalent ratios. Since the crossover pipe was set up with three outlets, the obtained results showed the maximum overpressure value in the straight pipeline was higher than that in the cross pipeline, 0.1553 bar and 0.1142 bar, respectively. Nevertheless, the maximum flame propagation velocity in cross pipe was much higher than that in straight pipe, 65.6 m/s and 25.6 m/s, respectively. The existence of branch pipe can greatly improve the flame velocity.

KEYWORDS:

• Deflagration
• overpressure dynamics
• crossover pipe
• premixed combustion
• flame structure

Acknowledgment

This work was supported by National Natural Science Foundation of China (No.51774115).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the National Natural Science Foundation of China [No. 51774115].