Abstract: In this paper, 20 groups of stable detonation flame arrest tests were carried out in accordance with the international standard ISO 16852:2016, 10 groups had no accelerated rings and 10 groups had accelerated rings. The results show that it is easier to form stable detonation when the accelerated ring is used as the flame accelerator, and the average flame velocity and pressure are relatively stable, and the repeatability is higher in a certain range. In stable detonation tests of in-line flame arresters, it is recommended to use the accelerated ring as the flame accelerator.

Key words: fire protection; flame arrester; accelerated ring; stable detonation