Experimental study on premixed flammable gas explosion venting in linked vessels under the same effictive vent area

Explosion venting was carried out in both linked and single vessels under the same dimensionless effective vent area conditions to study flame propagation and explosion pressure evolution. It is shown that the maximum reduced explosion pressure and the maximum pressure rise rate in the linked vessels exceed those in the single vessels, especially, the difference of the maximum pressure rise rates is much greater between the linked vessels and the single vessels. At the same dimensionless effective vent area, the maximum reduced explosion pressure in the receiving vessel of the linked vessels, is higher than that in the releasing vessel. When the receiving vessel is smaller than the releasing vessel, the maximum reduced explosion pressure in the receiving vessel is much higher. With the increase of the pipe length, the maximum reduced explosion pressure in the receiving vessel increases, and the maximum reduced explosion pressure in the releasing vessel changes unconspicuously. During the explosion venting in the linked vessels, the flame propagates acceleratively in the pipe. And at the same pipe lengths, the flame propagation speed from a small vessel to a big vessel is higher than that from a big vessel to a small vessel.