A prediction model of the stability reduction performance of aqueous film forming foam based on high-low temperature alternating aging test

In this paper, high and low temperature alternating accelerated aging tests were carried out on the aqueous film-forming foam fire extinguishing agent (AFFF) at a low temperature of −40 ℃ and a high temperature of 55 ℃. A ring tensiometer and a viscometer were used to measure the surface tension and viscosity of the foam. The Dynamic Foam Analyzer (DFA100) monitored foam evolution in real time using a high-speed camera to investigate the performance changes of AFFF after aging. The results show that under the alternating aging at low temperature −40 ℃ and high temperature 55 ℃. The drainage performance, foaming capacity, and microstructural stability of various foam types were all negatively affected. In particular, the standardized foam drainage rate increased by 0.22–1.73 times, the expansion ratio decreased by 4–14 %, and the foam stability time declined by 0.79–2.8 %. A dimensionless prediction model for the stability time of AFFF after aging was established based on the key performance parameters of foam.