Research on the Mixing Mechanism and Parameter Optimization of Liquid Nitrogen Foam Generator

Nitrogen foam is expected to be an effective method extinguish large-scale fires and suppress explosions. The key its foaming process that gas nitrogen (N2) a solution are mixed uniformly in generator. Moreover, liquid (LN2) has been proposed as source of generate previous experimental works. In this paper, the flow heat transfer characteristics between explored by numerical methods, which then utilized optimize parameters It found pattern generator with cone spoiler stratified establishing mixture Lee’s evaporation-condensation model ANSYS Fluent. plays crucial role breaking LN2 into droplets increasing contact area phases, distance 10 mm from inlets recommended. From results, unreasonable rate ratio may lead icing or low volume fraction nitrogen, thus 1:50 determined As for shape spoiler, spiral shows best performance compared semisphere spoilers, due fluid rotation instead translation, effectively increases N2 0.616 0.717. Therefore, mixing work lays foundation devising practical