Flow analysis on fluidic element of complete fluidic sprinkler

The fluidic element of complete fluidic sprinkler has great influence on the work performance of sprinkler, and the size design is affected by the liquid-gas two-phase inner flow. Two and three dimensional wall attaching offset jets had been numerically simulated by using the volume of fluid (VOF) model, and the wall pressure distribution, velocity decay on the jet centerline, nondimensional reattachment length and liquid-gas two-phase interface position were obtained. For the wall static pressure, the numerical results were consistent with the experimental data. Under the same inlet velocity, the maximal point of wall pressure decreased and the wall attachment point moved down with the increasing of the offset ratio. For the wall attaching jet with small offset ratio, an empirical relationship between the nondimensional reattachment length and offset ratio was summarized. The simulation results are of useful in guiding the fluidic element size design.