The impact-based formation of the high speed liquid projectiles (impulsive jets) is investigated numerically. The jet formation is determined by both waves generated in the liquid in the course of impact as well as the conversion of the projectile in the nozzle and barrel. Comparative contribution of each factor is important for design of the facilities for formation of the impulsive as well as continuous jets. In order to evaluate the effect of the wave formation on the fluid acceleration the relationship between the jet velocity and fluid compressibility was estimated. Two numerical techniques were used for their estimation. The first one involved determination of the jet velocity for expulsion of the incompressible liquid. The second one involved application of the existing model for estimation of the exit velocity at various values of the liquid compressibility. The results of the computations enabled us to evaluate the effect of the various factors, particularly fluid compressibility, on the process results.
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