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The present work reports behaviors regarding the formation and collapse of aventilated supercavity while varying the cavitator shapes, including triangle,disk, and cone and varying mounting struts. Three cavitators with the samefrontal area are fabricated with 3D printing and mounted on a forward facingmodel (FFM). The ventilation requirements to generate (C_Qf) and sustain (C_Qc)a supercavity are tested over a wide range of Froude number (Fr) for eachcavitator and compared with backward facing model(BFM). Compared to thetriangle and disk cavitators, the cone-shaped cavitator requires the leastamount of air to generate a supercavity in nearly all of the tested flow regimeexcept very high Fr. The C_Qc of disk FFM is lower than that of its BFMcounterpart at small Fr and exceeds the BFM C_Qc with further increase of Fr.The cone cavitator has the smallest C_Qc among all the cavitators across therange of Fr in our experiments. Simultaneous internal pressure and cavitydimension measurements are conducted to elucidate the cavity sustenancebehaviors. The cone-generated cavity yields a significantly smaller maximumdiameter and a shorter half-length. Cavity geometric information and cavitypressure measurements with high-speed imaging of re-entrant jet are employed toestimate the re-entrant jet momentum under different Fr for disk and conecavitators. The estimated re-entrant jet momentum shows reasonable match withthe ventilation air momentum under C_Qc in lower Fr for both cavitator cases,with the disk cavitator case yielding significantly stronger re-entrant jet,providing support to the re-entrant jet mechanism governing on the cavitycollapse. Our study sheds some light on the cavitator design and ventilationstrategy for a supercavitating vehicle in practice.

Effect of mounting strut and cavitator shape on the ventilation demand for ventilated supercavitation