Vortex Rings from Underwater Explosions
URS SYSTEMS CORP BURLINGAME CA
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Vortex rings were produced explosively in water with enough intensity to cavitate their cores. Such cavitation limits the velocity which can be imparted to vortex rings at shallow depths. Vortex rings were produced by explosions in short cups or gun tubes, rather than in the customary cylindrical containers with orifice plates. One advantage of the cups is that relatively large rings are formed outside the cup lips. The following conclusions were drawn from the measured data. The impulse applied to a flat plate by an adjacent underwater explosion can be increased five times by enclosing the charge in a short cylindrical cup whose length and radius are about 25 times larger than the radius of an equivalent TNT sphere. Thin-walled cups which subsequently collapsed were nearly as effective as thick cups for generating single vortex rings.
- Fluid Mechanics