supercavitation


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supercavitation

[‚sü·pər‚kav·ə′ā·shən]
(fluid mechanics)
An extreme form of cavitation in which a single bubble of gas forms around an object moving rapidly through water, enveloping it almost completely so that the water wets very little of the object's surface, thereby drastically reducing viscous drag.
References in periodicals archive ?
Limited Tenders are invited for Job contract for technical services for realization of supercavitation projectiles,test facilities
In this work, partial cavitation has been simulated using BEM over several cylindrical bodies with different cavitator shapes: hemispherical, blunt cylindrical, and conical nose shapes (with half-cone angle of 40 degrees) and supercavitation has been modeled over a disk cavitator.
The torpedo controls its direction using four fins that skim the inner surface of the supercavitation envelope.
One of the newest methods which help to reduce the drag force and to increase velocity of body without increasing energy consumption is so called supercavitation [6].
Dovell thinks fin and foils can be designed to create supercavitation.
Shang, "Numerical investigations of supercavitation around blunt bodies of submarine shape," Applied Mathematical Modelling, vol.
Supercavitation was first considered as a means to increase the underwater range of shells fired to strike ships below their waterlines.
The Henschel Hs293/294 anti-ship guided missile (also of WW II), using an SC500 warhead with Kopfring (a device fitted to German and Russian bombs to limit penetration in soil), may have achieved supercavitation on entering the water at 150 to 180 metres/sec.
Western hydrodynamic research then concentrated on reducing propeller blade drag by supercavitation, while the Soviets also used it to reduce the drag on non-rotating bodies.
The dimensions of the supercavitation bubble vary with ambient pressure, as does the force on the projectile nose, hence effective range reduces as depth increases.
To digress, supercavitation has also been applied to improve the penetration and stability of bullets used in big game hunting, as illustrated by the products of Michael Reichenberg Spezialgeschosse in Germany and GS Custom in South Africa.