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 ?
JMS has solved the challenge of developing new technology for supercavitation and control of small waterplane area twin hull (SWATH) vessels at high speed.
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.
It uses supercavitation technology and high-performance jet engines to achieve hull friction reduction and high speed.
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.
7 million contract to support development of the Underwater Express, an undersea transport capable of controllable speeds up to 100 knots through supercavitation.
This Defense Advanced Research Projects Agency-funded effort will help determine the feasibility of supercavitation technology to enable a new class of high-speed underwater craft for future littoral missions that could involve the transport of high-value cargo and/or small units of personnel.
The program will investigate and resolve critical technological issues associated with the physics of supercavitation and will culminate in a credible demonstration at a significant scale to prove that a supercavitating underwater craft is controllable at speeds up to 100 knots.