Cavitation tunnel of the Versuchsanstalt für Wasserbau und Schiffbau in Berlin

Definition

A water tunnel is an experimental facility used for testing the hydrodynamic behavior of submerged bodies in flowing water. It is very similar to a similar to a recirculating wind tunnel but with water as the working fluid, and related phenomena are investigated, such as measuring the forces on scale models of submarines or lift and drag on hydrofoils. Additionally, many water tunnels are sealed and can reduce the internal static pressure, to perform cavitation studies. These are referred to as cavitation tunnels. Hydrodynamics is fluid dynamics applied to liquids, such as water, alcohol, oil, and blood. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... USS Los Angeles A submarine is a specialized watercraft that can operate underwater. ... The Jetfoil Toppi is a ferry which connects Yakushima, Tanegashima Island and Kagoshima port in Japan A hydrofoil is a boat with wing-like foils mounted on struts below the hull. ... Pressure (symbol: p) is the force per unit area acting on a surface in a direction perpendicular to that surface. ... ...

Cavitating propeller model

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Methods

Because it is a high-speed phenomenon, a special procedure is needed to visualize cavitation. The propeller, attached to a dynamometer, is placed in the inflow, and its thrust and torque is measured at different ratios of propeller speed (number of revolutions) to inflow velocity. A stroboscope synchronized with the propeller speed "freezes" the the cavitation bubble. By this, one can observe if the propeller would be damaged by cavitation. To ensure similarity to the full-scale propeller, the pressure is lowered, and the gas content of the water is controlled. For the dynamometer used in railroading, see dynamometer car A dynamometer or dyno for short is a device used to measure power and torque produced by an engine or other rotating device. ... A stroboscope , also known as a strobe, is an instrument used to make a cyclically moving object appear to be slow-moving or stationary. ... Several equivalence relations in mathematics are called similarity. ...

Often, a tunnel will be co-located with other experimental facilities at a Ship model basin. A ship model basin may be either a physical basin or tank used to carry out hydrodynamic tests with ship models, or the organization (often a company) that owns and operates such a facility. ...

List of Cavitation Tunnels (Water Tunnels):

FRANCE:

• "Tunnel de Cavitation" Ecole Navale [1], Lanveoc
• "Grand Tunnel Hydrodynamique" Bassin d'Essais des Carènes [2], Val de Reuil