Improved hydrofoil device

A component and hydrodynamic technology, applied to ship components, using hydrofoils to act on the surrounding water surface to reduce ship motion, rotary propellers, etc., can solve problems such as poor component efficiency, low pressure in the separation area, and complexity
CN1121331CInactive Publication Date: 2003-09-17VEEM工程集团有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
VEEM工程集团有限公司
Publication Date
2003-09-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A hydrofoil device is useable as a hydrofoil wing, propeller blade, etc. In a water flow, a relatively lower pressure is generated on a second surface (94) of the device compared with a first surface (96). Near the trailing end of the first surface a protrusion in the form of an adjustable interceptor (98) is provided. The face of this protrusion defines an included angle to the upstream direction of less than or equal to 90° so that water flow thereat is deflected back on itself thereby increasing the local pressure on the first surface. A second protrusion may be provided near the leading edge of the second surface (94) to encourage flow separation thereat. Air may be provided adjacent each protrusion to provide natural ventilation if the pressure of the water flow drops below atmospheric pressure.
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Description

technical field

[0001] The present invention relates to an improved hydrofoil device such that lift is primarily generated by a local pressure increase above the pressure of the local free stream or ambient pressure. The invention relates particularly, but not exclusively, to an improved hydrodynamic component for watercraft, such as control surfaces such as hydrofoils, blades, rudders, and seaplanes. Background technique

[0002] As used in this specification, the term "hydrodynamic component" refers to a physical structure designed to generate lift while passing through water; similarly, the term "aerodynamic component" refers to a similar structure in air. Hydrodynamic components can be used as dynamic supports, such as wings, control surfaces such as rudders, propellers, pumps and propellers such as water turbines. However, the principles behind hydrofoils are similar across applications.

[0003] Similar to aerodynamics, hydrodynamics create lift by changing the veloc...

Claims

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