Surface Protection Against Cavitation Erosion

Simple SummaryContent extracted from patent full text and abstract with AI.

This invention presents a coating-free method for protecting surfaces subjected to cavitation erosion, such as those found in ship rudders, pumps, and turbines. The technique consists of engineering a pattern of microcavities—specifically reentrant or double-reentrant (T-shaped or mushroom-shaped) cavities—on the surface. These microstructures trap air or gas, which expands during cavitation events to form a protective gas cushion that deflects damaging fluid jets away from the surface, thereby significantly reducing erosion without the use of wear-prone or environmentally harmful coatings.

Use CasesContent extracted from patent full text and abstract with AI.

• Ship rudders, hulls, and propellers to prevent cavitation-induced wear and corrosion
• Components of pumps and turbines exposed to high-velocity fluid flows
• Flow bends in piping systems subject to frequent cavitation events
• Power generation equipment, such as those in thermoelectric plants
• Marine transportation systems, including underwater vehicles and ferries
• Parts for neutron spallation sources or scientific instrumentation involving liquid flow under low-pressure conditions
• General fluid handling equipment (e.g., water jet nozzles, valves) where cavitation erosion is a concern

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly increases surface longevity by reducing or preventing cavitation erosion
• Eliminates the need for chemical coatings, mitigating environmental and health risks
• Applicable to a wide range of materials, including metals, plastics, composites, and glass
• Maintains effectiveness under mechanical and thermal stress—unlike many chemical coatings
• Inspired by robust natural strategies, leading to a durable and biomimetic design
• Reduces equipment downtime and maintenance costs
• Improves operational reliability in critical fluid-flow applications
• Potential for integration with standard microfabrication or additive manufacturing processes

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The present invention relates to a method for protecting surfaces of components against cavitation erosion and components provided with such cavitation protection surfaces, wherein in the surface a plurality of microcavities is provided which entrap gas such as air; the gas, air, entrapped inside the microcavities expands in the vicinity of cavitation bubbles, forming a gas cushion layer that directs cavitation jets away from the surface, thereby protecting the surface against cavitation erosion; the cavitation having a reentrant or double reentrant inlet design with typical T-shape and T-shape profile