Publication

Vibratory characteristics of erosive cavitation vortices downstream of a fixed leading edge cavity

François Avellan
1990
Conference Papers

Abstract

To identify the distinctive vibratory characteristics of erosive cavitation an investigation program was conducted in the IMHEF High Speed Cavitation Tunnel on a NACA 009 stainlcs~: steel profile equipped with 7 DECER electrochemical cavitation erosion detcctors and high frequency vibration sensors. Forces acting on the profile were inferred from a measured transmissibility function. Above a low threshold value a linear relationship was found between the measured mean square value of acceleration and the average erosion rate on the profile. Erosion vortices were found to be shed away from the main leading edge cavity according to a constant Strouhal number law. Their hydrodynamic erosive intensity of a power dimension, proportional to V^(3/2), is defined. This intensity is linearly related to the measured RMS force and average erosion on the profile for a given set of incidence and sigma values. The erosive efficiency of the cavitating flow however decreases with sigma.

Official source

https://infoscience.epfl.ch/entities/publication/99ab0d65-79b0-4626-871e-a24a1dd86fe5

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François Avellan
1990
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/99ab0d65-79b0-4626-871e-a24a1dd86fe5

About this result

Related concepts (32)

Erosion

Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust and then transports it to another location where it is deposited. Erosion is distinct from weathering which involves no movement. Removal of rock or soil as clastic sediment is referred to as physical or mechanical erosion; this contrasts with chemical erosion, where soil or rock material is removed from an area by dissolution.

Linear model

In statistics, the term linear model is used in different ways according to the context. The most common occurrence is in connection with regression models and the term is often taken as synonymous with linear regression model. However, the term is also used in time series analysis with a different meaning. In each case, the designation "linear" is used to identify a subclass of models for which substantial reduction in the complexity of the related statistical theory is possible.

Soil erosion

Soil erosion is the denudation or wearing away of the upper layer of soil. It is a form of soil degradation. This natural process is caused by the dynamic activity of erosive agents, that is, water, ice (glaciers), snow, air (wind), plants, and animals (including humans). In accordance with these agents, erosion is sometimes divided into water erosion, glacial erosion, snow erosion, wind (aeolean) erosion, zoogenic erosion and anthropogenic erosion such as tillage erosion.

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Vibratory characteristics of erosive cavitation vortices downstream of a fixed leading edge cavity

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