Cavitation Damage Predicting Capability - State of Art and Possibilities,
Abstract
New results from cavitating venturi water tests are used to reinforce the concept of 'cavitation erosion efficiency', previously developed here from tests in a vibratory facility with both water and sodium. This concept emerges from a technique herein described to allow a priori prediction of eventual cavitation erosion rates in flowing machines. Bubble collapse pulse height spectra obtained from submerged microprobes are correlated with measured erosion rates in given laboratory and/or field devices to allow this prediction. Preliminary results from such correlations, along with other measurements of the effects of gas content, velocity, and cavitation condition upon 'mechanical' cavitation intensity as measured by the pulse height spectra, are here presented. New results from vibratory facility tests in tap water and synthetic sea water upon three materials of variable corrodibility (304 SS, 1018 carbon steel, and 1100-0 aluminum) are also presented. The ratio between maximum erosion rates for the salt and fresh water tests are found to increase toward unity as the mechanical cavitation intensity is increased, i.e., increased MDPR. This is expected on theoretical grounds. Finally, the relation between incubation period and maximum MDPR is examined from the vibratory test results, and found to depend upon the material properties as well as the fluid-flow conditions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1977
- Accession Number
- ADA047484
Entities
People
- F. G. Hammitt
- M. K. De
Organizations
- University of Michigan